Directed synthesis, structure and properties of multifunctional materials

Link to this page

info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172057/RS//

Directed synthesis, structure and properties of multifunctional materials (en)
Усмерена синтеза, структура и својства мултифункционалних материјала (sr)
Usmerena sinteza, struktura i svojstva multifunkcionalnih materijala (sr_RS)
Authors

Publications

The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers

Mitić, Vojislav V.; Lazović, Goran; Lu, Chun-An; Paunović, Vesna; Radović, Ivana; Stajčić, Aleksandar; Vlahović, Branislav

(Basel : MDPI, 2020)

TY  - JOUR
AU  - Mitić, Vojislav V.
AU  - Lazović, Goran
AU  - Lu, Chun-An
AU  - Paunović, Vesna
AU  - Radović, Ivana
AU  - Stajčić, Aleksandar
AU  - Vlahović, Branislav
PY  - 2020
UR  - http://dais.sanu.ac.rs/123456789/8957
AB  - The BaTiO3 ceramics applications based on electronic properties have very high gradient scientific and industrial-technological interests. Our scientific research has been based on nano BaTiO3 modified with Yttrium based organometallic salt (MOD-Y). The samples have been consolidated at a sintering temperature of 1350 °C. Within the study, the new frontiers for different electronic properties between the layers of BaTiO3 grains have been introduced. The research target was grain boundary investigations and the influence on dielectric properties. After scanning electron microscopy and dielectric measurements, it has been established that modified BaTiO3 samples with larger grains showed a better compact state that led to a higher dielectric constant value. DC bias stability was also investigated and showed a connection between the grain size and capacitance stability. Analyses of functions that could approximate experimental curves were successfully employed. Practical application of fractal corrections was performed, based on surface (αs) and pore size (αp) corrections, which resulted in obtainment of the relation between the capacitance and Curie temperature. Successful introduction of fractal corrections for capacitance-Curie temperature dependence for a set of experimental data is an important step towards further miniaturization of intergranular capacitors. © 2020 by the authors.
PB  - Basel : MDPI
T2  - Applied Sciences (Switzerland)
T1  - The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers
SP  - 3485
VL  - 10
IS  - 10
DO  - 10.3390/app10103485
UR  - https://hdl.handle.net/21.15107/rcub_dais_8957
ER  - 
@article{
author = "Mitić, Vojislav V. and Lazović, Goran and Lu, Chun-An and Paunović, Vesna and Radović, Ivana and Stajčić, Aleksandar and Vlahović, Branislav",
year = "2020",
abstract = "The BaTiO3 ceramics applications based on electronic properties have very high gradient scientific and industrial-technological interests. Our scientific research has been based on nano BaTiO3 modified with Yttrium based organometallic salt (MOD-Y). The samples have been consolidated at a sintering temperature of 1350 °C. Within the study, the new frontiers for different electronic properties between the layers of BaTiO3 grains have been introduced. The research target was grain boundary investigations and the influence on dielectric properties. After scanning electron microscopy and dielectric measurements, it has been established that modified BaTiO3 samples with larger grains showed a better compact state that led to a higher dielectric constant value. DC bias stability was also investigated and showed a connection between the grain size and capacitance stability. Analyses of functions that could approximate experimental curves were successfully employed. Practical application of fractal corrections was performed, based on surface (αs) and pore size (αp) corrections, which resulted in obtainment of the relation between the capacitance and Curie temperature. Successful introduction of fractal corrections for capacitance-Curie temperature dependence for a set of experimental data is an important step towards further miniaturization of intergranular capacitors. © 2020 by the authors.",
publisher = "Basel : MDPI",
journal = "Applied Sciences (Switzerland)",
title = "The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers",
pages = "3485",
volume = "10",
number = "10",
doi = "10.3390/app10103485",
url = "https://hdl.handle.net/21.15107/rcub_dais_8957"
}
Mitić, V. V., Lazović, G., Lu, C., Paunović, V., Radović, I., Stajčić, A.,& Vlahović, B.. (2020). The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers. in Applied Sciences (Switzerland)
Basel : MDPI., 10(10), 3485.
https://doi.org/10.3390/app10103485
https://hdl.handle.net/21.15107/rcub_dais_8957
Mitić VV, Lazović G, Lu C, Paunović V, Radović I, Stajčić A, Vlahović B. The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers. in Applied Sciences (Switzerland). 2020;10(10):3485.
doi:10.3390/app10103485
https://hdl.handle.net/21.15107/rcub_dais_8957 .
Mitić, Vojislav V., Lazović, Goran, Lu, Chun-An, Paunović, Vesna, Radović, Ivana, Stajčić, Aleksandar, Vlahović, Branislav, "The Nano-Scale Modified BaTiO3 Morphology Influence on Electronic Properties and Ceramics Fractal Nature Frontiers" in Applied Sciences (Switzerland), 10, no. 10 (2020):3485,
https://doi.org/10.3390/app10103485 .,
https://hdl.handle.net/21.15107/rcub_dais_8957 .
1
1
1

Analyses of the surface parameters in polycrystalline diamonds

Veljković, Sandra; Mitić, Vojislav V.; Paunović, Vesna; Lazović, Goran; Mohr, Markus; Fecht, Hans

(Čačak : University of Kragujevac, Faculty of Technical Sciences, 2020)

TY  - JOUR
AU  - Veljković, Sandra
AU  - Mitić, Vojislav V.
AU  - Paunović, Vesna
AU  - Lazović, Goran
AU  - Mohr, Markus
AU  - Fecht, Hans
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10046
AB  - There is a progressing interests for polycrystalline diamonds and they have been more extensively used recently. This area has been intensively researched due to the outstanding potential of this material, and this necessitated presenting some of the latest application related to engineering in this paper. A better insight of polycrystalline diamonds properties can be achieved by intensively researching the surface structure. Samples of nanocrystalline diamonds grown by the chemical vapor deposition method are analyzed and accordingly, the focus of the research was the surface parameters and their structure. It is observed that waviness and texture are unique for any direction, their values are almost the same for the chosen directions and they vary approximately from -0.2 nm to 0.4 nm. Analyses of the parameters allowed a more detailed insight into the morphology of the surfaces of polycrystalline films.
PB  - Čačak : University of Kragujevac, Faculty of Technical Sciences
T2  - Serbian Journal of Electrical Engineering
T1  - Analyses of the surface parameters in polycrystalline diamonds
SP  - 111
EP  - 129
VL  - 17
IS  - 1
DO  - 10.2298/SJEE2001111V
UR  - https://hdl.handle.net/21.15107/rcub_dais_10046
ER  - 
@article{
author = "Veljković, Sandra and Mitić, Vojislav V. and Paunović, Vesna and Lazović, Goran and Mohr, Markus and Fecht, Hans",
year = "2020",
abstract = "There is a progressing interests for polycrystalline diamonds and they have been more extensively used recently. This area has been intensively researched due to the outstanding potential of this material, and this necessitated presenting some of the latest application related to engineering in this paper. A better insight of polycrystalline diamonds properties can be achieved by intensively researching the surface structure. Samples of nanocrystalline diamonds grown by the chemical vapor deposition method are analyzed and accordingly, the focus of the research was the surface parameters and their structure. It is observed that waviness and texture are unique for any direction, their values are almost the same for the chosen directions and they vary approximately from -0.2 nm to 0.4 nm. Analyses of the parameters allowed a more detailed insight into the morphology of the surfaces of polycrystalline films.",
publisher = "Čačak : University of Kragujevac, Faculty of Technical Sciences",
journal = "Serbian Journal of Electrical Engineering",
title = "Analyses of the surface parameters in polycrystalline diamonds",
pages = "111-129",
volume = "17",
number = "1",
doi = "10.2298/SJEE2001111V",
url = "https://hdl.handle.net/21.15107/rcub_dais_10046"
}
Veljković, S., Mitić, V. V., Paunović, V., Lazović, G., Mohr, M.,& Fecht, H.. (2020). Analyses of the surface parameters in polycrystalline diamonds. in Serbian Journal of Electrical Engineering
Čačak : University of Kragujevac, Faculty of Technical Sciences., 17(1), 111-129.
https://doi.org/10.2298/SJEE2001111V
https://hdl.handle.net/21.15107/rcub_dais_10046
Veljković S, Mitić VV, Paunović V, Lazović G, Mohr M, Fecht H. Analyses of the surface parameters in polycrystalline diamonds. in Serbian Journal of Electrical Engineering. 2020;17(1):111-129.
doi:10.2298/SJEE2001111V
https://hdl.handle.net/21.15107/rcub_dais_10046 .
Veljković, Sandra, Mitić, Vojislav V., Paunović, Vesna, Lazović, Goran, Mohr, Markus, Fecht, Hans, "Analyses of the surface parameters in polycrystalline diamonds" in Serbian Journal of Electrical Engineering, 17, no. 1 (2020):111-129,
https://doi.org/10.2298/SJEE2001111V .,
https://hdl.handle.net/21.15107/rcub_dais_10046 .

Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Savić, Slobodan; Đorđević, Antonije; Pavlović, Vladimir B.

(Springer, 2020)

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Savić, Slobodan
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10027
AB  - Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics
SP  - 95
EP  - 107
VL  - 140
DO  - 10.1007/s10973-019-08846-w
UR  - https://hdl.handle.net/21.15107/rcub_dais_10027
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Savić, Slobodan and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2020",
abstract = "Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics",
pages = "95-107",
volume = "140",
doi = "10.1007/s10973-019-08846-w",
url = "https://hdl.handle.net/21.15107/rcub_dais_10027"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Savić, S., Đorđević, A.,& Pavlović, V. B.. (2020). Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 140, 95-107.
https://doi.org/10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_10027
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Savić S, Đorđević A, Pavlović VB. Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry. 2020;140:95-107.
doi:10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_10027 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Savić, Slobodan, Đorđević, Antonije, Pavlović, Vladimir B., "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics" in Journal of Thermal Analysis and Calorimetry, 140 (2020):95-107,
https://doi.org/10.1007/s10973-019-08846-w .,
https://hdl.handle.net/21.15107/rcub_dais_10027 .
1
2
2

Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Savić, Slobodan; Đorđević, Antonije; Pavlović, Vladimir B.

(Springer, 2020)

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Savić, Slobodan
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - http://dais.sanu.ac.rs/123456789/6910
AB  - Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics
SP  - 95
EP  - 107
VL  - 140
DO  - 10.1007/s10973-019-08846-w
UR  - https://hdl.handle.net/21.15107/rcub_dais_6910
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Savić, Slobodan and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2020",
abstract = "Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics",
pages = "95-107",
volume = "140",
doi = "10.1007/s10973-019-08846-w",
url = "https://hdl.handle.net/21.15107/rcub_dais_6910"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Savić, S., Đorđević, A.,& Pavlović, V. B.. (2020). Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 140, 95-107.
https://doi.org/10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_6910
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Savić S, Đorđević A, Pavlović VB. Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry. 2020;140:95-107.
doi:10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_6910 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Savić, Slobodan, Đorđević, Antonije, Pavlović, Vladimir B., "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics" in Journal of Thermal Analysis and Calorimetry, 140 (2020):95-107,
https://doi.org/10.1007/s10973-019-08846-w .,
https://hdl.handle.net/21.15107/rcub_dais_6910 .
1
2
2

Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles

Anđelković, Ljubica; Jeremić, Dejan; Milenković, Milica R.; Radosavljević, Jelena; Vulić, Predrag; Pavlović, Vladimir B.; Manojlović, Dragan D.; Nikolić, Aleksandar S.

(Elsevier, 2020)

TY  - JOUR
AU  - Anđelković, Ljubica
AU  - Jeremić, Dejan
AU  - Milenković, Milica R.
AU  - Radosavljević, Jelena
AU  - Vulić, Predrag
AU  - Pavlović, Vladimir B.
AU  - Manojlović, Dragan D.
AU  - Nikolić, Aleksandar S.
PY  - 2020
UR  - http://dais.sanu.ac.rs/123456789/6901
AB  - A simple organic-phase synthesis process was used to produce bare NiFe2O4 and ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 ferrite nanoparticles. X-ray powder diffractograms for all investigated powders show characteristic peaks of a spinel cubic structure without a secondary phase. Transmission electron microscopy (TEM) indicated the presence of nanoparticles that are smaller than 20 nm. The release of divalent ions (Ni2+ and Zn2+) from synthesized nanoparticles that were dispersed in saline solution, phosphate-buffered saline (PBS) and human serum, as determined by the inductively coupled plasma mass spectrometry (ICP-MS) method, was lower than 2 wt %. These results demonstrate the stability of the investigated nanoparticles in biologically relevant media and exclude the toxicity of Ni2+ and Zn2+ due to metal ion release, thereby opening a broad range of (bio)medical applications.
PB  - Elsevier
T2  - Ceramics International
T1  - Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles
SP  - 3528
EP  - 3533
VL  - 46
IS  - 3
DO  - 10.1016/j.ceramint.2019.10.068
UR  - https://hdl.handle.net/21.15107/rcub_dais_6901
ER  - 
@article{
author = "Anđelković, Ljubica and Jeremić, Dejan and Milenković, Milica R. and Radosavljević, Jelena and Vulić, Predrag and Pavlović, Vladimir B. and Manojlović, Dragan D. and Nikolić, Aleksandar S.",
year = "2020",
abstract = "A simple organic-phase synthesis process was used to produce bare NiFe2O4 and ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 ferrite nanoparticles. X-ray powder diffractograms for all investigated powders show characteristic peaks of a spinel cubic structure without a secondary phase. Transmission electron microscopy (TEM) indicated the presence of nanoparticles that are smaller than 20 nm. The release of divalent ions (Ni2+ and Zn2+) from synthesized nanoparticles that were dispersed in saline solution, phosphate-buffered saline (PBS) and human serum, as determined by the inductively coupled plasma mass spectrometry (ICP-MS) method, was lower than 2 wt %. These results demonstrate the stability of the investigated nanoparticles in biologically relevant media and exclude the toxicity of Ni2+ and Zn2+ due to metal ion release, thereby opening a broad range of (bio)medical applications.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles",
pages = "3528-3533",
volume = "46",
number = "3",
doi = "10.1016/j.ceramint.2019.10.068",
url = "https://hdl.handle.net/21.15107/rcub_dais_6901"
}
Anđelković, L., Jeremić, D., Milenković, M. R., Radosavljević, J., Vulić, P., Pavlović, V. B., Manojlović, D. D.,& Nikolić, A. S.. (2020). Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles. in Ceramics International
Elsevier., 46(3), 3528-3533.
https://doi.org/10.1016/j.ceramint.2019.10.068
https://hdl.handle.net/21.15107/rcub_dais_6901
Anđelković L, Jeremić D, Milenković MR, Radosavljević J, Vulić P, Pavlović VB, Manojlović DD, Nikolić AS. Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles. in Ceramics International. 2020;46(3):3528-3533.
doi:10.1016/j.ceramint.2019.10.068
https://hdl.handle.net/21.15107/rcub_dais_6901 .
Anđelković, Ljubica, Jeremić, Dejan, Milenković, Milica R., Radosavljević, Jelena, Vulić, Predrag, Pavlović, Vladimir B., Manojlović, Dragan D., Nikolić, Aleksandar S., "Synthesis, characterization and in vitro evaluation of divalent ion release from stable NiFe2O4, ZnFe2O4 and core-shell ZnFe2O4@NiFe2O4 nanoparticles" in Ceramics International, 46, no. 3 (2020):3528-3533,
https://doi.org/10.1016/j.ceramint.2019.10.068 .,
https://hdl.handle.net/21.15107/rcub_dais_6901 .
6
4
6

Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661

Ristić, Predrag; Blagojević, Vladimir A.; Janjić, Goran V.; Rodić, Marko; Vulić, Predrag J.; Donnard, Morgan; Gulea, Mihaela; Chylewska, Agnieszka; Makowski, Mariusz; Todorović, Tamara; Filipović, Nenad R.

