TY  - CONF
AU  - Swanson, R.
AU  - Kosanović, Darko
AU  - Chapman, M.
AU  - Uchic, M. D.
AU  - Fahrenholtz, William G.
AU  - McCormack, S. J.
PY  - 2024
UR  - https://dais.sanu.ac.rs/123456789/16382
AB  - Standard ultra-high temperature ceramic (UHTC) manufacturing results in components with large differences in properties due to variability in microstructural “critical flaw” distributions. Critical flaws can be any irregularity in a component, such as a secondary phase, cracks, pores, etc. This is problematic when designing reproducible UHTC components. The goal of this project is to understand how these critical flaws evolve during hot pressing of ZrB2 (a UHTC) by examining them in 3D. This study incorporates 3D imaging such as (i) preliminary in-situ high-temperature pressureless sintering X-ray µ-CT, (ii) ex-situ X-ray µ-CT, and (iii) 3D electron imaging and backscattered diffraction data collected at different stages of densification. 3D microstructure statistics along with unique observations of individual pore and secondary phase evolution will be presented. This data is brought together to give a holistic view of the densification of ZrB2 during hot pressing at multiple length scales. This data will be incorporated into a process-structure-property (PSP) database for statistical modeling to reduce uncertainty during ZrB2 processing.
PB  - American Ceramic Society
C3  - Abstract Book / 48th International Conference & Exposition on Advanced Ceramics and Composites, January 28–February 2, 2024, Daytona Beach, Florida
T1  - High-fidelity 3D microstructural characterization of ZrB2 during hot-pressing (Invited)
UR  - https://hdl.handle.net/21.15107/rcub_dais_16382
ER  - 

@conference{
author = "Swanson, R. and Kosanović, Darko and Chapman, M. and Uchic, M. D. and Fahrenholtz, William G. and McCormack, S. J.",
year = "2024",
abstract = "Standard ultra-high temperature ceramic (UHTC) manufacturing results in components with large differences in properties due to variability in microstructural “critical flaw” distributions. Critical flaws can be any irregularity in a component, such as a secondary phase, cracks, pores, etc. This is problematic when designing reproducible UHTC components. The goal of this project is to understand how these critical flaws evolve during hot pressing of ZrB2 (a UHTC) by examining them in 3D. This study incorporates 3D imaging such as (i) preliminary in-situ high-temperature pressureless sintering X-ray µ-CT, (ii) ex-situ X-ray µ-CT, and (iii) 3D electron imaging and backscattered diffraction data collected at different stages of densification. 3D microstructure statistics along with unique observations of individual pore and secondary phase evolution will be presented. This data is brought together to give a holistic view of the densification of ZrB2 during hot pressing at multiple length scales. This data will be incorporated into a process-structure-property (PSP) database for statistical modeling to reduce uncertainty during ZrB2 processing.",
publisher = "American Ceramic Society",
journal = "Abstract Book / 48th International Conference & Exposition on Advanced Ceramics and Composites, January 28–February 2, 2024, Daytona Beach, Florida",
title = "High-fidelity 3D microstructural characterization of ZrB2 during hot-pressing (Invited)",
url = "https://hdl.handle.net/21.15107/rcub_dais_16382"
}

Swanson, R., Kosanović, D., Chapman, M., Uchic, M. D., Fahrenholtz, W. G.,& McCormack, S. J.. (2024). High-fidelity 3D microstructural characterization of ZrB2 during hot-pressing (Invited). in Abstract Book / 48th International Conference & Exposition on Advanced Ceramics and Composites, January 28–February 2, 2024, Daytona Beach, Florida
American Ceramic Society..
https://hdl.handle.net/21.15107/rcub_dais_16382

Swanson R, Kosanović D, Chapman M, Uchic MD, Fahrenholtz WG, McCormack SJ. High-fidelity 3D microstructural characterization of ZrB2 during hot-pressing (Invited). in Abstract Book / 48th International Conference & Exposition on Advanced Ceramics and Composites, January 28–February 2, 2024, Daytona Beach, Florida. 2024;.
https://hdl.handle.net/21.15107/rcub_dais_16382 .

Swanson, R., Kosanović, Darko, Chapman, M., Uchic, M. D., Fahrenholtz, William G., McCormack, S. J., "High-fidelity 3D microstructural characterization of ZrB2 during hot-pressing (Invited)" in Abstract Book / 48th International Conference & Exposition on Advanced Ceramics and Composites, January 28–February 2, 2024, Daytona Beach, Florida (2024),
https://hdl.handle.net/21.15107/rcub_dais_16382 .