(American Chemical Society, 2020)

TY  - DATA
AU  - Ristić, Predrag
AU  - Blagojević, Vladimir A.
AU  - Janjić, Goran V.
AU  - Rodić, Marko
AU  - Vulić, Predrag J.
AU  - Donnard, Morgan
AU  - Gulea, Mihaela
AU  - Chylewska, Agnieszka
AU  - Makowski, Mariusz
AU  - Todorović, Tamara
AU  - Filipović, Nenad R.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/9455
AB  - Figure S1.IR spectra of gaseous decomposition products obtained during TGexperiments with 1(A) and 2(B);Figure S2.The 3D presentation of thermal decompositions versustime together with IR spectra of their gaseous products: (a)1; (b)2; Figure S3. Overlapped experimental (blue) and calculated (red) powder XRD diffractograms of 1 (A) and 2 (B); Figure S4.Comparison between experimental powder XRD patterns of 1(left) and 2(right) with simulated  patterns  of  their  analogues  with  different positionof M‒Sbondwith  respect  to  the TM-CN ring chair conformation; Figure S5. Optical microscope images of Pt-(left) and Pd-complex (right)showing as-obtained single crystals; Figure S6.SEM images of Pt-(left) and Pd-complex (right)after reduction to powder for XRD measurements; Figure S7. 1H NMR spectra of TM-CN in DMSO-d6(A) and CD3NO2(B); Figure S8. 13CNMR spectra of TM-CN in DMSO-d6(A) and CD3NO2(B); Figure S9. 1H (A) and 13CNMR (B) spectra of 1in DMSO-d6; Figure S10. COSY spectrum of 1in DMSO-d6; Figure S11. NOESY spectrum of 1in DMSO-d6; Figure S12. 1H–13CHSQC spectrum of 1in DMSO-d6, Figure S13. 1H (A) and 13CNMR (B) spectra of 1in CD3NO2; Figure S14. 1H (A) and 13CNMR (B) spectra of 2in DMSO-d6; Figure S15. 1H (A) and 13CNMR (B) spectra of 2in CD3NO2; Scheme S1. Labellingof atoms used for NMR signal assignments;
Table  S1.Experimental  vibrational  frequencies  (cm-1)  and  signals  description  of  complexes studied;Table S2.Crystal data and structure refinement for 1and 2; Table S3.Selected bond lengths (Å) and angles (°) for complexes 1 and 2;Table  S4. Results  of  energy  calculations  for  C-H/Cl-M,  C-H/S-M,  C-H/M  and C-H/NCinteractions  (M=  Pd(II)  and  Pt(II))  at wb97xd/6-31+g**  +lanl2dzlevel  of  theory.  Energies  are expressed in kcal/mol; Table  S5.C-H/M  interactions  obtained  from  the  periodic  calculations  of  axial  and  equatorially coordinated Pd and Pt; Table S6.1H NMR spectral data (399.74 MHz)in DMSO-d6and CD3NO2at 298 K for TM-CN and complexes 1and 2; Table S7. 13C NMR spectral data (100.53 MHz)in DMSO-d6and CD3NO2at 298 K for TM-CN and complexes 1and 2.
PB  - American Chemical Society
T2  - Crystal Growth & Design
T1  - Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661
UR  - https://hdl.handle.net/21.15107/rcub_dais_9455
ER  - 
@misc{
author = "Ristić, Predrag and Blagojević, Vladimir A. and Janjić, Goran V. and Rodić, Marko and Vulić, Predrag J. and Donnard, Morgan and Gulea, Mihaela and Chylewska, Agnieszka and Makowski, Mariusz and Todorović, Tamara and Filipović, Nenad R.",
year = "2020",
abstract = "Figure S1.IR spectra of gaseous decomposition products obtained during TGexperiments with 1(A) and 2(B);Figure S2.The 3D presentation of thermal decompositions versustime together with IR spectra of their gaseous products: (a)1; (b)2; Figure S3. Overlapped experimental (blue) and calculated (red) powder XRD diffractograms of 1 (A) and 2 (B); Figure S4.Comparison between experimental powder XRD patterns of 1(left) and 2(right) with simulated  patterns  of  their  analogues  with  different positionof M‒Sbondwith  respect  to  the TM-CN ring chair conformation; Figure S5. Optical microscope images of Pt-(left) and Pd-complex (right)showing as-obtained single crystals; Figure S6.SEM images of Pt-(left) and Pd-complex (right)after reduction to powder for XRD measurements; Figure S7. 1H NMR spectra of TM-CN in DMSO-d6(A) and CD3NO2(B); Figure S8. 13CNMR spectra of TM-CN in DMSO-d6(A) and CD3NO2(B); Figure S9. 1H (A) and 13CNMR (B) spectra of 1in DMSO-d6; Figure S10. COSY spectrum of 1in DMSO-d6; Figure S11. NOESY spectrum of 1in DMSO-d6; Figure S12. 1H–13CHSQC spectrum of 1in DMSO-d6, Figure S13. 1H (A) and 13CNMR (B) spectra of 1in CD3NO2; Figure S14. 1H (A) and 13CNMR (B) spectra of 2in DMSO-d6; Figure S15. 1H (A) and 13CNMR (B) spectra of 2in CD3NO2; Scheme S1. Labellingof atoms used for NMR signal assignments;
Table  S1.Experimental  vibrational  frequencies  (cm-1)  and  signals  description  of  complexes studied;Table S2.Crystal data and structure refinement for 1and 2; Table S3.Selected bond lengths (Å) and angles (°) for complexes 1 and 2;Table  S4. Results  of  energy  calculations  for  C-H/Cl-M,  C-H/S-M,  C-H/M  and C-H/NCinteractions  (M=  Pd(II)  and  Pt(II))  at wb97xd/6-31+g**  +lanl2dzlevel  of  theory.  Energies  are expressed in kcal/mol; Table  S5.C-H/M  interactions  obtained  from  the  periodic  calculations  of  axial  and  equatorially coordinated Pd and Pt; Table S6.1H NMR spectral data (399.74 MHz)in DMSO-d6and CD3NO2at 298 K for TM-CN and complexes 1and 2; Table S7. 13C NMR spectral data (100.53 MHz)in DMSO-d6and CD3NO2at 298 K for TM-CN and complexes 1and 2.",
publisher = "American Chemical Society",
journal = "Crystal Growth & Design",
title = "Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661",
url = "https://hdl.handle.net/21.15107/rcub_dais_9455"
}
Ristić, P., Blagojević, V. A., Janjić, G. V., Rodić, M., Vulić, P. J., Donnard, M., Gulea, M., Chylewska, A., Makowski, M., Todorović, T.,& Filipović, N. R.. (2020). Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661. in Crystal Growth & Design
American Chemical Society..
https://hdl.handle.net/21.15107/rcub_dais_9455
Ristić P, Blagojević VA, Janjić GV, Rodić M, Vulić PJ, Donnard M, Gulea M, Chylewska A, Makowski M, Todorović T, Filipović NR. Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661. in Crystal Growth & Design. 2020;.
https://hdl.handle.net/21.15107/rcub_dais_9455 .
Ristić, Predrag, Blagojević, Vladimir A., Janjić, Goran V., Rodić, Marko, Vulić, Predrag J., Donnard, Morgan, Gulea, Mihaela, Chylewska, Agnieszka, Makowski, Mariusz, Todorović, Tamara, Filipović, Nenad R., "Supplementary data for the article: Ristić, P.; Blagojević, V.; Janjić, G.; Rodić, M.; Vulić, P.; Donnard, M.; Gulea, M.; Chylewska, A.; Makowski, M.; Todorović, T.; Filipović, N. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-Carbonitrile: Crystallographic, Thermal, and DFT Study. Crystal Growth & Design 2020, 20 (5), 3018–3033. https://doi.org/10.1021/acs.cgd.9b01661" in Crystal Growth & Design (2020),
https://hdl.handle.net/21.15107/rcub_dais_9455 .

Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata

Vujančević, Jelena

(Универзитет у Београду, Технолошко-металуршки факултет, 2020)