TY  - JOUR
AU  - Peleš Tadić, Adriana
AU  - Blagojević, Vladimir A.
AU  - Stojanović, Dušica
AU  - Ostojić, Sanja B.
AU  - Tasić, Nikola
AU  - Kosanović, Darko
AU  - Uskoković, Petar
AU  - Pavlović, Vladimir B.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/13436
AB  - Poly(vinylidenefluoride)–ZnO (PVDF–ZnO) nanocomposites with mechanically activated ZnO nanoparticle fillers were investigated using thermal and mechanical analysis and AFM and PFM. Differential scanning calorimetry (DSC) investigated the effect of ZnO nanoparticles on the crystallinity of the polymer, under controlled heating and cooling. Atomic force (AFM) microscopy was used to record the surfaces of the samples. Nanocomposite surface roughness shows the presence of the different phases inside of the matrix, where rough samples contain a higher proportion of the β phase. PFM was performed to investigate the piezoresponse of the composites. Nanoidentation showed that the mechanical activation of the filler (ZnO) increases the Young modulus with the activation time. Molecular simulations in periodic systems (PVDF–ZnO spherical nanocluster and nanocylinder composite) were used to investigate the influence of particle size and shape on the Young modulus of different phases of PVDF.
PB  - Elsevier BV
T2  - Materials Science and Engineering: B
T1  - Nanomechanical properties of PVDF–ZnO polymer nanocomposite
SP  - 116126
VL  - 287
DO  - 10.1016/j.mseb.2022.116126
UR  - https://hdl.handle.net/21.15107/rcub_dais_13436
ER  - 

@article{
author = "Peleš Tadić, Adriana and Blagojević, Vladimir A. and Stojanović, Dušica and Ostojić, Sanja B. and Tasić, Nikola and Kosanović, Darko and Uskoković, Petar and Pavlović, Vladimir B.",
year = "2023",
abstract = "Poly(vinylidenefluoride)–ZnO (PVDF–ZnO) nanocomposites with mechanically activated ZnO nanoparticle fillers were investigated using thermal and mechanical analysis and AFM and PFM. Differential scanning calorimetry (DSC) investigated the effect of ZnO nanoparticles on the crystallinity of the polymer, under controlled heating and cooling. Atomic force (AFM) microscopy was used to record the surfaces of the samples. Nanocomposite surface roughness shows the presence of the different phases inside of the matrix, where rough samples contain a higher proportion of the β phase. PFM was performed to investigate the piezoresponse of the composites. Nanoidentation showed that the mechanical activation of the filler (ZnO) increases the Young modulus with the activation time. Molecular simulations in periodic systems (PVDF–ZnO spherical nanocluster and nanocylinder composite) were used to investigate the influence of particle size and shape on the Young modulus of different phases of PVDF.",
publisher = "Elsevier BV",
journal = "Materials Science and Engineering: B",
title = "Nanomechanical properties of PVDF–ZnO polymer nanocomposite",
pages = "116126",
volume = "287",
doi = "10.1016/j.mseb.2022.116126",
url = "https://hdl.handle.net/21.15107/rcub_dais_13436"
}

Peleš Tadić, A., Blagojević, V. A., Stojanović, D., Ostojić, S. B., Tasić, N., Kosanović, D., Uskoković, P.,& Pavlović, V. B.. (2023). Nanomechanical properties of PVDF–ZnO polymer nanocomposite. in Materials Science and Engineering: B
Elsevier BV., 287, 116126.
https://doi.org/10.1016/j.mseb.2022.116126
https://hdl.handle.net/21.15107/rcub_dais_13436

Peleš Tadić A, Blagojević VA, Stojanović D, Ostojić SB, Tasić N, Kosanović D, Uskoković P, Pavlović VB. Nanomechanical properties of PVDF–ZnO polymer nanocomposite. in Materials Science and Engineering: B. 2023;287:116126.
doi:10.1016/j.mseb.2022.116126
https://hdl.handle.net/21.15107/rcub_dais_13436 .