TY  - THES
AU  - Vujančević, Jelena
PY  - 2020
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=8054
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:23509/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=35998985
UR  - https://nardus.mpn.gov.rs/handle/123456789/18222
UR  - https://dais.sanu.ac.rs/123456789/11714
AB  - Ekološki izvori energije i ekonomične metode prečišćavanja vode i vazduha velika supotreba današnjeg tehnološki razvijenog sveta. Fotoaktivni materijali mogu da obezbede ekološkualternativu fosilnim gorivima kada je u pitanju proizvodnja energije i omoguće saniranje nastalihpromena u životnoj sredini. Naime, fotoaktivni materijali apsorbuju svetlost i tada dolazi dopobuđivanja elektrona, koji su odgovorni za prenos električne struje ili učestvuju u procesurazgradnje zagađujućih materija. Postoji veliki broj fotoaktivnih materijala, među kojima se izdvajaTiO2, kojeg odlikuje hemijska inertnost, otpornost na fotoindukovanu i hemijsku koroziju inetoksičnost. Na fotoaktivnost TiO2 utiču mnogi faktori, kao što su morfologija, kristalna struktura istepen rekombinacije nosilaca naelektrisanja.Cilj ove doktorske disertacije je poboljšanje fotokatalitičke i fotoelektrične aktivnosti TiO2nanocevi. U tu svrhu, TiO2 nanocevi su sintetisane metodom elektrohemijske anodizacije pločicetitana. Ispitivan je uticaj procesnih parametara anodizacije na morfologiju i fotokatalitičku aktivnostnanocevi TiO2 u procesu razgradnje boje. Utvrđeno je da sa porastom napona anodizacije rastuvisina i prečnik nanocevi, što utiče na pomeraj apsorpcione granice ka vidljivom delu spektra i napoboljšanje fotokatalitičke aktivnosti. Određen je uticaj temperature žarenja na kristalnu strukturu,morfologiju i fotokatalitičku aktivnost TiO2 nanocevi. Žarenjem nanocevi na 450 °C dobijena jekristalna modifikacija anatasa sa veoma malim sadržajem faze rutila. Sa daljim porastomtemperature žarenja (600 i 650 °C) uočeno je prisustvo obe faze, anatasa i rutila, u različitimodnosima, a do kompletne transformacije anatasa u rutil došlo je na 700 °C. Pored promenekristalne strukture, uočen je uticaj temperature žarenja na morfologiju nanocevi. Sa povišenjemtemperature žarenja, visina nanocevi se smanjivala, kao i poroznost nanocevi, da bi na 700 °C došlodo kolapsa nanocevne morfologije. Sagledan je uticaj kristalne strukture i morfologije TiO2nanocevi na fotokatalitičku razgradnju boje metil-oranž. Zaključeno je da istovremeno prisustvoanatasa i rutila obezbeđuje bolju fotokatalitičku aktivnost u odnosu na čist anatas i čist rutil.Kako bi se ispitao uticaj dopiranja TiO2 azotom na fotokatalitičku aktivnost, nanocevi TiO2su žarene u atmosferi amonijaka, na temperaturi od 450 °C, pri različitim dužinama žarenja.Ispitivan je uticaj vremena žarenja na količinu i vrstu dopiranja. Uočeno je da žarenje u atmosferiamonijaka, pri različitim vremenima, nije uticalo na morfologiju nanocevi. Hemijska analizapovršine TiO2 nanocevi rendgenskom fotoelektronskom spektroskopijom pokazala je da sa dužimvremenom žarenja opada ukupan sadržaj azota u nanocevima. Osim toga, dužina žarenja uamonijaku je uticala i na prirodu inkorporiranja azota u TiO2. Pri kraćem vremenu žarenja zapaženje veći sadržaj intersticijskog azota, a manji sadržaj supstitucijskog azota. S dužim vremenomžarenja u amonijaku, sadržaj intersticijskog azota opada, dok sadržaj supstitucijskog raste.Apsorpcioni spektri su pokazali da uzorak sa najvećom količinom azota i najvećim sadržajemintersticijskog azota pokazuje najveći pomeraj granice apsorpcije ka većim talasnim dužinama. Istoje uočeno i za fotokatalitičku efikasnost. Najveću fotokatalitičku razgradnju boje postigao je uzorakžaren u amonijaku pri najkraćem vremenu.Dalje istraživanje je išlo u smeru proširenja saznanja o pojedinačnim i kombinovanimuticajima dopiranja azotom i deponovanja kvatnih tačaka neorganskog senzivatora nafotokatalitičku aktivnost TiO2 nanocevi. Zapaženo je da deponovanje kvantnih tačaka CdS nijeuticalo na morfologiju nanocevi, ali je na pojedinim mestima došlo do aglomeracije CdSnanočestica, što je dovelo do zatvaranja otvora nanocevi. Utvrđeno je da je fotokatalitičkaefikasnost azotom dopiranih nanocevi poboljšana nakon deponovanja CdS nanočestica. Najvećufotokatlitiču efikasnost pokazao je uzorak sa najvećim sadržajem ukupnog azota i intersticijskogazota u kombinaciji sa deponovanim CdS nanočesticama...
AB  - Environmental friendly power sources and cost-effective methods for water and airpurification, are a necessity in modern technologically developed world. Photoactive materials canprovide an environmentally friendly alternative to fossil fuels in power production and enable theremediation of changes in the environment. Namely, photoactive materials absorb light, whichexcites electrons that are responsible for generating electricity or participate in the process ofdecomposition of pollutants. There are a large number of photoactive materials, among which TiO2has attracted particular attention, due to its chemical inertness, resistance to photo and chemicalcorrosion and non-toxicity. The photoactivity of TiO2 depends on many factors, such asmorphology, crystal structure and the degree of recombination of charge carriers.The aim of this doctoral dissertation is to improve the photocatalytic and photoelectricactivity of TiO2 nanotubes. For this purpose, TiO2 nanotubes were synthesized by theelectrochemical anodization of a titanium plate. The influence of the anodization process parameterson the morphology and photocatalytic activity of TiO2 nanotubes for color degradation wasinvestigated. It was found that an increased anodization voltage leads to increased heights anddiameters of nanotubes, causing the shift of the absorption limit towards the visible part of thespectrum and the improvement of the photocatalytic activity. The influence of the annealingtemperature on the crystal structure, morphology and the photocatalytic activity of TiO2 nanotubeswas determined. The anatase crystalline modification with a very low rutile phase content wasobtained by annealing nanotubes at 450 °C. When the annealing temperature was further increased(600 and 650 °C), the presence of both phases, anatase and rutile, was observed in different ratios,and the complete transformation of anatase to rutile occurred at 700 °C. Besides the change in thecrystal structure, the influence of the annealing temperature on the morphology of the nanotubeswas observed as well. As the annealing temperature increased, the height and porosity of nanotubesdecreased, so that the nanotube morphology collapsed at 700 °C. The influence of the crystalstructure and morphology of TiO2 nanotubes on the photocatalytic degradation of methyl-orangewas observed. It was concluded that the simultaneous presence of anatase and rutile provides betterphotocatalytic activity than pure anatase and pure rutile.In order to investigate the effect of nitrogen doping of TiO2 on photocatalytic activity, TiO2nanotubes were annealed in an ammonia atmosphere, at a temperature of 450 °C, for differentannealing times. The influence of the annealing time on the amount and type of doping wasinvestigated. It was observed that annealing in an ammonia atmosphere, for different periods, didnot affect the morphology of nanotubes. A chemical analysis of the surface of TiO2 nanotubes by Xray photoelectron spectroscopy showed that the total nitrogen content in nanotubes decreased withlonger annealing times. In addition, the annealing duration in ammonia also influenced the nature ofnitrogen incorporation into TiO2. With a shorter annealing time, a higher content of interstitialnitrogen and a lower amount of substitution nitrogen were observed. With a longer annealing timein ammonia, the amount of interstitial nitrogen decreased, while the substitution nitrogen increased.The absorption spectra showed that the sample with the highest amount of nitrogen and the highestcontent of interstitial nitrogen showed the largest shift towards higher wavelengths. The sameapplies to the photocatalytic efficiency. The greatest photocatalytic degradation of the dye wasachieved in the sample annealed in ammonia for the shortest time.Further research was directed towards expanding the knowledge of individual and combinedeffects of nitrogen doping and deposition of the quantum dots of inorganic sensors on thephotocatalytic activity of TiO2 nanotubes. It was observed that the deposition of CdS quantum dotsdid not affect the morphology of nanotubes, but in some places agglomeration of CdS nanoparticlesoccurred, due to which nanotube openings closed. The photocatalytic efficiency of nitrogen-dopednanotubes was improved after CdS nanoparticle deposition. The sample with the highest amount oftotal nitrogen and interstitial nitrogen in combination with deposited CdS nanoparticles exhibitedthe highest photocatalytic efficiency...
PB  - Универзитет у Београду, Технолошко-металуршки факултет
T1  - Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata
UR  - https://hdl.handle.net/21.15107/rcub_nardus_18222
ER  - 
@phdthesis{
author = "Vujančević, Jelena",
year = "2020",
abstract = "Ekološki izvori energije i ekonomične metode prečišćavanja vode i vazduha velika supotreba današnjeg tehnološki razvijenog sveta. Fotoaktivni materijali mogu da obezbede ekološkualternativu fosilnim gorivima kada je u pitanju proizvodnja energije i omoguće saniranje nastalihpromena u životnoj sredini. Naime, fotoaktivni materijali apsorbuju svetlost i tada dolazi dopobuđivanja elektrona, koji su odgovorni za prenos električne struje ili učestvuju u procesurazgradnje zagađujućih materija. Postoji veliki broj fotoaktivnih materijala, među kojima se izdvajaTiO2, kojeg odlikuje hemijska inertnost, otpornost na fotoindukovanu i hemijsku koroziju inetoksičnost. Na fotoaktivnost TiO2 utiču mnogi faktori, kao što su morfologija, kristalna struktura istepen rekombinacije nosilaca naelektrisanja.Cilj ove doktorske disertacije je poboljšanje fotokatalitičke i fotoelektrične aktivnosti TiO2nanocevi. U tu svrhu, TiO2 nanocevi su sintetisane metodom elektrohemijske anodizacije pločicetitana. Ispitivan je uticaj procesnih parametara anodizacije na morfologiju i fotokatalitičku aktivnostnanocevi TiO2 u procesu razgradnje boje. Utvrđeno je da sa porastom napona anodizacije rastuvisina i prečnik nanocevi, što utiče na pomeraj apsorpcione granice ka vidljivom delu spektra i napoboljšanje fotokatalitičke aktivnosti. Određen je uticaj temperature žarenja na kristalnu strukturu,morfologiju i fotokatalitičku aktivnost TiO2 nanocevi. Žarenjem nanocevi na 450 °C dobijena jekristalna modifikacija anatasa sa veoma malim sadržajem faze rutila. Sa daljim porastomtemperature žarenja (600 i 650 °C) uočeno je prisustvo obe faze, anatasa i rutila, u različitimodnosima, a do kompletne transformacije anatasa u rutil došlo je na 700 °C. Pored promenekristalne strukture, uočen je uticaj temperature žarenja na morfologiju nanocevi. Sa povišenjemtemperature žarenja, visina nanocevi se smanjivala, kao i poroznost nanocevi, da bi na 700 °C došlodo kolapsa nanocevne morfologije. Sagledan je uticaj kristalne strukture i morfologije TiO2nanocevi na fotokatalitičku razgradnju boje metil-oranž. Zaključeno je da istovremeno prisustvoanatasa i rutila obezbeđuje bolju fotokatalitičku aktivnost u odnosu na čist anatas i čist rutil.Kako bi se ispitao uticaj dopiranja TiO2 azotom na fotokatalitičku aktivnost, nanocevi TiO2su žarene u atmosferi amonijaka, na temperaturi od 450 °C, pri različitim dužinama žarenja.Ispitivan je uticaj vremena žarenja na količinu i vrstu dopiranja. Uočeno je da žarenje u atmosferiamonijaka, pri različitim vremenima, nije uticalo na morfologiju nanocevi. Hemijska analizapovršine TiO2 nanocevi rendgenskom fotoelektronskom spektroskopijom pokazala je da sa dužimvremenom žarenja opada ukupan sadržaj azota u nanocevima. Osim toga, dužina žarenja uamonijaku je uticala i na prirodu inkorporiranja azota u TiO2. Pri kraćem vremenu žarenja zapaženje veći sadržaj intersticijskog azota, a manji sadržaj supstitucijskog azota. S dužim vremenomžarenja u amonijaku, sadržaj intersticijskog azota opada, dok sadržaj supstitucijskog raste.Apsorpcioni spektri su pokazali da uzorak sa najvećom količinom azota i najvećim sadržajemintersticijskog azota pokazuje najveći pomeraj granice apsorpcije ka većim talasnim dužinama. Istoje uočeno i za fotokatalitičku efikasnost. Najveću fotokatalitičku razgradnju boje postigao je uzorakžaren u amonijaku pri najkraćem vremenu.Dalje istraživanje je išlo u smeru proširenja saznanja o pojedinačnim i kombinovanimuticajima dopiranja azotom i deponovanja kvatnih tačaka neorganskog senzivatora nafotokatalitičku aktivnost TiO2 nanocevi. Zapaženo je da deponovanje kvantnih tačaka CdS nijeuticalo na morfologiju nanocevi, ali je na pojedinim mestima došlo do aglomeracije CdSnanočestica, što je dovelo do zatvaranja otvora nanocevi. Utvrđeno je da je fotokatalitičkaefikasnost azotom dopiranih nanocevi poboljšana nakon deponovanja CdS nanočestica. Najvećufotokatlitiču efikasnost pokazao je uzorak sa najvećim sadržajem ukupnog azota i intersticijskogazota u kombinaciji sa deponovanim CdS nanočesticama..., Environmental friendly power sources and cost-effective methods for water and airpurification, are a necessity in modern technologically developed world. Photoactive materials canprovide an environmentally friendly alternative to fossil fuels in power production and enable theremediation of changes in the environment. Namely, photoactive materials absorb light, whichexcites electrons that are responsible for generating electricity or participate in the process ofdecomposition of pollutants. There are a large number of photoactive materials, among which TiO2has attracted particular attention, due to its chemical inertness, resistance to photo and chemicalcorrosion and non-toxicity. The photoactivity of TiO2 depends on many factors, such asmorphology, crystal structure and the degree of recombination of charge carriers.The aim of this doctoral dissertation is to improve the photocatalytic and photoelectricactivity of TiO2 nanotubes. For this purpose, TiO2 nanotubes were synthesized by theelectrochemical anodization of a titanium plate. The influence of the anodization process parameterson the morphology and photocatalytic activity of TiO2 nanotubes for color degradation wasinvestigated. It was found that an increased anodization voltage leads to increased heights anddiameters of nanotubes, causing the shift of the absorption limit towards the visible part of thespectrum and the improvement of the photocatalytic activity. The influence of the annealingtemperature on the crystal structure, morphology and the photocatalytic activity of TiO2 nanotubeswas determined. The anatase crystalline modification with a very low rutile phase content wasobtained by annealing nanotubes at 450 °C. When the annealing temperature was further increased(600 and 650 °C), the presence of both phases, anatase and rutile, was observed in different ratios,and the complete transformation of anatase to rutile occurred at 700 °C. Besides the change in thecrystal structure, the influence of the annealing temperature on the morphology of the nanotubeswas observed as well. As the annealing temperature increased, the height and porosity of nanotubesdecreased, so that the nanotube morphology collapsed at 700 °C. The influence of the crystalstructure and morphology of TiO2 nanotubes on the photocatalytic degradation of methyl-orangewas observed. It was concluded that the simultaneous presence of anatase and rutile provides betterphotocatalytic activity than pure anatase and pure rutile.In order to investigate the effect of nitrogen doping of TiO2 on photocatalytic activity, TiO2nanotubes were annealed in an ammonia atmosphere, at a temperature of 450 °C, for differentannealing times. The influence of the annealing time on the amount and type of doping wasinvestigated. It was observed that annealing in an ammonia atmosphere, for different periods, didnot affect the morphology of nanotubes. A chemical analysis of the surface of TiO2 nanotubes by Xray photoelectron spectroscopy showed that the total nitrogen content in nanotubes decreased withlonger annealing times. In addition, the annealing duration in ammonia also influenced the nature ofnitrogen incorporation into TiO2. With a shorter annealing time, a higher content of interstitialnitrogen and a lower amount of substitution nitrogen were observed. With a longer annealing timein ammonia, the amount of interstitial nitrogen decreased, while the substitution nitrogen increased.The absorption spectra showed that the sample with the highest amount of nitrogen and the highestcontent of interstitial nitrogen showed the largest shift towards higher wavelengths. The sameapplies to the photocatalytic efficiency. The greatest photocatalytic degradation of the dye wasachieved in the sample annealed in ammonia for the shortest time.Further research was directed towards expanding the knowledge of individual and combinedeffects of nitrogen doping and deposition of the quantum dots of inorganic sensors on thephotocatalytic activity of TiO2 nanotubes. It was observed that the deposition of CdS quantum dotsdid not affect the morphology of nanotubes, but in some places agglomeration of CdS nanoparticlesoccurred, due to which nanotube openings closed. The photocatalytic efficiency of nitrogen-dopednanotubes was improved after CdS nanoparticle deposition. The sample with the highest amount oftotal nitrogen and interstitial nitrogen in combination with deposited CdS nanoparticles exhibitedthe highest photocatalytic efficiency...",
publisher = "Универзитет у Београду, Технолошко-металуршки факултет",
title = "Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata",
url = "https://hdl.handle.net/21.15107/rcub_nardus_18222"
}
Vujančević, J.. (2020). Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata. 
Универзитет у Београду, Технолошко-металуршки факултет..
https://hdl.handle.net/21.15107/rcub_nardus_18222
Vujančević J. Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata. 2020;.
https://hdl.handle.net/21.15107/rcub_nardus_18222 .
Vujančević, Jelena, "Modifikovanje strukture i fotoaktivnosti nanocevi titan(IV)-oksida dopiranjem i primenom fotoosetljivih komponenata" (2020),
https://hdl.handle.net/21.15107/rcub_nardus_18222 .

Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study

Ristić, Predrag; Blagojević, Vladimir A.; Janjić, Goran V.; Rodić, Marko; Vulić, Predrag J.; Donnard, Morgan; Gulea, Mihaela; Chylewska, Agnieszka; Makowski, Mariusz; Todorović, Tamara; Filipović, Nenad R.

(American Chemical Society, 2020)

TY  - JOUR
AU  - Ristić, Predrag
AU  - Blagojević, Vladimir A.
AU  - Janjić, Goran V.
AU  - Rodić, Marko
AU  - Vulić, Predrag J.
AU  - Donnard, Morgan
AU  - Gulea, Mihaela
AU  - Chylewska, Agnieszka
AU  - Makowski, Mariusz
AU  - Todorović, Tamara
AU  - Filipović, Nenad R.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/9454
AB  - Pt(II) and Pd(II) complexes (1 and 2, respectively) with thiomorpholine-4-carbonitrile (TM-CN), an N-substituted thiomorpholine derivative, were synthesized from tetrachlorido precursors in water. Structural analysis has shown that 1 represents the first monomeric metal complex with this ligand type with an axial M-S bond with respect to the TM-CN ring chair conformation, while in 2 a typical equatorial M-S bond position with respect to the ring chair conformation was observed. A detailed DFT investigation revealed that axial conformers are more stable for molecular forms of both metals, while intermolecular interactions in the crystals stabilize the axial conformer for Pt(II) and the equatorial conformer for Pd(II). The magnitude of this stabilization in the case of 2 is large enough to change the most stable axial conformer in the molecular form to the equatorial conformer in the crystal. Further investigation of the strength of individual intermolecular interactions revealed significant differences of some interactions between the two structures. The likely cause of the difference in the crystal structures of experimentally obtained complexes is the fact that 1 and 2 exhibit different dominant interactions: C-H/M and C-H/S are more dominant in 1 and C-H/Cl interactions are more dominant in 2. In addition, DFT calculations have shown that while the axial position of the Pt-S bond with respect to the ring chair conformation results in a significantly shorter C-H/Pt interaction distance than that in the hypothetical equatorial conformer, there is very little difference in C-H/Pd interaction distances in conformers with axial and equatorial positions of Pd-S bond with respect to the ring chair conformation.
PB  - American Chemical Society
T2  - Crystal Growth & Design
T1  - Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study
SP  - 3018
EP  - 3033
VL  - 20
IS  - 5
DO  - 10.1021/acs.cgd.9b01661
UR  - https://hdl.handle.net/21.15107/rcub_dais_9454
ER  - 
@article{
author = "Ristić, Predrag and Blagojević, Vladimir A. and Janjić, Goran V. and Rodić, Marko and Vulić, Predrag J. and Donnard, Morgan and Gulea, Mihaela and Chylewska, Agnieszka and Makowski, Mariusz and Todorović, Tamara and Filipović, Nenad R.",
year = "2020",
abstract = "Pt(II) and Pd(II) complexes (1 and 2, respectively) with thiomorpholine-4-carbonitrile (TM-CN), an N-substituted thiomorpholine derivative, were synthesized from tetrachlorido precursors in water. Structural analysis has shown that 1 represents the first monomeric metal complex with this ligand type with an axial M-S bond with respect to the TM-CN ring chair conformation, while in 2 a typical equatorial M-S bond position with respect to the ring chair conformation was observed. A detailed DFT investigation revealed that axial conformers are more stable for molecular forms of both metals, while intermolecular interactions in the crystals stabilize the axial conformer for Pt(II) and the equatorial conformer for Pd(II). The magnitude of this stabilization in the case of 2 is large enough to change the most stable axial conformer in the molecular form to the equatorial conformer in the crystal. Further investigation of the strength of individual intermolecular interactions revealed significant differences of some interactions between the two structures. The likely cause of the difference in the crystal structures of experimentally obtained complexes is the fact that 1 and 2 exhibit different dominant interactions: C-H/M and C-H/S are more dominant in 1 and C-H/Cl interactions are more dominant in 2. In addition, DFT calculations have shown that while the axial position of the Pt-S bond with respect to the ring chair conformation results in a significantly shorter C-H/Pt interaction distance than that in the hypothetical equatorial conformer, there is very little difference in C-H/Pd interaction distances in conformers with axial and equatorial positions of Pd-S bond with respect to the ring chair conformation.",
publisher = "American Chemical Society",
journal = "Crystal Growth & Design",
title = "Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study",
pages = "3018-3033",
volume = "20",
number = "5",
doi = "10.1021/acs.cgd.9b01661",
url = "https://hdl.handle.net/21.15107/rcub_dais_9454"
}
Ristić, P., Blagojević, V. A., Janjić, G. V., Rodić, M., Vulić, P. J., Donnard, M., Gulea, M., Chylewska, A., Makowski, M., Todorović, T.,& Filipović, N. R.. (2020). Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study. in Crystal Growth & Design
American Chemical Society., 20(5), 3018-3033.
https://doi.org/10.1021/acs.cgd.9b01661
https://hdl.handle.net/21.15107/rcub_dais_9454
Ristić P, Blagojević VA, Janjić GV, Rodić M, Vulić PJ, Donnard M, Gulea M, Chylewska A, Makowski M, Todorović T, Filipović NR. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study. in Crystal Growth & Design. 2020;20(5):3018-3033.
doi:10.1021/acs.cgd.9b01661
https://hdl.handle.net/21.15107/rcub_dais_9454 .
Ristić, Predrag, Blagojević, Vladimir A., Janjić, Goran V., Rodić, Marko, Vulić, Predrag J., Donnard, Morgan, Gulea, Mihaela, Chylewska, Agnieszka, Makowski, Mariusz, Todorović, Tamara, Filipović, Nenad R., "Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study" in Crystal Growth & Design, 20, no. 5 (2020):3018-3033,
https://doi.org/10.1021/acs.cgd.9b01661 .,
https://hdl.handle.net/21.15107/rcub_dais_9454 .
1
3
3
3

Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study

Ristić, Predrag; Blagojević, Vladimir A.; Janjić, Goran V.; Rodić, Marko; Vulić, Predrag J.; Donnard, Morgan; Gulea, Mihaela; Chylewska, Agnieszka; Makowski, Mariusz; Todorović, Tamara; Filipović, Nenad R.

(American Chemical Society, 2020)

TY  - JOUR
AU  - Ristić, Predrag
AU  - Blagojević, Vladimir A.
AU  - Janjić, Goran V.
AU  - Rodić, Marko
AU  - Vulić, Predrag J.
AU  - Donnard, Morgan
AU  - Gulea, Mihaela
AU  - Chylewska, Agnieszka
AU  - Makowski, Mariusz
AU  - Todorović, Tamara
AU  - Filipović, Nenad R.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/9453
AB  - Pt(II) and Pd(II) complexes (1 and 2, respectively) with thiomorpholine-4-carbonitrile (TM-CN), an N-substituted thiomorpholine derivative, were synthesized from tetrachlorido precursors in water. Structural analysis has shown that 1 represents the first monomeric metal complex with this ligand type with an axial M-S bond with respect to the TM-CN ring chair conformation, while in 2 a typical equatorial M-S bond position with respect to the ring chair conformation was observed. A detailed DFT investigation revealed that axial conformers are more stable for molecular forms of both metals, while intermolecular interactions in the crystals stabilize the axial conformer for Pt(II) and the equatorial conformer for Pd(II). The magnitude of this stabilization in the case of 2 is large enough to change the most stable axial conformer in the molecular form to the equatorial conformer in the crystal. Further investigation of the strength of individual intermolecular interactions revealed significant differences of some interactions between the two structures. The likely cause of the difference in the crystal structures of experimentally obtained complexes is the fact that 1 and 2 exhibit different dominant interactions: C-H/M and C-H/S are more dominant in 1 and C-H/Cl interactions are more dominant in 2. In addition, DFT calculations have shown that while the axial position of the Pt-S bond with respect to the ring chair conformation results in a significantly shorter C-H/Pt interaction distance than that in the hypothetical equatorial conformer, there is very little difference in C-H/Pd interaction distances in conformers with axial and equatorial positions of Pd-S bond with respect to the ring chair conformation.
PB  - American Chemical Society
T2  - Crystal Growth & Design
T1  - Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study
SP  - 3018
EP  - 3033
VL  - 20
IS  - 5
DO  - 10.1021/acs.cgd.9b01661
UR  - https://hdl.handle.net/21.15107/rcub_dais_9453
ER  - 
@article{
author = "Ristić, Predrag and Blagojević, Vladimir A. and Janjić, Goran V. and Rodić, Marko and Vulić, Predrag J. and Donnard, Morgan and Gulea, Mihaela and Chylewska, Agnieszka and Makowski, Mariusz and Todorović, Tamara and Filipović, Nenad R.",
year = "2020",
abstract = "Pt(II) and Pd(II) complexes (1 and 2, respectively) with thiomorpholine-4-carbonitrile (TM-CN), an N-substituted thiomorpholine derivative, were synthesized from tetrachlorido precursors in water. Structural analysis has shown that 1 represents the first monomeric metal complex with this ligand type with an axial M-S bond with respect to the TM-CN ring chair conformation, while in 2 a typical equatorial M-S bond position with respect to the ring chair conformation was observed. A detailed DFT investigation revealed that axial conformers are more stable for molecular forms of both metals, while intermolecular interactions in the crystals stabilize the axial conformer for Pt(II) and the equatorial conformer for Pd(II). The magnitude of this stabilization in the case of 2 is large enough to change the most stable axial conformer in the molecular form to the equatorial conformer in the crystal. Further investigation of the strength of individual intermolecular interactions revealed significant differences of some interactions between the two structures. The likely cause of the difference in the crystal structures of experimentally obtained complexes is the fact that 1 and 2 exhibit different dominant interactions: C-H/M and C-H/S are more dominant in 1 and C-H/Cl interactions are more dominant in 2. In addition, DFT calculations have shown that while the axial position of the Pt-S bond with respect to the ring chair conformation results in a significantly shorter C-H/Pt interaction distance than that in the hypothetical equatorial conformer, there is very little difference in C-H/Pd interaction distances in conformers with axial and equatorial positions of Pd-S bond with respect to the ring chair conformation.",
publisher = "American Chemical Society",
journal = "Crystal Growth & Design",
title = "Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study",
pages = "3018-3033",
volume = "20",
number = "5",
doi = "10.1021/acs.cgd.9b01661",
url = "https://hdl.handle.net/21.15107/rcub_dais_9453"
}
Ristić, P., Blagojević, V. A., Janjić, G. V., Rodić, M., Vulić, P. J., Donnard, M., Gulea, M., Chylewska, A., Makowski, M., Todorović, T.,& Filipović, N. R.. (2020). Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study. in Crystal Growth & Design
American Chemical Society., 20(5), 3018-3033.
https://doi.org/10.1021/acs.cgd.9b01661
https://hdl.handle.net/21.15107/rcub_dais_9453
Ristić P, Blagojević VA, Janjić GV, Rodić M, Vulić PJ, Donnard M, Gulea M, Chylewska A, Makowski M, Todorović T, Filipović NR. Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study. in Crystal Growth & Design. 2020;20(5):3018-3033.
doi:10.1021/acs.cgd.9b01661
https://hdl.handle.net/21.15107/rcub_dais_9453 .
Ristić, Predrag, Blagojević, Vladimir A., Janjić, Goran V., Rodić, Marko, Vulić, Predrag J., Donnard, Morgan, Gulea, Mihaela, Chylewska, Agnieszka, Makowski, Mariusz, Todorović, Tamara, Filipović, Nenad R., "Influence of C–H/X (X = S, Cl, N, Pt/Pd) Interactions on the Molecular and Crystal Structures of Pt(II) and Pd(II) Complexes with Thiomorpholine-4-carbonitrile: Crystallographic, Thermal, and DFT Study" in Crystal Growth & Design, 20, no. 5 (2020):3018-3033,
https://doi.org/10.1021/acs.cgd.9b01661 .,
https://hdl.handle.net/21.15107/rcub_dais_9453 .
1
3
3
3

Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike

Živojinović, Jelena A.

(Универзитет у Београду, Технолошко-металуршки факултет, 2020)