Peleš Tadić, Adriana, Blagojević, Vladimir A., Stojanović, Dušica, Ostojić, Sanja B., Tasić, Nikola, Kosanović, Darko, Uskoković, Petar, Pavlović, Vladimir B., "Nanomechanical properties of PVDF–ZnO polymer nanocomposite" in Materials Science and Engineering: B, 287 (2023):116126,
https://doi.org/10.1016/j.mseb.2022.116126 .,
https://hdl.handle.net/21.15107/rcub_dais_13436 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Feng, Lun
AU  - Filipović, Suzana
AU  - Mirković, Miljana
AU  - Kosanović, Darko
AU  - Rogan, Jelena
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14877
AB  - Zirconium carbide ceramics were prepared by carbothermal reduction of ZrO2 and C that were mixed by high-energy ball milling. Powders were milled for times from 0 to 120 min in air. As milling time increased, the surface area of the powders increased, indicating significant particle size reduction. Milled powders were reacted at 1600 °C and then densified by spark plasma sintering at 2000 °C, which was sufficient to convert the starting powders to zirconium carbide. Unmilled powders did not reach full density. Milled powders reached full density, but ZrO2 impurities were found for specimens prepared from powders milled for 60 and 120 min. Microstructure analysis showed that grain size was less than 2 µm for ceramics produced from powder milled for 15 min. Based on densification onset temperature and impurity levels, a milling time of 15 min gives the best balance of particle size reduction to promote densification while minimizing impurity levels.
PB  - Elsevier BV
T2  - Journal of the European Ceramic Society
T1  - Effect of mechanical activation on carbothermal synthesis and densification of ZrC
SP  - 7306
EP  - 7313
VL  - 43
DO  - 10.1016/j.jeurceramsoc.2023.08.007
UR  - https://hdl.handle.net/21.15107/rcub_dais_14877
ER  - 

@article{
author = "Obradović, Nina and Feng, Lun and Filipović, Suzana and Mirković, Miljana and Kosanović, Darko and Rogan, Jelena and Fahrenholtz, William G.",
year = "2023",
abstract = "Zirconium carbide ceramics were prepared by carbothermal reduction of ZrO2 and C that were mixed by high-energy ball milling. Powders were milled for times from 0 to 120 min in air. As milling time increased, the surface area of the powders increased, indicating significant particle size reduction. Milled powders were reacted at 1600 °C and then densified by spark plasma sintering at 2000 °C, which was sufficient to convert the starting powders to zirconium carbide. Unmilled powders did not reach full density. Milled powders reached full density, but ZrO2 impurities were found for specimens prepared from powders milled for 60 and 120 min. Microstructure analysis showed that grain size was less than 2 µm for ceramics produced from powder milled for 15 min. Based on densification onset temperature and impurity levels, a milling time of 15 min gives the best balance of particle size reduction to promote densification while minimizing impurity levels.",
publisher = "Elsevier BV",
journal = "Journal of the European Ceramic Society",
title = "Effect of mechanical activation on carbothermal synthesis and densification of ZrC",
pages = "7306-7313",
volume = "43",
doi = "10.1016/j.jeurceramsoc.2023.08.007",
url = "https://hdl.handle.net/21.15107/rcub_dais_14877"
}

Obradović, N., Feng, L., Filipović, S., Mirković, M., Kosanović, D., Rogan, J.,& Fahrenholtz, W. G.. (2023). Effect of mechanical activation on carbothermal synthesis and densification of ZrC. in Journal of the European Ceramic Society
Elsevier BV., 43, 7306-7313.
https://doi.org/10.1016/j.jeurceramsoc.2023.08.007
https://hdl.handle.net/21.15107/rcub_dais_14877

Obradović N, Feng L, Filipović S, Mirković M, Kosanović D, Rogan J, Fahrenholtz WG. Effect of mechanical activation on carbothermal synthesis and densification of ZrC. in Journal of the European Ceramic Society. 2023;43:7306-7313.
doi:10.1016/j.jeurceramsoc.2023.08.007
https://hdl.handle.net/21.15107/rcub_dais_14877 .

Obradović, Nina, Feng, Lun, Filipović, Suzana, Mirković, Miljana, Kosanović, Darko, Rogan, Jelena, Fahrenholtz, William G., "Effect of mechanical activation on carbothermal synthesis and densification of ZrC" in Journal of the European Ceramic Society, 43 (2023):7306-7313,
https://doi.org/10.1016/j.jeurceramsoc.2023.08.007 .,
https://hdl.handle.net/21.15107/rcub_dais_14877 .

TY  - JOUR
AU  - Peleš Tadić, Adriana
AU  - Blagojević, Vladimir A.
AU  - Stojanović, Dušica
AU  - Ostojić, Sanja B.
AU  - Tasić, Nikola
AU  - Kosanović, Darko
AU  - Uskoković, Petar
AU  - Pavlović, Vladimir B.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/13560
AB  - Poly(vinylidenefluoride)–ZnO (PVDF–ZnO) nanocomposites with mechanically activated ZnO nanoparticle fillers were investigated using thermal and mechanical analysis and AFM and PFM. Differential scanning calorimetry (DSC) investigated the effect of ZnO nanoparticles on the crystallinity of the polymer, under controlled heating and cooling. Atomic force (AFM) microscopy was used to record the surfaces of the samples. Nanocomposite surface roughness shows the presence of the different phases inside of the matrix, where rough samples contain a higher proportion of the β phase. PFM was performed to investigate the piezoresponse of the composites. Nanoidentation showed that the mechanical activation of the filler (ZnO) increases the Young modulus with the activation time. Molecular simulations in periodic systems (PVDF–ZnO spherical nanocluster and nanocylinder composite) were used to investigate the influence of particle size and shape on the Young modulus of different phases of PVDF.
PB  - Elsevier BV
T2  - Materials Science and Engineering: B
T1  - Nanomechanical properties of PVDF–ZnO polymer nanocomposite
SP  - 116126
VL  - 287
DO  - 10.1016/j.mseb.2022.116126
UR  - https://hdl.handle.net/21.15107/rcub_dais_13436
ER  - 

@article{
author = "Peleš Tadić, Adriana and Blagojević, Vladimir A. and Stojanović, Dušica and Ostojić, Sanja B. and Tasić, Nikola and Kosanović, Darko and Uskoković, Petar and Pavlović, Vladimir B.",
year = "2023",
abstract = "Poly(vinylidenefluoride)–ZnO (PVDF–ZnO) nanocomposites with mechanically activated ZnO nanoparticle fillers were investigated using thermal and mechanical analysis and AFM and PFM. Differential scanning calorimetry (DSC) investigated the effect of ZnO nanoparticles on the crystallinity of the polymer, under controlled heating and cooling. Atomic force (AFM) microscopy was used to record the surfaces of the samples. Nanocomposite surface roughness shows the presence of the different phases inside of the matrix, where rough samples contain a higher proportion of the β phase. PFM was performed to investigate the piezoresponse of the composites. Nanoidentation showed that the mechanical activation of the filler (ZnO) increases the Young modulus with the activation time. Molecular simulations in periodic systems (PVDF–ZnO spherical nanocluster and nanocylinder composite) were used to investigate the influence of particle size and shape on the Young modulus of different phases of PVDF.",
publisher = "Elsevier BV",
journal = "Materials Science and Engineering: B",
title = "Nanomechanical properties of PVDF–ZnO polymer nanocomposite",
pages = "116126",
volume = "287",
doi = "10.1016/j.mseb.2022.116126",
url = "https://hdl.handle.net/21.15107/rcub_dais_13436"
}

Peleš Tadić, A., Blagojević, V. A., Stojanović, D., Ostojić, S. B., Tasić, N., Kosanović, D., Uskoković, P.,& Pavlović, V. B.. (2023). Nanomechanical properties of PVDF–ZnO polymer nanocomposite. in Materials Science and Engineering: B
Elsevier BV., 287, 116126.
https://doi.org/10.1016/j.mseb.2022.116126
https://hdl.handle.net/21.15107/rcub_dais_13436

Peleš Tadić A, Blagojević VA, Stojanović D, Ostojić SB, Tasić N, Kosanović D, Uskoković P, Pavlović VB. Nanomechanical properties of PVDF–ZnO polymer nanocomposite. in Materials Science and Engineering: B. 2023;287:116126.
doi:10.1016/j.mseb.2022.116126
https://hdl.handle.net/21.15107/rcub_dais_13436 .