TY  - THES
AU  - Živojinović, Jelena A.
PY  - 2020
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=7481
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:22343/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=17167369
UR  - http://nardus.mpn.gov.rs/handle/123456789/17287
UR  - https://dais.sanu.ac.rs/123456789/9154
AB  - Cilj ove doktorske disertacije je bio da se analizira i sagleda uticaj mehaničke aktivacije nastrukturu i svojstva nedopiranog i dopiranog SrTiO3 praha, kao i uticaj na strukturu i svojstvakeramike dobijene sinterovanjem ispresaka pomenutih prahova. U slučaju sinterovanih nedopiranihSrTiO3 uzoraka dodatno su razmatrane promene u brzini densifikacije i kinetici sinterovanja. Uticajmehaničke aktivacije i dopanta na električna svojstva stroncijum-titanatne keramike je analiziranmerenjem frekventne zavisnosti relativne dielektrične permitivnosti i tangensa ugla dielektričnihgubitaka na sobnoj temperaturi. Magnetnim merenjima, kod dopiranih SrTiO3 uzoraka dobijenihdodavanjem mangan(IV)-oksida, praćen je uticaj mehaničke aktivacije, koncentracije dopanta ijačine magnetnog polja na vrednost specifične magnetizacije.Mehanička aktivacija SrTiO3 praha je vršena u visoko-energetskom planetarnom mlinu sakuglama, pri čemu je vreme aktivacije nedopiranog praha iznosilo: 5, 10, 30, 60, 90 i 120 minuta,dok je efekat dopiranja razmatran za aktivaciju od 10, 30 i 120 minuta. U cilju dobijanja SrTiO3:Mnsistema, tipa Sr1-xMnxTiO3 (SMnT) ili SrTi1-xMnxO3 (STMn), u polazni SrTiO3 prah je dodatmangan(IV)-oksid (MnO2), pri čemu su izabrane vrednosti za x bile: 0,03, 0,06 i 0,12. Raspodelaveličina čestica je ukazala da je mehanička aktivacija dovela do usitnjavanja čestica polaznog praha,uz istovremenu pojavu šire raspodele veličina čestica pri dužim vremenima aktivacije.Skenirajućom i transmisionom elektronskom mikroskopijom (SEM i TEM) analizirana jemikrostruktura i morfologija polaznog i mehanički aktiviranih prahova. BET metodom je utvrđenoda se najviša vrednost specifične površine kod nedopiranih prahova postiže pri aktivaciji u trajanjuod 60 minuta, dok pri daljoj aktivaciji specifična površina ostaje približno konstantne vrednosti,usled povećane sekundarne aglomerizacije. Pokazano je da je gustina ispreska kod prahaaktiviranog tokom 10-30 minuta najveća. Zapaženo je sniženje intenziteta XRD pikova sa porastomvremena aktivacije, kao i širenje difrakcionih linija, usled smanjenja veličine kristalita i porastamikronaprezanja. Primenjena mehanička aktivacija je omogućila formiranje kubnog nanokristalnogSrTiO3 praha, pri čemu veličina kristalita opada i do ~20 nm sa uvećanjem vremena aktivacije.Uočena promena u vrednosti parametra kristalne rešetke a je posredno ukazala i na mogućepromene u koncentraciji kiseonikovih vakancija. Analizom Ramanovih spektara je praćen uticajmehaničke aktivacije na promene u fononskom spektru prahova, sa posebnim akcentom na polarneTO mode, čiji oblik i intenzitet bitno zavise od defekata kao što su kiseonikove vakancije. Analizaoptičkih svojstava kristalnih materijala pomoću UV-Vis spektroskopije je ukazala na sniženjeenergije zabranjene zone sa uvećanjem vremena aktivacije. Primenom dilatometrije je ispitivanuticaj mehaničke aktivacije na početni stadijum sinterovanja dvostrano presovanih SrTiO3 prahova.Uočeno je značajno smanjenje temperature početka skupljanja ispreska, kao i uticaj na brzinuskupljanja i na konačne gustine sinterovanih uzoraka. Primena Dornove metode je ukazala naznačajno smanjenje efektivne energije aktivacije transporta mase u početnom stadijumusinterovanja, sa porastom vremena mehaničke aktivacije polaznog praha. Za uzorke dobijenesinterovanjem do 1300 oC, uz izotermsko zadržavanje na maksimalnoj temperaturi u trajanju od 2h,je izvršena korelacija između zapaženih strukturnih promena i promena u dielektričnim svojstvima,nastalim usled mehaničke aktivacije. Posebna pažnja je posvećena uticaju promena: gustine,poroznosti, veličine zrna i kristalita, kao i uticaju promena parametra kristalne rešetke, nadielektrična svojstva. Promene vrednosti relativne dielektrične permitivnosti su razmatrane i sastanovišta promena u oblasti granice zrna, posebno imajući u vidu rezultate koji su ukazali napromenu koncentracije kiseonikovih vakancija...
AB  - The aim of this doctoral dissertation is to analyze and evaluate the effect of mechanicalactivation on the structure and properties of undoped and doped SrTiO3 powders, as well as theeffect on the structure and properties of the ceramics obtained by sintering these powders. For thesintered undoped SrTiO3 samples, changes in the densification rate were also analyzed. The effectof mechanical activation and dopant on the electrical properties of strontium titanate ceramics wasanalyzed by measuring the frequency-dependent relative dielectric permittivity and the loss tangentat room temperature. Magnetic measurements performed on the doped SrTiO3 samples obtained bythe addition of manganese(IV) oxide were used to monitor the influence of mechanical activation,dopant concentration and magnetic field strength on magnetization.The mechanical activation of the SrTiO3 powder was performed in a high-energy planetaryball mill; the activation times of the undoped powder were: 5, 10, 30, 60, 90, and 120 minutes,while the doping effect was analyzed for the activation periods of 10, 30, and 120 minutes. In orderto obtain SrTiO3:Mn systems belonging to Sr1-xMnxTiO3 (SMnT) or SrTi1-xMnxO3 (STMn)compound types, manganese(IV) oxide (MnO2) was added to the starting SrTiO3 powder, where thevalues selected for x were: 0.03, 0.06 and 0.12. The particle size distribution indicated thatmechanical activation resulted in the comminution of the starting powder particles, accompaniedwith a wider particle size distribution at longer activation times. The microstructural andmorphological analysis of the starting and mechanically activated powders was performed usingscanning and transmission electron microscopy (SEM and TEM). The BET method revealed that60-minute activation resulted in the highest specific surface area in undoped powders, while furtheractivation led to a relatively constant specific surface due to increased secondary agglomeration.The density of the powder activated for 10-30 minutes was the highest. The intensity of XRD peaksdecreased with longer activation times and diffraction lines broadened due to decreased crystallitesizes and increased microstrain. Mechanical activation led to the formation of cubic nanocrystallineSrTiO3 powder, with the minimum crystallite size of 20 nm. The observed change in the value ofthe crystal lattice parameter indirectly indicated possible changes in the concentration of oxygenvacancies. The analysis of Raman spectra revealed the effect of mechanical activation on thephonon spectrum of powders, with particular emphasis on polar TO modes which shape andintensity generally depend on defects such as oxygen vacancies. The analysis of the opticalproperties of crystalline materials by UV-Vis spectroscopy indicated a correlation betweendecreased band gap energy and increased activation times. The effect of mechanical activation onthe initial stage of sintering of bilaterally pressed SrTiO3 powders was investigated by dilatometry.A significant decrease in the temperature of the onset of densification was observed, as well as theeffect of mechanical activation on the densification rate and on the final density of the sinteredsamples. The application of the Dorn method indicated a significant decrease in the effectiveactivation energy of mass transport in the initial sintering stage, with a longer time of themechanical activation of the starting powder. For the samples obtained by sintering up to 1300 °C,with isothermal retention at the maximum temperature for 2 h, a correlation between the structuralchanges and the changes in dielectric properties resulting from mechanical activation was observed.Particular attention was paid to the effect of changes: density, porosity, grain and crystallite size, as well as the effect of crystal lattice parameter changes on the dielectric properties. The changed values of the relative dielectric permittivity were analyzed in the context of the changes in the grainboundary region, with special respect to the results indicating changes in the oxygen vacancy concentration.
PB  - Универзитет у Београду, Технолошко-металуршки факултет
T2  - Универзитет у Београду
T1  - Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike
UR  - https://hdl.handle.net/21.15107/rcub_dais_9154
ER  - 
@phdthesis{
author = "Živojinović, Jelena A.",
year = "2020",
abstract = "Cilj ove doktorske disertacije je bio da se analizira i sagleda uticaj mehaničke aktivacije nastrukturu i svojstva nedopiranog i dopiranog SrTiO3 praha, kao i uticaj na strukturu i svojstvakeramike dobijene sinterovanjem ispresaka pomenutih prahova. U slučaju sinterovanih nedopiranihSrTiO3 uzoraka dodatno su razmatrane promene u brzini densifikacije i kinetici sinterovanja. Uticajmehaničke aktivacije i dopanta na električna svojstva stroncijum-titanatne keramike je analiziranmerenjem frekventne zavisnosti relativne dielektrične permitivnosti i tangensa ugla dielektričnihgubitaka na sobnoj temperaturi. Magnetnim merenjima, kod dopiranih SrTiO3 uzoraka dobijenihdodavanjem mangan(IV)-oksida, praćen je uticaj mehaničke aktivacije, koncentracije dopanta ijačine magnetnog polja na vrednost specifične magnetizacije.Mehanička aktivacija SrTiO3 praha je vršena u visoko-energetskom planetarnom mlinu sakuglama, pri čemu je vreme aktivacije nedopiranog praha iznosilo: 5, 10, 30, 60, 90 i 120 minuta,dok je efekat dopiranja razmatran za aktivaciju od 10, 30 i 120 minuta. U cilju dobijanja SrTiO3:Mnsistema, tipa Sr1-xMnxTiO3 (SMnT) ili SrTi1-xMnxO3 (STMn), u polazni SrTiO3 prah je dodatmangan(IV)-oksid (MnO2), pri čemu su izabrane vrednosti za x bile: 0,03, 0,06 i 0,12. Raspodelaveličina čestica je ukazala da je mehanička aktivacija dovela do usitnjavanja čestica polaznog praha,uz istovremenu pojavu šire raspodele veličina čestica pri dužim vremenima aktivacije.Skenirajućom i transmisionom elektronskom mikroskopijom (SEM i TEM) analizirana jemikrostruktura i morfologija polaznog i mehanički aktiviranih prahova. BET metodom je utvrđenoda se najviša vrednost specifične površine kod nedopiranih prahova postiže pri aktivaciji u trajanjuod 60 minuta, dok pri daljoj aktivaciji specifična površina ostaje približno konstantne vrednosti,usled povećane sekundarne aglomerizacije. Pokazano je da je gustina ispreska kod prahaaktiviranog tokom 10-30 minuta najveća. Zapaženo je sniženje intenziteta XRD pikova sa porastomvremena aktivacije, kao i širenje difrakcionih linija, usled smanjenja veličine kristalita i porastamikronaprezanja. Primenjena mehanička aktivacija je omogućila formiranje kubnog nanokristalnogSrTiO3 praha, pri čemu veličina kristalita opada i do ~20 nm sa uvećanjem vremena aktivacije.Uočena promena u vrednosti parametra kristalne rešetke a je posredno ukazala i na mogućepromene u koncentraciji kiseonikovih vakancija. Analizom Ramanovih spektara je praćen uticajmehaničke aktivacije na promene u fononskom spektru prahova, sa posebnim akcentom na polarneTO mode, čiji oblik i intenzitet bitno zavise od defekata kao što su kiseonikove vakancije. Analizaoptičkih svojstava kristalnih materijala pomoću UV-Vis spektroskopije je ukazala na sniženjeenergije zabranjene zone sa uvećanjem vremena aktivacije. Primenom dilatometrije je ispitivanuticaj mehaničke aktivacije na početni stadijum sinterovanja dvostrano presovanih SrTiO3 prahova.Uočeno je značajno smanjenje temperature početka skupljanja ispreska, kao i uticaj na brzinuskupljanja i na konačne gustine sinterovanih uzoraka. Primena Dornove metode je ukazala naznačajno smanjenje efektivne energije aktivacije transporta mase u početnom stadijumusinterovanja, sa porastom vremena mehaničke aktivacije polaznog praha. Za uzorke dobijenesinterovanjem do 1300 oC, uz izotermsko zadržavanje na maksimalnoj temperaturi u trajanju od 2h,je izvršena korelacija između zapaženih strukturnih promena i promena u dielektričnim svojstvima,nastalim usled mehaničke aktivacije. Posebna pažnja je posvećena uticaju promena: gustine,poroznosti, veličine zrna i kristalita, kao i uticaju promena parametra kristalne rešetke, nadielektrična svojstva. Promene vrednosti relativne dielektrične permitivnosti su razmatrane i sastanovišta promena u oblasti granice zrna, posebno imajući u vidu rezultate koji su ukazali napromenu koncentracije kiseonikovih vakancija..., The aim of this doctoral dissertation is to analyze and evaluate the effect of mechanicalactivation on the structure and properties of undoped and doped SrTiO3 powders, as well as theeffect on the structure and properties of the ceramics obtained by sintering these powders. For thesintered undoped SrTiO3 samples, changes in the densification rate were also analyzed. The effectof mechanical activation and dopant on the electrical properties of strontium titanate ceramics wasanalyzed by measuring the frequency-dependent relative dielectric permittivity and the loss tangentat room temperature. Magnetic measurements performed on the doped SrTiO3 samples obtained bythe addition of manganese(IV) oxide were used to monitor the influence of mechanical activation,dopant concentration and magnetic field strength on magnetization.The mechanical activation of the SrTiO3 powder was performed in a high-energy planetaryball mill; the activation times of the undoped powder were: 5, 10, 30, 60, 90, and 120 minutes,while the doping effect was analyzed for the activation periods of 10, 30, and 120 minutes. In orderto obtain SrTiO3:Mn systems belonging to Sr1-xMnxTiO3 (SMnT) or SrTi1-xMnxO3 (STMn)compound types, manganese(IV) oxide (MnO2) was added to the starting SrTiO3 powder, where thevalues selected for x were: 0.03, 0.06 and 0.12. The particle size distribution indicated thatmechanical activation resulted in the comminution of the starting powder particles, accompaniedwith a wider particle size distribution at longer activation times. The microstructural andmorphological analysis of the starting and mechanically activated powders was performed usingscanning and transmission electron microscopy (SEM and TEM). The BET method revealed that60-minute activation resulted in the highest specific surface area in undoped powders, while furtheractivation led to a relatively constant specific surface due to increased secondary agglomeration.The density of the powder activated for 10-30 minutes was the highest. The intensity of XRD peaksdecreased with longer activation times and diffraction lines broadened due to decreased crystallitesizes and increased microstrain. Mechanical activation led to the formation of cubic nanocrystallineSrTiO3 powder, with the minimum crystallite size of 20 nm. The observed change in the value ofthe crystal lattice parameter indirectly indicated possible changes in the concentration of oxygenvacancies. The analysis of Raman spectra revealed the effect of mechanical activation on thephonon spectrum of powders, with particular emphasis on polar TO modes which shape andintensity generally depend on defects such as oxygen vacancies. The analysis of the opticalproperties of crystalline materials by UV-Vis spectroscopy indicated a correlation betweendecreased band gap energy and increased activation times. The effect of mechanical activation onthe initial stage of sintering of bilaterally pressed SrTiO3 powders was investigated by dilatometry.A significant decrease in the temperature of the onset of densification was observed, as well as theeffect of mechanical activation on the densification rate and on the final density of the sinteredsamples. The application of the Dorn method indicated a significant decrease in the effectiveactivation energy of mass transport in the initial sintering stage, with a longer time of themechanical activation of the starting powder. For the samples obtained by sintering up to 1300 °C,with isothermal retention at the maximum temperature for 2 h, a correlation between the structuralchanges and the changes in dielectric properties resulting from mechanical activation was observed.Particular attention was paid to the effect of changes: density, porosity, grain and crystallite size, as well as the effect of crystal lattice parameter changes on the dielectric properties. The changed values of the relative dielectric permittivity were analyzed in the context of the changes in the grainboundary region, with special respect to the results indicating changes in the oxygen vacancy concentration.",
publisher = "Универзитет у Београду, Технолошко-металуршки факултет",
journal = "Универзитет у Београду",
title = "Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike",
url = "https://hdl.handle.net/21.15107/rcub_dais_9154"
}
Živojinović, J. A.. (2020). Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike. in Универзитет у Београду
Универзитет у Београду, Технолошко-металуршки факултет..
https://hdl.handle.net/21.15107/rcub_dais_9154
Živojinović JA. Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike. in Универзитет у Београду. 2020;.
https://hdl.handle.net/21.15107/rcub_dais_9154 .
Živojinović, Jelena A., "Uticaj mehaničke aktivacije na strukturu i svojstva stroncijum-titanatne keramike" in Универзитет у Београду (2020),
https://hdl.handle.net/21.15107/rcub_dais_9154 .

The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation

Spasojević, Milica; Ribić Zelenović, Lenka; Spasojević, Miroslav; Trišović, Tomislav

(Editura Academiei Romane, 2020)

TY  - JOUR
AU  - Spasojević, Milica
AU  - Ribić Zelenović, Lenka
AU  - Spasojević, Miroslav
AU  - Trišović, Tomislav
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10033
AB  - A catalytic coating composed of a mixture of RuO2 and Pt nanocrystals was prepared by a thermal procedure on a titanium substrate and used for the electrochemical oxidation of methanol. The adsorption of the intermediate CO, formed by methanol oxidation on Pt nanocrystals, depended on potential and the coating composition. An increase in the RuO2 content decreased the rate of methanol dehydrogenation and increased the rate of oxidation of the strongly bound intermediate COad. This caused a decrease in the maximum coverage of Pt nanocrystals with COad and a shift of the rapid linear drop in COad coverage to more negative potentials.
PB  - Editura Academiei Romane
T2  - Revue Roumaine de Chimie
T1  - The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation
SP  - 481
EP  - 489
VL  - 65
IS  - 5
DO  - 10.33224/rrch.2020.65.5.08
UR  - https://hdl.handle.net/21.15107/rcub_dais_10033
ER  - 
@article{
author = "Spasojević, Milica and Ribić Zelenović, Lenka and Spasojević, Miroslav and Trišović, Tomislav",
year = "2020",
abstract = "A catalytic coating composed of a mixture of RuO2 and Pt nanocrystals was prepared by a thermal procedure on a titanium substrate and used for the electrochemical oxidation of methanol. The adsorption of the intermediate CO, formed by methanol oxidation on Pt nanocrystals, depended on potential and the coating composition. An increase in the RuO2 content decreased the rate of methanol dehydrogenation and increased the rate of oxidation of the strongly bound intermediate COad. This caused a decrease in the maximum coverage of Pt nanocrystals with COad and a shift of the rapid linear drop in COad coverage to more negative potentials.",
publisher = "Editura Academiei Romane",
journal = "Revue Roumaine de Chimie",
title = "The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation",
pages = "481-489",
volume = "65",
number = "5",
doi = "10.33224/rrch.2020.65.5.08",
url = "https://hdl.handle.net/21.15107/rcub_dais_10033"
}
Spasojević, M., Ribić Zelenović, L., Spasojević, M.,& Trišović, T.. (2020). The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation. in Revue Roumaine de Chimie
Editura Academiei Romane., 65(5), 481-489.
https://doi.org/10.33224/rrch.2020.65.5.08
https://hdl.handle.net/21.15107/rcub_dais_10033
Spasojević M, Ribić Zelenović L, Spasojević M, Trišović T. The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation. in Revue Roumaine de Chimie. 2020;65(5):481-489.
doi:10.33224/rrch.2020.65.5.08
https://hdl.handle.net/21.15107/rcub_dais_10033 .
Spasojević, Milica, Ribić Zelenović, Lenka, Spasojević, Miroslav, Trišović, Tomislav, "The effect of the composition of the alloy of RuO2 and Pt nanocrystals on intermediate adsorption during methanol oxidation" in Revue Roumaine de Chimie, 65, no. 5 (2020):481-489,
https://doi.org/10.33224/rrch.2020.65.5.08 .,
https://hdl.handle.net/21.15107/rcub_dais_10033 .
2
1
2

Niobium doping effect on BaTiO3 structure and dielectric properties

Paunović, Vesna; Mitić, Vojislav V.; Đorđević, M.; Prijić, Z.

(Elsevier, 2020)

TY  - JOUR
AU  - Paunović, Vesna
AU  - Mitić, Vojislav V.
AU  - Đorđević, M.
AU  - Prijić, Z.
PY  - 2020
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219335205
UR  - http://dais.sanu.ac.rs/123456789/8964
AB  - The effect of Nb on the microstructure and dielectric properties of BaTiO3 ceramics was investigated. The Nb/Mn–BaTiO3 ceramics were prepared using a conventional solid-state method. The concentration of Nb varied from 0.1 to 5.0 at% but Mn was fixed at 0.05 at%. The SEM indicated that compositions of 0.1 and 0.5 at% Nb displayed a fairly uniform microstructure and homogeneous distribution of additives, with a grain size of less than 2 μm. In highly doped samples a wide range of microstructural features was observed, from homogeneous and completely fine-grained microstructure to the appearance of secondary abnormal grains with core-shell structure. The dielectric constant and the loss tangent of modified ceramics were measured as a function of temperature (20–180 °C) and frequency (100 Hz-1MHz) for different concentrations of additives. The obtained results have shown that the dielectric constant at, both, room temperature (εr) and Curie temperature (εrmax), decreased as the concentration of Nb5+ increased. Thus, the highest values for the dielectric constant at room temperature (εr = 6648) as well as at Curie temperature (εrmax = 7680) were measured for the 0.1Nb/Mn–BaTiO3 samples sintered at 1350 °C. The highly doped BaTiO3 ceramics were found to exhibit lower values of the dielectric constant and low dielectric losses at room temperature. In these samples, stable dielectric permittivity with a flat dielectric behavior over a wide temperature range is observed. The Curie constant for all series of samples decreases with an increase of dopant concentration and the highest values were measured from samples doped with 0.1 at% Nb. The effect of additives on the Curie constant change is more pronounced at higher sintering temperatures. The analysis of the critical nonlinearity exponent (γ = 1.07–1.27), for lower dopant concentrations, shows a sharp phase transformation. For samples with increased Nb content, the degree of nonlinearity γ is higher indicating a diffuse phase transformation.
PB  - Elsevier
T2  - Ceramics International
T1  - Niobium doping effect on BaTiO3 structure and dielectric properties
SP  - 8154
EP  - 8164
VL  - 46
IS  - 6
DO  - 10.1016/j.ceramint.2019.12.043
UR  - https://hdl.handle.net/21.15107/rcub_dais_8964
ER  - 
@article{
author = "Paunović, Vesna and Mitić, Vojislav V. and Đorđević, M. and Prijić, Z.",
year = "2020",
abstract = "The effect of Nb on the microstructure and dielectric properties of BaTiO3 ceramics was investigated. The Nb/Mn–BaTiO3 ceramics were prepared using a conventional solid-state method. The concentration of Nb varied from 0.1 to 5.0 at% but Mn was fixed at 0.05 at%. The SEM indicated that compositions of 0.1 and 0.5 at% Nb displayed a fairly uniform microstructure and homogeneous distribution of additives, with a grain size of less than 2 μm. In highly doped samples a wide range of microstructural features was observed, from homogeneous and completely fine-grained microstructure to the appearance of secondary abnormal grains with core-shell structure. The dielectric constant and the loss tangent of modified ceramics were measured as a function of temperature (20–180 °C) and frequency (100 Hz-1MHz) for different concentrations of additives. The obtained results have shown that the dielectric constant at, both, room temperature (εr) and Curie temperature (εrmax), decreased as the concentration of Nb5+ increased. Thus, the highest values for the dielectric constant at room temperature (εr = 6648) as well as at Curie temperature (εrmax = 7680) were measured for the 0.1Nb/Mn–BaTiO3 samples sintered at 1350 °C. The highly doped BaTiO3 ceramics were found to exhibit lower values of the dielectric constant and low dielectric losses at room temperature. In these samples, stable dielectric permittivity with a flat dielectric behavior over a wide temperature range is observed. The Curie constant for all series of samples decreases with an increase of dopant concentration and the highest values were measured from samples doped with 0.1 at% Nb. The effect of additives on the Curie constant change is more pronounced at higher sintering temperatures. The analysis of the critical nonlinearity exponent (γ = 1.07–1.27), for lower dopant concentrations, shows a sharp phase transformation. For samples with increased Nb content, the degree of nonlinearity γ is higher indicating a diffuse phase transformation.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Niobium doping effect on BaTiO3 structure and dielectric properties",
pages = "8154-8164",
volume = "46",
number = "6",
doi = "10.1016/j.ceramint.2019.12.043",
url = "https://hdl.handle.net/21.15107/rcub_dais_8964"
}
Paunović, V., Mitić, V. V., Đorđević, M.,& Prijić, Z.. (2020). Niobium doping effect on BaTiO3 structure and dielectric properties. in Ceramics International
Elsevier., 46(6), 8154-8164.
https://doi.org/10.1016/j.ceramint.2019.12.043
https://hdl.handle.net/21.15107/rcub_dais_8964
Paunović V, Mitić VV, Đorđević M, Prijić Z. Niobium doping effect on BaTiO3 structure and dielectric properties. in Ceramics International. 2020;46(6):8154-8164.
doi:10.1016/j.ceramint.2019.12.043
https://hdl.handle.net/21.15107/rcub_dais_8964 .
Paunović, Vesna, Mitić, Vojislav V., Đorđević, M., Prijić, Z., "Niobium doping effect on BaTiO3 structure and dielectric properties" in Ceramics International, 46, no. 6 (2020):8154-8164,
https://doi.org/10.1016/j.ceramint.2019.12.043 .,
https://hdl.handle.net/21.15107/rcub_dais_8964 .
4
3
3

Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders

Spasojević, Miroslav; Ranđić, Siniša; Maričić, Aleksa; Trišović, Tomislav; Spasojević, Milica

(Springer, 2020)

TY  - JOUR
AU  - Spasojević, Miroslav
AU  - Ranđić, Siniša
AU  - Maričić, Aleksa
AU  - Trišović, Tomislav
AU  - Spasojević, Milica
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/9451
AB  - Nanostructured Ni-Fe-W-Cu alloy powders were electrodeposited from an alkaline ammonium citrate solution on a titanium cathode. Powder particles were dendrite- and cauliflower-shaped. The dendritic particles had a high density of branches made up of interconnected globules. XRD analysis showed that the powder contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. As the deposition current density increased, the mean nanocrystal size decreased, and the mean value of internal microstrain and the total weight percent of Fe and Ni in the alloy increased. The powders deposited at higher current densities exhibited higher magnetization. During annealing at temperatures up to 460 °C, the powders underwent short-range ordering, which caused an increase in magnetization, whereas at temperatures above 460 °C, the magnetization decreased due to the formation of large FCC crystalline grains.
PB  - Springer
T2  - Science of Sintering
T1  - Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders
SP  - 109
EP  - 121
VL  - 52
IS  - 1
DO  - 10.2298/SOS2001109S
UR  - https://hdl.handle.net/21.15107/rcub_dais_9451
ER  - 
@article{
author = "Spasojević, Miroslav and Ranđić, Siniša and Maričić, Aleksa and Trišović, Tomislav and Spasojević, Milica",
year = "2020",
abstract = "Nanostructured Ni-Fe-W-Cu alloy powders were electrodeposited from an alkaline ammonium citrate solution on a titanium cathode. Powder particles were dendrite- and cauliflower-shaped. The dendritic particles had a high density of branches made up of interconnected globules. XRD analysis showed that the powder contained an amorphous matrix and FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. As the deposition current density increased, the mean nanocrystal size decreased, and the mean value of internal microstrain and the total weight percent of Fe and Ni in the alloy increased. The powders deposited at higher current densities exhibited higher magnetization. During annealing at temperatures up to 460 °C, the powders underwent short-range ordering, which caused an increase in magnetization, whereas at temperatures above 460 °C, the magnetization decreased due to the formation of large FCC crystalline grains.",
publisher = "Springer",
journal = "Science of Sintering",
title = "Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders",
pages = "109-121",
volume = "52",
number = "1",
doi = "10.2298/SOS2001109S",
url = "https://hdl.handle.net/21.15107/rcub_dais_9451"
}
Spasojević, M., Ranđić, S., Maričić, A., Trišović, T.,& Spasojević, M.. (2020). Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders. in Science of Sintering
Springer., 52(1), 109-121.
https://doi.org/10.2298/SOS2001109S
https://hdl.handle.net/21.15107/rcub_dais_9451
Spasojević M, Ranđić S, Maričić A, Trišović T, Spasojević M. Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders. in Science of Sintering. 2020;52(1):109-121.
doi:10.2298/SOS2001109S
https://hdl.handle.net/21.15107/rcub_dais_9451 .
Spasojević, Miroslav, Ranđić, Siniša, Maričić, Aleksa, Trišović, Tomislav, Spasojević, Milica, "Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders" in Science of Sintering, 52, no. 1 (2020):109-121,
https://doi.org/10.2298/SOS2001109S .,
https://hdl.handle.net/21.15107/rcub_dais_9451 .
1
1
1

Kinetics of thermally activated processes in cordierite-based ceramics

Obradović, Nina; Blagojević, Vladimir A.; Filipović, Suzana; Đorđević, Antonije; Kosanović, Darko; Marković, Smilja; Kachlik, Martin; Maca, Karel; Pavlović, Vladimir B.

(Springer, 2019)

TY  - JOUR
AU  - Obradović, Nina
AU  - Blagojević, Vladimir A.
AU  - Filipović, Suzana
AU  - Đorđević, Antonije
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7048
AB  - Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100–1400 °C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 °C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Kinetics of thermally activated processes in cordierite-based ceramics
SP  - 2989
EP  - 2998
VL  - 138
DO  - 10.1007/s10973-018-7924-1
UR  - https://hdl.handle.net/21.15107/rcub_dais_7048
ER  - 
@article{
author = "Obradović, Nina and Blagojević, Vladimir A. and Filipović, Suzana and Đorđević, Antonije and Kosanović, Darko and Marković, Smilja and Kachlik, Martin and Maca, Karel and Pavlović, Vladimir B.",
year = "2019",
abstract = "Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100–1400 °C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 °C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Kinetics of thermally activated processes in cordierite-based ceramics",
pages = "2989-2998",
volume = "138",
doi = "10.1007/s10973-018-7924-1",
url = "https://hdl.handle.net/21.15107/rcub_dais_7048"
}
Obradović, N., Blagojević, V. A., Filipović, S., Đorđević, A., Kosanović, D., Marković, S., Kachlik, M., Maca, K.,& Pavlović, V. B.. (2019). Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 138, 2989-2998.
https://doi.org/10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_7048
Obradović N, Blagojević VA, Filipović S, Đorđević A, Kosanović D, Marković S, Kachlik M, Maca K, Pavlović VB. Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry. 2019;138:2989-2998.
doi:10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_7048 .
Obradović, Nina, Blagojević, Vladimir A., Filipović, Suzana, Đorđević, Antonije, Kosanović, Darko, Marković, Smilja, Kachlik, Martin, Maca, Karel, Pavlović, Vladimir B., "Kinetics of thermally activated processes in cordierite-based ceramics" in Journal of Thermal Analysis and Calorimetry, 138 (2019):2989-2998,
https://doi.org/10.1007/s10973-018-7924-1 .,
https://hdl.handle.net/21.15107/rcub_dais_7048 .
2
1
1

Kinetics of thermally activated processes in cordierite-based ceramics

Obradović, Nina; Blagojević, Vladimir A.; Filipović, Suzana; Đorđević, Antonije; Kosanović, Darko; Marković, Smilja; Kachlik, Martin; Maca, Karel; Pavlović, Vladimir B.

(Springer, 2019)

TY  - JOUR
AU  - Obradović, Nina
AU  - Blagojević, Vladimir A.
AU  - Filipović, Suzana
AU  - Đorđević, Antonije
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/4558
AB  - Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100–1400 °C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 °C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Kinetics of thermally activated processes in cordierite-based ceramics
SP  - 2989
EP  - 2998
VL  - 138
DO  - 10.1007/s10973-018-7924-1
UR  - https://hdl.handle.net/21.15107/rcub_dais_4558
ER  - 
@article{
author = "Obradović, Nina and Blagojević, Vladimir A. and Filipović, Suzana and Đorđević, Antonije and Kosanović, Darko and Marković, Smilja and Kachlik, Martin and Maca, Karel and Pavlović, Vladimir B.",
year = "2019",
abstract = "Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100–1400 °C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 °C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Kinetics of thermally activated processes in cordierite-based ceramics",
pages = "2989-2998",
volume = "138",
doi = "10.1007/s10973-018-7924-1",
url = "https://hdl.handle.net/21.15107/rcub_dais_4558"
}
Obradović, N., Blagojević, V. A., Filipović, S., Đorđević, A., Kosanović, D., Marković, S., Kachlik, M., Maca, K.,& Pavlović, V. B.. (2019). Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 138, 2989-2998.
https://doi.org/10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_4558
Obradović N, Blagojević VA, Filipović S, Đorđević A, Kosanović D, Marković S, Kachlik M, Maca K, Pavlović VB. Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry. 2019;138:2989-2998.
doi:10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_4558 .
Obradović, Nina, Blagojević, Vladimir A., Filipović, Suzana, Đorđević, Antonije, Kosanović, Darko, Marković, Smilja, Kachlik, Martin, Maca, Karel, Pavlović, Vladimir B., "Kinetics of thermally activated processes in cordierite-based ceramics" in Journal of Thermal Analysis and Calorimetry, 138 (2019):2989-2998,
https://doi.org/10.1007/s10973-018-7924-1 .,
https://hdl.handle.net/21.15107/rcub_dais_4558 .
2
1
1

Fractal frontiers in microelectronic ceramic materials

Mitić, Vojislav V.; Lazović, Goran; Paunović, Vesna; Cvetković, Nenad; Jovanović, Dejan; Veljković, Sandra; Ranđelović, Branislav; Vlahović, Branislav

(Elsevier, 2019)