Peleš Tadić, Adriana, Blagojević, Vladimir A., Stojanović, Dušica, Ostojić, Sanja B., Tasić, Nikola, Kosanović, Darko, Uskoković, Petar, Pavlović, Vladimir B., "Nanomechanical properties of PVDF–ZnO polymer nanocomposite" in Materials Science and Engineering: B, 287 (2023):116126,
https://doi.org/10.1016/j.mseb.2022.116126 .,
https://hdl.handle.net/21.15107/rcub_dais_13436 .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Blagojević, Vladimir
AU  - Aleksić, Stanko
AU  - Živojinović, Jelena
AU  - Peleš Tadić, Adriana
AU  - Pavlović, Vladimir B.
AU  - Obradović, Nina
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14971
AB  - BZT ceramics was prepared by using fine powder mixture of BaCO3, TiO2 and ZrO2 in the respective molar ratio to form Ba(Zr0.10Ti0.90)O3 via solid state reaction at elevated temperature. The prepared BZT was milled in the planetary ball mill from 0-120 min to achieve different powder grades from micron to nano-sized particles. After the powder characterization by XRD and SEM the samples were pressed in disc shape and sintered at different temperatures from 1100-1350°C in the air. The sintered samples were characterized by SEM and their density and average grain size was determined and presented vs. sintering temperature and powder grades (milling time). After that the silver epoxy electrodes were deposited on sintered disc samples. The disc samples capacity and resistivity were measured at low frequency region from 1 Hz to 200 kHz using low frequency impedance analyzer. The sintering temperatures and powder grades were used as parameters. Finally the specific resistance ρ, dielectric constant (ε' + jε") and tgδ where determined from the impedance measurements. The behavior of electronic properties where analyzed e.g. the relaxation effect of the space charge (inter-granular electric charges) vs. sintering temperature and ceramic grades. The results obtained were compared with best literature data for the losses in BZT ceramics at low frequencies.
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Electronic properties of BZT nano-ceramic grades at low frequency region
SP  - 413
EP  - 423
VL  - 55
IS  - 3
DO  - 10.2298/SOS230717043K
UR  - https://hdl.handle.net/21.15107/rcub_dais_14971
ER  - 

@article{
author = "Kosanović, Darko and Blagojević, Vladimir and Aleksić, Stanko and Živojinović, Jelena and Peleš Tadić, Adriana and Pavlović, Vladimir B. and Obradović, Nina",
year = "2023",
abstract = "BZT ceramics was prepared by using fine powder mixture of BaCO3, TiO2 and ZrO2 in the respective molar ratio to form Ba(Zr0.10Ti0.90)O3 via solid state reaction at elevated temperature. The prepared BZT was milled in the planetary ball mill from 0-120 min to achieve different powder grades from micron to nano-sized particles. After the powder characterization by XRD and SEM the samples were pressed in disc shape and sintered at different temperatures from 1100-1350°C in the air. The sintered samples were characterized by SEM and their density and average grain size was determined and presented vs. sintering temperature and powder grades (milling time). After that the silver epoxy electrodes were deposited on sintered disc samples. The disc samples capacity and resistivity were measured at low frequency region from 1 Hz to 200 kHz using low frequency impedance analyzer. The sintering temperatures and powder grades were used as parameters. Finally the specific resistance ρ, dielectric constant (ε' + jε") and tgδ where determined from the impedance measurements. The behavior of electronic properties where analyzed e.g. the relaxation effect of the space charge (inter-granular electric charges) vs. sintering temperature and ceramic grades. The results obtained were compared with best literature data for the losses in BZT ceramics at low frequencies.",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Electronic properties of BZT nano-ceramic grades at low frequency region",
pages = "413-423",
volume = "55",
number = "3",
doi = "10.2298/SOS230717043K",
url = "https://hdl.handle.net/21.15107/rcub_dais_14971"
}

Kosanović, D., Blagojević, V., Aleksić, S., Živojinović, J., Peleš Tadić, A., Pavlović, V. B.,& Obradović, N.. (2023). Electronic properties of BZT nano-ceramic grades at low frequency region. in Science of Sintering
Belgrade : ETRAN., 55(3), 413-423.
https://doi.org/10.2298/SOS230717043K
https://hdl.handle.net/21.15107/rcub_dais_14971

Kosanović D, Blagojević V, Aleksić S, Živojinović J, Peleš Tadić A, Pavlović VB, Obradović N. Electronic properties of BZT nano-ceramic grades at low frequency region. in Science of Sintering. 2023;55(3):413-423.
doi:10.2298/SOS230717043K
https://hdl.handle.net/21.15107/rcub_dais_14971 .