TY  - JOUR
AU  - Mitić, Vojislav V.
AU  - Lazović, Goran
AU  - Paunović, Vesna
AU  - Cvetković, Nenad
AU  - Jovanović, Dejan
AU  - Veljković, Sandra
AU  - Ranđelović, Branislav
AU  - Vlahović, Branislav
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219300227
UR  - http://dais.sanu.ac.rs/123456789/5252
AB  - The world's perennial need for energy and microelectronic miniaturization brings with it a broad set of technological and scientific challenges. Materials characterized by precise microstructural architectures based on fractal analysis and ranging in size down to nano scale represent an important avenue for finding novel solutions. Deep materials structure hierarchies of this type open new possibilities in capacity according to the Heywang model, especially when extended by a fractals approach and intergranular relationships supported and recognized by their fractal nature. These developments are opening new frontiers in microelectronics miniaturization. They build on early fractal applications that were used as tools in miniaturization research and also provided application perspectives for diverse energy technologies. In other words, fractals, as a crucial concept of modern theoretical-experimental physics and materials sciences, are tightly linked to higher integration processes and microelectronics miniaturization. They also hold potential for meeting the energy exploitation challenge. In this research context, for the first time we experimentally and theoretically investigated the electrostatic field between the grains within fractal nature aspects. It is essentially a theoretical experiment based on samples of experimental microstructures imaged with SEM, as previously published in a number of other papers. We now take the research a step further by consolidating the experimental samples with respect to the predicted distribution of grains and pores within the sample mass. We make an original contribution by opening the frame of scale sizes with respect to the technical processes of consolidation. This lets us predict the constitutive elements of the microstructures – approximately equidistant grains and pores. In this paper we define in a practical manner the final target elements for experimental consolidation of real samples. It is the main bridge between a designed microstructure and related characteristics – for example, fractal dimensions and final properties of next-generation fractal microelectronics.
PB  - Elsevier
T2  - Ceramics International
T1  - Fractal frontiers in microelectronic ceramic materials
SP  - 9679
EP  - 9685
VL  - 45
DO  - 10.1016/j.ceramint.2019.01.020
UR  - https://hdl.handle.net/21.15107/rcub_dais_5252
ER  - 
@article{
author = "Mitić, Vojislav V. and Lazović, Goran and Paunović, Vesna and Cvetković, Nenad and Jovanović, Dejan and Veljković, Sandra and Ranđelović, Branislav and Vlahović, Branislav",
year = "2019",
abstract = "The world's perennial need for energy and microelectronic miniaturization brings with it a broad set of technological and scientific challenges. Materials characterized by precise microstructural architectures based on fractal analysis and ranging in size down to nano scale represent an important avenue for finding novel solutions. Deep materials structure hierarchies of this type open new possibilities in capacity according to the Heywang model, especially when extended by a fractals approach and intergranular relationships supported and recognized by their fractal nature. These developments are opening new frontiers in microelectronics miniaturization. They build on early fractal applications that were used as tools in miniaturization research and also provided application perspectives for diverse energy technologies. In other words, fractals, as a crucial concept of modern theoretical-experimental physics and materials sciences, are tightly linked to higher integration processes and microelectronics miniaturization. They also hold potential for meeting the energy exploitation challenge. In this research context, for the first time we experimentally and theoretically investigated the electrostatic field between the grains within fractal nature aspects. It is essentially a theoretical experiment based on samples of experimental microstructures imaged with SEM, as previously published in a number of other papers. We now take the research a step further by consolidating the experimental samples with respect to the predicted distribution of grains and pores within the sample mass. We make an original contribution by opening the frame of scale sizes with respect to the technical processes of consolidation. This lets us predict the constitutive elements of the microstructures – approximately equidistant grains and pores. In this paper we define in a practical manner the final target elements for experimental consolidation of real samples. It is the main bridge between a designed microstructure and related characteristics – for example, fractal dimensions and final properties of next-generation fractal microelectronics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Fractal frontiers in microelectronic ceramic materials",
pages = "9679-9685",
volume = "45",
doi = "10.1016/j.ceramint.2019.01.020",
url = "https://hdl.handle.net/21.15107/rcub_dais_5252"
}
Mitić, V. V., Lazović, G., Paunović, V., Cvetković, N., Jovanović, D., Veljković, S., Ranđelović, B.,& Vlahović, B.. (2019). Fractal frontiers in microelectronic ceramic materials. in Ceramics International
Elsevier., 45, 9679-9685.
https://doi.org/10.1016/j.ceramint.2019.01.020
https://hdl.handle.net/21.15107/rcub_dais_5252
Mitić VV, Lazović G, Paunović V, Cvetković N, Jovanović D, Veljković S, Ranđelović B, Vlahović B. Fractal frontiers in microelectronic ceramic materials. in Ceramics International. 2019;45:9679-9685.
doi:10.1016/j.ceramint.2019.01.020
https://hdl.handle.net/21.15107/rcub_dais_5252 .
Mitić, Vojislav V., Lazović, Goran, Paunović, Vesna, Cvetković, Nenad, Jovanović, Dejan, Veljković, Sandra, Ranđelović, Branislav, Vlahović, Branislav, "Fractal frontiers in microelectronic ceramic materials" in Ceramics International, 45 (2019):9679-9685,
https://doi.org/10.1016/j.ceramint.2019.01.020 .,
https://hdl.handle.net/21.15107/rcub_dais_5252 .
9
9
9

Ceramic materials and energy - Extended Coble’s model and fractal nature

Mitić, Vojislav V.; Lazović, Goran; Paunovic, Vesna; Hwu, Jih Ru; Tsay, Shwu-Chen; Perng, Tsong-Ping; Veljković, Sandra; Vlahović, Branislav

(Elsevier, 2019)

TY  - JOUR
AU  - Mitić, Vojislav V.
AU  - Lazović, Goran
AU  - Paunovic, Vesna
AU  - Hwu, Jih Ru
AU  - Tsay, Shwu-Chen
AU  - Perng, Tsong-Ping
AU  - Veljković, Sandra
AU  - Vlahović, Branislav
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S095522191930233X
UR  - http://dais.sanu.ac.rs/123456789/6945
AB  - The new frontiers open different directions within the higher and deeper knowledge structure using unemployed nano sizes domains. The BaTiO3 and other ceramic materials have fractal configuration nature based on three phenomena. First, ceramic grains have fractal shape looking as a contour in cross section or as a surface. Second, there is the so-called “negative space” made of pores and intergranular space. Third, there is fractal Brownian motion (fBm) within the material, during and after sintering, in the form of microparticle flow: ions, atoms, and electrons. Here, we took upon ourselves the task of extending Coble’s model, with already generalized Euclidean geometries, by fractal nature correction. These triple factors make the very peculiar microelectronic environment electro-static/dynamic combination. The stress is here set on inter-granular micro-capacity in function of higher energy harvesting and storage. Constructive fractal theory allows identifying micro-capacitors with fractal electrodes. The method is based on the iterative process of interpolation which is compatible with the grain model itself. Inter-granular permeability is taken as the fundamental thermodynamic parameter function of temperature and enthalpy (Gibbs free energy), which are very important for a structure-energy relation.
PB  - Elsevier
T2  - Journal of the European Ceramic Society
T1  - Ceramic materials and energy - Extended Coble’s model and fractal nature
SP  - 3513
EP  - 3525
VL  - 39
IS  - 12
DO  - 10.1016/j.jeurceramsoc.2019.04.009
UR  - https://hdl.handle.net/21.15107/rcub_dais_6945
ER  - 
@article{
author = "Mitić, Vojislav V. and Lazović, Goran and Paunovic, Vesna and Hwu, Jih Ru and Tsay, Shwu-Chen and Perng, Tsong-Ping and Veljković, Sandra and Vlahović, Branislav",
year = "2019",
abstract = "The new frontiers open different directions within the higher and deeper knowledge structure using unemployed nano sizes domains. The BaTiO3 and other ceramic materials have fractal configuration nature based on three phenomena. First, ceramic grains have fractal shape looking as a contour in cross section or as a surface. Second, there is the so-called “negative space” made of pores and intergranular space. Third, there is fractal Brownian motion (fBm) within the material, during and after sintering, in the form of microparticle flow: ions, atoms, and electrons. Here, we took upon ourselves the task of extending Coble’s model, with already generalized Euclidean geometries, by fractal nature correction. These triple factors make the very peculiar microelectronic environment electro-static/dynamic combination. The stress is here set on inter-granular micro-capacity in function of higher energy harvesting and storage. Constructive fractal theory allows identifying micro-capacitors with fractal electrodes. The method is based on the iterative process of interpolation which is compatible with the grain model itself. Inter-granular permeability is taken as the fundamental thermodynamic parameter function of temperature and enthalpy (Gibbs free energy), which are very important for a structure-energy relation.",
publisher = "Elsevier",
journal = "Journal of the European Ceramic Society",
title = "Ceramic materials and energy - Extended Coble’s model and fractal nature",
pages = "3513-3525",
volume = "39",
number = "12",
doi = "10.1016/j.jeurceramsoc.2019.04.009",
url = "https://hdl.handle.net/21.15107/rcub_dais_6945"
}
Mitić, V. V., Lazović, G., Paunovic, V., Hwu, J. R., Tsay, S., Perng, T., Veljković, S.,& Vlahović, B.. (2019). Ceramic materials and energy - Extended Coble’s model and fractal nature. in Journal of the European Ceramic Society
Elsevier., 39(12), 3513-3525.
https://doi.org/10.1016/j.jeurceramsoc.2019.04.009
https://hdl.handle.net/21.15107/rcub_dais_6945
Mitić VV, Lazović G, Paunovic V, Hwu JR, Tsay S, Perng T, Veljković S, Vlahović B. Ceramic materials and energy - Extended Coble’s model and fractal nature. in Journal of the European Ceramic Society. 2019;39(12):3513-3525.
doi:10.1016/j.jeurceramsoc.2019.04.009
https://hdl.handle.net/21.15107/rcub_dais_6945 .
Mitić, Vojislav V., Lazović, Goran, Paunovic, Vesna, Hwu, Jih Ru, Tsay, Shwu-Chen, Perng, Tsong-Ping, Veljković, Sandra, Vlahović, Branislav, "Ceramic materials and energy - Extended Coble’s model and fractal nature" in Journal of the European Ceramic Society, 39, no. 12 (2019):3513-3525,
https://doi.org/10.1016/j.jeurceramsoc.2019.04.009 .,
https://hdl.handle.net/21.15107/rcub_dais_6945 .
4
4
4

Morphological and structural characterization of spinel MgAl2O4

Filipović, Suzana; Obradović, Nina; Fahrenholtz, William G.; Marinković, Bojan A.; Rogan, Jelena; Lević, Steva; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2019)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Marinković, Bojan A.
AU  - Rogan, Jelena
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6779
AB  - Magnesium aluminate has spinel structure and very good mechanical, chemical, and thermal properties. Owing to these properties, it has a wide range of applications including refractory ceramics, optically transparent ceramic windows and armors. Its low dielectric permeability and low loss tangent enable its using for integrated electronic devices, as well. Furthermore, as a porous ceramic, magnesium aluminate has important application as humidity sensor, catalyst and filter for waste water purification. In this paper, synthesis and characterization of MgAl2O4 was performed. Stochiometric ratio of MgO and Al2O3powders was mixed and calcined within the temperatures range 1500-1800 oC to produce pure spinel phase. Thereafter pellets were crushed and treated in planetary ball mill for 60 minutes to obtained fine grain. All powders, calcined and milled, were examined for phase composition, crystal structure, and morphology. The obtained results showed that by increasing the temperature denser samples but more fragile have been synthesized. Milling for 1 hour leads to crumble of bigger particles and getting finer, single phase powders. XRPD and Raman spectroscopy showed disorder in crystal structure after milling.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
T1  - Morphological and structural characterization of spinel MgAl2O4
SP  - 32
EP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_dais_6779
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Fahrenholtz, William G. and Marinković, Bojan A. and Rogan, Jelena and Lević, Steva and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate has spinel structure and very good mechanical, chemical, and thermal properties. Owing to these properties, it has a wide range of applications including refractory ceramics, optically transparent ceramic windows and armors. Its low dielectric permeability and low loss tangent enable its using for integrated electronic devices, as well. Furthermore, as a porous ceramic, magnesium aluminate has important application as humidity sensor, catalyst and filter for waste water purification. In this paper, synthesis and characterization of MgAl2O4 was performed. Stochiometric ratio of MgO and Al2O3powders was mixed and calcined within the temperatures range 1500-1800 oC to produce pure spinel phase. Thereafter pellets were crushed and treated in planetary ball mill for 60 minutes to obtained fine grain. All powders, calcined and milled, were examined for phase composition, crystal structure, and morphology. The obtained results showed that by increasing the temperature denser samples but more fragile have been synthesized. Milling for 1 hour leads to crumble of bigger particles and getting finer, single phase powders. XRPD and Raman spectroscopy showed disorder in crystal structure after milling.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019",
title = "Morphological and structural characterization of spinel MgAl2O4",
pages = "32-32",
url = "https://hdl.handle.net/21.15107/rcub_dais_6779"
}
Filipović, S., Obradović, N., Fahrenholtz, W. G., Marinković, B. A., Rogan, J., Lević, S.,& Pavlović, V. B.. (2019). Morphological and structural characterization of spinel MgAl2O4. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
Belgrade : Serbian Ceramic Society., 32-32.
https://hdl.handle.net/21.15107/rcub_dais_6779
Filipović S, Obradović N, Fahrenholtz WG, Marinković BA, Rogan J, Lević S, Pavlović VB. Morphological and structural characterization of spinel MgAl2O4. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019. 2019;:32-32.
https://hdl.handle.net/21.15107/rcub_dais_6779 .
Filipović, Suzana, Obradović, Nina, Fahrenholtz, William G., Marinković, Bojan A., Rogan, Jelena, Lević, Steva, Pavlović, Vladimir B., "Morphological and structural characterization of spinel MgAl2O4" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019 (2019):32-32,
https://hdl.handle.net/21.15107/rcub_dais_6779 .

Influence of mechanical activation on kinetics and formation of spinel monitored by DTA

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Đorđević, Antonije; Pavlović, Vladimir B.

(Central and Eastern European Committee for Thermal Analysis and Calorimetry, 2019)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7020
AB  - Magnesium aluminate and other alumina-based spinels are refractory ceramics with excellent properties, such as high hardness, high mechanical strength, and low dielectric constant, applicable in many modern industries. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3 powders. Mechanical activation represents a very efficient method for increasing the reactivity of powders, accelerating chemical reactions and decreasing the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 60 minutes. Sintering was performed in air at temperatures ranging from 1200°C to 1600 °C with a 2 h dwell time. Initial powders and sintered samples were characterized using X-ray diffraction and scanning electron microscopy. Differential thermal analysis (DTA) and thermal gravimetry (TG) were used to determine the temperatures for synthesis reactions and phase transformations. Based on the DTA results, several different processes occured during heating, including evaporation of physisorbed water, decomposition of Mg(OH)2, and spinel formation. With mechanical activation, all characteristic temperatures shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of sintering temperature for all of the sintered specimens.
PB  - Central and Eastern European Committee for Thermal Analysis and Calorimetry
C3  - Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)
T1  - Influence of mechanical activation on kinetics and formation of spinel monitored by DTA
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_dais_7020
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate and other alumina-based spinels are refractory ceramics with excellent properties, such as high hardness, high mechanical strength, and low dielectric constant, applicable in many modern industries. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3 powders. Mechanical activation represents a very efficient method for increasing the reactivity of powders, accelerating chemical reactions and decreasing the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 60 minutes. Sintering was performed in air at temperatures ranging from 1200°C to 1600 °C with a 2 h dwell time. Initial powders and sintered samples were characterized using X-ray diffraction and scanning electron microscopy. Differential thermal analysis (DTA) and thermal gravimetry (TG) were used to determine the temperatures for synthesis reactions and phase transformations. Based on the DTA results, several different processes occured during heating, including evaporation of physisorbed water, decomposition of Mg(OH)2, and spinel formation. With mechanical activation, all characteristic temperatures shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of sintering temperature for all of the sintered specimens.",
publisher = "Central and Eastern European Committee for Thermal Analysis and Calorimetry",
journal = "Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)",
title = "Influence of mechanical activation on kinetics and formation of spinel monitored by DTA",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_dais_7020"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Đorđević, A.,& Pavlović, V. B.. (2019). Influence of mechanical activation on kinetics and formation of spinel monitored by DTA. in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)
Central and Eastern European Committee for Thermal Analysis and Calorimetry., 70-70.
https://hdl.handle.net/21.15107/rcub_dais_7020
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Đorđević A, Pavlović VB. Influence of mechanical activation on kinetics and formation of spinel monitored by DTA. in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019). 2019;:70-70.
https://hdl.handle.net/21.15107/rcub_dais_7020 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Đorđević, Antonije, Pavlović, Vladimir B., "Influence of mechanical activation on kinetics and formation of spinel monitored by DTA" in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019) (2019):70-70,
https://hdl.handle.net/21.15107/rcub_dais_7020 .

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

Filipović, Suzana; Pavlović, Vera P.; Mitrić, Miodrag; Lević, Steva; Mitrović, Nebojša; Maričić, Aleksa; Vlahović, Branislav; Pavlović, Vladimir B.

(Springer, 2019)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Pavlović, Vera P.
AU  - Mitrić, Miodrag
AU  - Lević, Steva
AU  - Mitrović, Nebojša
AU  - Maričić, Aleksa
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://doi.org/10.1007/s40145-018-0301-5
UR  - http://dais.sanu.ac.rs/123456789/5271
AB  - Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method (co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.
PB  - Springer
T2  - Journal of Advanced Ceramics
T1  - Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure
SP  - 133
EP  - 147
VL  - 8
IS  - 1
DO  - 10.1007/s40145-018-0301-5
UR  - https://hdl.handle.net/21.15107/rcub_dais_5271
ER  - 
@article{
author = "Filipović, Suzana and Pavlović, Vera P. and Mitrić, Miodrag and Lević, Steva and Mitrović, Nebojša and Maričić, Aleksa and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2019",
abstract = "Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method (co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.",
publisher = "Springer",
journal = "Journal of Advanced Ceramics",
title = "Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure",
pages = "133-147",
volume = "8",
number = "1",
doi = "10.1007/s40145-018-0301-5",
url = "https://hdl.handle.net/21.15107/rcub_dais_5271"
}
Filipović, S., Pavlović, V. P., Mitrić, M., Lević, S., Mitrović, N., Maričić, A., Vlahović, B.,& Pavlović, V. B.. (2019). Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure. in Journal of Advanced Ceramics
Springer., 8(1), 133-147.
https://doi.org/10.1007/s40145-018-0301-5
https://hdl.handle.net/21.15107/rcub_dais_5271
Filipović S, Pavlović VP, Mitrić M, Lević S, Mitrović N, Maričić A, Vlahović B, Pavlović VB. Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure. in Journal of Advanced Ceramics. 2019;8(1):133-147.
doi:10.1007/s40145-018-0301-5
https://hdl.handle.net/21.15107/rcub_dais_5271 .
Filipović, Suzana, Pavlović, Vera P., Mitrić, Miodrag, Lević, Steva, Mitrović, Nebojša, Maričić, Aleksa, Vlahović, Branislav, Pavlović, Vladimir B., "Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure" in Journal of Advanced Ceramics, 8, no. 1 (2019):133-147,
https://doi.org/10.1007/s40145-018-0301-5 .,
https://hdl.handle.net/21.15107/rcub_dais_5271 .
1
4
7
6

The effect of ball milling on properties of sintered manganese-doped alumina

Filipović, Suzana; Obradović, Nina; Marković, Smilja; Mitrić, Miodrag; Balać, Igor; Đorđević, Antonije; Pavlović, Vladimir B.

(Elsevier, 2019)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Balać, Igor
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119302596
UR  - http://dais.sanu.ac.rs/123456789/6951
AB  - Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - The effect of ball milling on properties of sintered manganese-doped alumina
SP  - 2533
EP  - 2540
VL  - 30
IS  - 11
DO  - 10.1016/j.apt.2019.07.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_6951
ER  - 
@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Mitrić, Miodrag and Balać, Igor and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "The effect of ball milling on properties of sintered manganese-doped alumina",
pages = "2533-2540",
volume = "30",
number = "11",
doi = "10.1016/j.apt.2019.07.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_6951"
}
Filipović, S., Obradović, N., Marković, S., Mitrić, M., Balać, I., Đorđević, A.,& Pavlović, V. B.. (2019). The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology
Elsevier., 30(11), 2533-2540.
https://doi.org/10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_6951
Filipović S, Obradović N, Marković S, Mitrić M, Balać I, Đorđević A, Pavlović VB. The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology. 2019;30(11):2533-2540.
doi:10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_6951 .
Filipović, Suzana, Obradović, Nina, Marković, Smilja, Mitrić, Miodrag, Balać, Igor, Đorđević, Antonije, Pavlović, Vladimir B., "The effect of ball milling on properties of sintered manganese-doped alumina" in Advanced Powder Technology, 30, no. 11 (2019):2533-2540,
https://doi.org/10.1016/j.apt.2019.07.033 .,
https://hdl.handle.net/21.15107/rcub_dais_6951 .
1
3
3

The effect of ball milling on properties of sintered manganese-doped alumina

Filipović, Suzana; Obradović, Nina; Marković, Smilja; Mitrić, Miodrag; Balać, Igor; Đorđević, Antonije; Pavlović, Vladimir B.

(Elsevier, 2019)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Mitrić, Miodrag
AU  - Balać, Igor
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119302596
UR  - http://dais.sanu.ac.rs/123456789/7027
AB  - Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - The effect of ball milling on properties of sintered manganese-doped alumina
SP  - 2533
EP  - 2540
VL  - 30
IS  - 11
DO  - 10.1016/j.apt.2019.07.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_7027
ER  - 
@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Mitrić, Miodrag and Balać, Igor and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Alumina-based compounds have many technological applications and attract great attention even after decades of investigation, due to their good chemical, electrical, and mechanical properties. A mixture of several alumina modifications (α-, κ-, γ-Al2O3) doped with 1 wt% of Mn2O3 was used for this experiment. The powder was mechanically activated for 60 min in an ethanol medium. After compaction, green bodies were sintered in the temperature range from 1200 to 1400 °C. Microstructures of the obtained specimens were investigated by scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The influence of morphological changes on electrical and mechanical properties was examined in detail. We have developed a test fixture and corresponding software for measurement of the relative dielectric permittivity and the loss tangent of ceramic specimens. This new method overcomes the problems of dimensions and shape of samples, as well as the problem of applying silver paste. The accuracy is around 2% for ε'r and 0.003 for tanδ. We demonstrate that the mechanical activation (MA) has the dominant influence on lowering the characteristic temperatures and microstructure development, which further leads to increased permittivity and tensile strength.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "The effect of ball milling on properties of sintered manganese-doped alumina",
pages = "2533-2540",
volume = "30",
number = "11",
doi = "10.1016/j.apt.2019.07.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_7027"
}
Filipović, S., Obradović, N., Marković, S., Mitrić, M., Balać, I., Đorđević, A.,& Pavlović, V. B.. (2019). The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology
Elsevier., 30(11), 2533-2540.
https://doi.org/10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_7027
Filipović S, Obradović N, Marković S, Mitrić M, Balać I, Đorđević A, Pavlović VB. The effect of ball milling on properties of sintered manganese-doped alumina. in Advanced Powder Technology. 2019;30(11):2533-2540.
doi:10.1016/j.apt.2019.07.033
https://hdl.handle.net/21.15107/rcub_dais_7027 .
Filipović, Suzana, Obradović, Nina, Marković, Smilja, Mitrić, Miodrag, Balać, Igor, Đorđević, Antonije, Pavlović, Vladimir B., "The effect of ball milling on properties of sintered manganese-doped alumina" in Advanced Powder Technology, 30, no. 11 (2019):2533-2540,
https://doi.org/10.1016/j.apt.2019.07.033 .,
https://hdl.handle.net/21.15107/rcub_dais_7027 .
1
3
3

Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Đorđević, Pavle; Rogan, Jelena; Pavlović, Vladimir B.

(The Ceramic Society of Japan, 2019)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Đorđević, Pavle
AU  - Rogan, Jelena
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7050
AB  - Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by solid-state reaction between MgO and a-Al2O3 powders. Mechanical activation was used to increase the reactivity of powders and decrease the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 30, 60, 90, and 120 minutes. The resulting powders were characterized to determine the effect of activation on surface area, particle size, and crystallinity. Mechanical activation decreased particle size, increased surface area, and increased the width of peaks in x-ray diffraction. Dilatometry was used to monitor densification behavior up to 1500 °C. For non-activated powders, sintering started at approximately 1400 °C, while for activated powders, the onset temperature decreased to about 1340 °C. Mechanical activation is an efficient method to improve the densification behaviour of MgAl2O4 produced from mixed oxide powders.
PB  - The Ceramic Society of Japan
C3  - The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan
T1  - Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel
SP  - 30-B1C-S13-14
UR  - https://hdl.handle.net/21.15107/rcub_dais_7050
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Đorđević, Pavle and Rogan, Jelena and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by solid-state reaction between MgO and a-Al2O3 powders. Mechanical activation was used to increase the reactivity of powders and decrease the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 30, 60, 90, and 120 minutes. The resulting powders were characterized to determine the effect of activation on surface area, particle size, and crystallinity. Mechanical activation decreased particle size, increased surface area, and increased the width of peaks in x-ray diffraction. Dilatometry was used to monitor densification behavior up to 1500 °C. For non-activated powders, sintering started at approximately 1400 °C, while for activated powders, the onset temperature decreased to about 1340 °C. Mechanical activation is an efficient method to improve the densification behaviour of MgAl2O4 produced from mixed oxide powders.",
publisher = "The Ceramic Society of Japan",
journal = "The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan",
title = "Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel",
pages = "30-B1C-S13-14",
url = "https://hdl.handle.net/21.15107/rcub_dais_7050"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Đorđević, P., Rogan, J.,& Pavlović, V. B.. (2019). Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel. in The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan
The Ceramic Society of Japan., 30-B1C-S13-14.
https://hdl.handle.net/21.15107/rcub_dais_7050
Obradović N, Fahrenholtz WG, Filipović S, Đorđević P, Rogan J, Pavlović VB. Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel. in The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan. 2019;:30-B1C-S13-14.
https://hdl.handle.net/21.15107/rcub_dais_7050 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Đorđević, Pavle, Rogan, Jelena, Pavlović, Vladimir B., "Effect of Mechanical Activation on the Densification Behavior of MgAl2O4 Spinel" in The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13), October 27 - November 1, 2019, Okinawa Convention Center, Japan (2019):30-B1C-S13-14,
https://hdl.handle.net/21.15107/rcub_dais_7050 .

The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Kosanović, Darko; Dapčević, Aleksandra; Rogan, Jelena; Pavlović, Vladimir B.

(Societa ceramica italiana, 2019)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, Aleksandra
AU  - Rogan, Jelena
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7022
AB  - Magnesium aluminate, MgAl2O4, and other alumina-based spinels are refractory ceramics with high hardness and resistance to chemical attack while also being possible microwave dielectrics. Pure MgAl2O4 can be optically transparent when fully dense. Spinels exhibit inversion, which results in disorder among occupancy of A and B site cations. The goal of this study was to examine the effects of mechanical activation and composition on the temperature required for spinel formation and the site occupancy in the resulting spinel. 
MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3. The starting powders were mixed by ball milling to homogenize the powders without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1500 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influence of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. 
The main results of this study were that mechanical activation for 60 minutes initiated a mechano-chemical reaction, and resulted in spinel formation at much lower temperatures than within non-activated powders. Microstructures of ceramics sintered below 1400 oC indicated that final stage sintering started at much lower temperatures for activated samples than for non-activated samples. 
Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Societa ceramica italiana
PB  - Politecnico di Torino
C3  - Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
SP  - 262
EP  - 262
UR  - https://hdl.handle.net/21.15107/rcub_dais_7022
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, Aleksandra and Rogan, Jelena and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4, and other alumina-based spinels are refractory ceramics with high hardness and resistance to chemical attack while also being possible microwave dielectrics. Pure MgAl2O4 can be optically transparent when fully dense. Spinels exhibit inversion, which results in disorder among occupancy of A and B site cations. The goal of this study was to examine the effects of mechanical activation and composition on the temperature required for spinel formation and the site occupancy in the resulting spinel. 
MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3. The starting powders were mixed by ball milling to homogenize the powders without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1500 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influence of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. 
The main results of this study were that mechanical activation for 60 minutes initiated a mechano-chemical reaction, and resulted in spinel formation at much lower temperatures than within non-activated powders. Microstructures of ceramics sintered below 1400 oC indicated that final stage sintering started at much lower temperatures for activated samples than for non-activated samples. 
Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Societa ceramica italiana, Politecnico di Torino",
journal = "Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "262-262",
url = "https://hdl.handle.net/21.15107/rcub_dais_7022"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Rogan, J.,& Pavlović, V. B.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019
Societa ceramica italiana., 262-262.
https://hdl.handle.net/21.15107/rcub_dais_7022
Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Rogan J, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019. 2019;:262-262.
https://hdl.handle.net/21.15107/rcub_dais_7022 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, Aleksandra, Rogan, Jelena, Pavlović, Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Abstract Book / XVI Conference and Exhibition of the European Ceramic Society XVI ECerS Conference, Torino, 16-20 June 2019 (2019):262-262,
https://hdl.handle.net/21.15107/rcub_dais_7022 .

Characterization of MgAl2O4 sintered ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Đorđević, Pavle; Marković, Smilja; Rogan, Jelena; Vulić, Predrag J.; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2019)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Đorđević, Pavle
AU  - Marković, Smilja
AU  - Rogan, Jelena
AU  - Vulić, Predrag J.
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6980
AB  - Single crystalline phase MgAl2O4 is made from the predetermined composition of MgO-Al2O3 powder mixture by using ball-milling. Mixtures of MgO and Al2O3 are treated in planetary ball mill for 30, 60, 90 and 120 minutes, in air. The aim of this experiment was to examine phase composition, microstructure, and densification behavior of all sintered samples and to find out which sample has the best features for further use. After sintering in dilatometer at 1500 °C, XRD patterns and SEM images were recorded. The results show that mechanical activation is an efficient method to improve the densification behavior of MgAl2O4 sintered specimens. With the prolonged milling time, densities increased, reaching the maximum value of 2.8 g/cm3 for sample activated 120 minutes.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
T1  - Characterization of MgAl2O4 sintered ceramics
SP  - 54
EP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_dais_6980
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Đorđević, Pavle and Marković, Smilja and Rogan, Jelena and Vulić, Predrag J. and Pavlović, Vladimir B.",
year = "2019",
abstract = "Single crystalline phase MgAl2O4 is made from the predetermined composition of MgO-Al2O3 powder mixture by using ball-milling. Mixtures of MgO and Al2O3 are treated in planetary ball mill for 30, 60, 90 and 120 minutes, in air. The aim of this experiment was to examine phase composition, microstructure, and densification behavior of all sintered samples and to find out which sample has the best features for further use. After sintering in dilatometer at 1500 °C, XRD patterns and SEM images were recorded. The results show that mechanical activation is an efficient method to improve the densification behavior of MgAl2O4 sintered specimens. With the prolonged milling time, densities increased, reaching the maximum value of 2.8 g/cm3 for sample activated 120 minutes.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019",
title = "Characterization of MgAl2O4 sintered ceramics",
pages = "54-54",
url = "https://hdl.handle.net/21.15107/rcub_dais_6980"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Đorđević, P., Marković, S., Rogan, J., Vulić, P. J.,& Pavlović, V. B.. (2019). Characterization of MgAl2O4 sintered ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
Belgrade : Serbian Ceramic Society., 54-54.
https://hdl.handle.net/21.15107/rcub_dais_6980
Obradović N, Fahrenholtz WG, Filipović S, Đorđević P, Marković S, Rogan J, Vulić PJ, Pavlović VB. Characterization of MgAl2O4 sintered ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019. 2019;:54-54.
https://hdl.handle.net/21.15107/rcub_dais_6980 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Đorđević, Pavle, Marković, Smilja, Rogan, Jelena, Vulić, Predrag J., Pavlović, Vladimir B., "Characterization of MgAl2O4 sintered ceramics" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019 (2019):54-54,
https://hdl.handle.net/21.15107/rcub_dais_6980 .