Kosanović, Darko, Blagojević, Vladimir, Aleksić, Stanko, Živojinović, Jelena, Peleš Tadić, Adriana, Pavlović, Vladimir B., Obradović, Nina, "Electronic properties of BZT nano-ceramic grades at low frequency region" in Science of Sintering, 55, no. 3 (2023):413-423,
https://doi.org/10.2298/SOS230717043K .,
https://hdl.handle.net/21.15107/rcub_dais_14971 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Feng, Lun
AU  - Filipović, Suzana
AU  - Mirković, Miljana
AU  - Kosanović, Darko
AU  - Rogan, Jelena
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14890
AB  - Zirconium carbide ceramics were prepared by carbothermal reduction of ZrO2 and C that were mixed by high-energy ball milling. Powders were milled for times from 0 to 120 min in air. As milling time increased, the surface area of the powders increased, indicating significant particle size reduction. Milled powders were reacted at 1600 °C and then densified by spark plasma sintering at 2000 °C, which was sufficient to convert the starting powders to zirconium carbide. Unmilled powders did not reach full density. Milled powders reached full density, but ZrO2 impurities were found for specimens prepared from powders milled for 60 and 120 min. Microstructure analysis showed that grain size was less than 2 µm for ceramics produced from powder milled for 15 min. Based on densification onset temperature and impurity levels, a milling time of 15 min gives the best balance of particle size reduction to promote densification while minimizing impurity levels.
PB  - Elsevier BV
T2  - Journal of the European Ceramic Society
T1  - Effect of mechanical activation on carbothermal synthesis and densification of ZrC
SP  - 7306
EP  - 7313
DO  - 10.1016/j.jeurceramsoc.2023.08.007
UR  - https://hdl.handle.net/21.15107/rcub_dais_14890
ER  - 

@article{
author = "Obradović, Nina and Feng, Lun and Filipović, Suzana and Mirković, Miljana and Kosanović, Darko and Rogan, Jelena and Fahrenholtz, William G.",
year = "2023",
abstract = "Zirconium carbide ceramics were prepared by carbothermal reduction of ZrO2 and C that were mixed by high-energy ball milling. Powders were milled for times from 0 to 120 min in air. As milling time increased, the surface area of the powders increased, indicating significant particle size reduction. Milled powders were reacted at 1600 °C and then densified by spark plasma sintering at 2000 °C, which was sufficient to convert the starting powders to zirconium carbide. Unmilled powders did not reach full density. Milled powders reached full density, but ZrO2 impurities were found for specimens prepared from powders milled for 60 and 120 min. Microstructure analysis showed that grain size was less than 2 µm for ceramics produced from powder milled for 15 min. Based on densification onset temperature and impurity levels, a milling time of 15 min gives the best balance of particle size reduction to promote densification while minimizing impurity levels.",
publisher = "Elsevier BV",
journal = "Journal of the European Ceramic Society",
title = "Effect of mechanical activation on carbothermal synthesis and densification of ZrC",
pages = "7306-7313",
doi = "10.1016/j.jeurceramsoc.2023.08.007",
url = "https://hdl.handle.net/21.15107/rcub_dais_14890"
}

Obradović, N., Feng, L., Filipović, S., Mirković, M., Kosanović, D., Rogan, J.,& Fahrenholtz, W. G.. (2023). Effect of mechanical activation on carbothermal synthesis and densification of ZrC. in Journal of the European Ceramic Society
Elsevier BV., 7306-7313.
https://doi.org/10.1016/j.jeurceramsoc.2023.08.007
https://hdl.handle.net/21.15107/rcub_dais_14890

Obradović N, Feng L, Filipović S, Mirković M, Kosanović D, Rogan J, Fahrenholtz WG. Effect of mechanical activation on carbothermal synthesis and densification of ZrC. in Journal of the European Ceramic Society. 2023;:7306-7313.
doi:10.1016/j.jeurceramsoc.2023.08.007
https://hdl.handle.net/21.15107/rcub_dais_14890 .

Obradović, Nina, Feng, Lun, Filipović, Suzana, Mirković, Miljana, Kosanović, Darko, Rogan, Jelena, Fahrenholtz, William G., "Effect of mechanical activation on carbothermal synthesis and densification of ZrC" in Journal of the European Ceramic Society (2023):7306-7313,
https://doi.org/10.1016/j.jeurceramsoc.2023.08.007 .,
https://hdl.handle.net/21.15107/rcub_dais_14890 .

TY  - CONF
AU  - Kosanović, Darko
AU  - Fahrenholtz, William G.
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Watts, Jeremy L.
AU  - Hilmas, G. E.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/15009
AB  - The thermal properties of zirconium diboride (ZrB2) ceramics with tungsten additions of up to 5 wt% were characterized up to 2000°C. Densification was promoted by the addition of 0.5 wt% carbon. ZrB2 ceramics were prepared from commercially available powder by hot pressing. The crystalline phases present were determined by x-ray diffraction. The microstructure and density change as a result of the addition of tungsten, but this does not affect much the thermal behavior of ZrB2 at room and elevated temperatures. Thermal diffusivity at 200°C decreased from 0.158 cm2/s for nominally pure ZrB2 to 0.149 cm2/s for ZrB2 with 5 wt% Tungsten carbide (WC). The thermal diffusivity decreased with increasing temperature, reaching a value of 0.145 cm2/s at 2000°C for ZrB2 with 5 wt% Tungsten carbide (WC). Heat capacity, unlike thermal diffusivity, did not change during thermal cycling. Thermal conductivity, which was calculated from thermal diffusivity, heat capacity, and density, was as high as 77.9 W/(m·K) at 2000°C for ZrB2 with 5 wt% Tungsten carbide (WC). Any level of Tungsten carbide (WC) contamination reduces thermal conductivity. Properties, including hardness, oxygen content, elastic modulus, strength were measured and will be discussed.
PB  - Belgrade : University of Belgrade - Faculty of Mechanical Engineering
C3  - Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia
T1  - Elevated Temperature Thermal Properties of ZrB2 with Tungsten Additions
SP  - 79
UR  - https://hdl.handle.net/21.15107/rcub_dais_15009
ER  - 

@conference{
author = "Kosanović, Darko and Fahrenholtz, William G. and Obradović, Nina and Filipović, Suzana and Watts, Jeremy L. and Hilmas, G. E.",
year = "2023",
abstract = "The thermal properties of zirconium diboride (ZrB2) ceramics with tungsten additions of up to 5 wt% were characterized up to 2000°C. Densification was promoted by the addition of 0.5 wt% carbon. ZrB2 ceramics were prepared from commercially available powder by hot pressing. The crystalline phases present were determined by x-ray diffraction. The microstructure and density change as a result of the addition of tungsten, but this does not affect much the thermal behavior of ZrB2 at room and elevated temperatures. Thermal diffusivity at 200°C decreased from 0.158 cm2/s for nominally pure ZrB2 to 0.149 cm2/s for ZrB2 with 5 wt% Tungsten carbide (WC). The thermal diffusivity decreased with increasing temperature, reaching a value of 0.145 cm2/s at 2000°C for ZrB2 with 5 wt% Tungsten carbide (WC). Heat capacity, unlike thermal diffusivity, did not change during thermal cycling. Thermal conductivity, which was calculated from thermal diffusivity, heat capacity, and density, was as high as 77.9 W/(m·K) at 2000°C for ZrB2 with 5 wt% Tungsten carbide (WC). Any level of Tungsten carbide (WC) contamination reduces thermal conductivity. Properties, including hardness, oxygen content, elastic modulus, strength were measured and will be discussed.",
publisher = "Belgrade : University of Belgrade - Faculty of Mechanical Engineering",
journal = "Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia",
title = "Elevated Temperature Thermal Properties of ZrB2 with Tungsten Additions",
pages = "79",
url = "https://hdl.handle.net/21.15107/rcub_dais_15009"
}

Kosanović, D., Fahrenholtz, W. G., Obradović, N., Filipović, S., Watts, J. L.,& Hilmas, G. E.. (2023). Elevated Temperature Thermal Properties of ZrB2 with Tungsten Additions. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia
Belgrade : University of Belgrade - Faculty of Mechanical Engineering., 79.
https://hdl.handle.net/21.15107/rcub_dais_15009

Kosanović D, Fahrenholtz WG, Obradović N, Filipović S, Watts JL, Hilmas GE. Elevated Temperature Thermal Properties of ZrB2 with Tungsten Additions. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia. 2023;:79.
https://hdl.handle.net/21.15107/rcub_dais_15009 .

Kosanović, Darko, Fahrenholtz, William G., Obradović, Nina, Filipović, Suzana, Watts, Jeremy L., Hilmas, G. E., "Elevated Temperature Thermal Properties of ZrB2 with Tungsten Additions" in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia (2023):79,
https://hdl.handle.net/21.15107/rcub_dais_15009 .

TY  - CONF
AU  - Obradović, Nina
AU  - Feng, Lun
AU  - Filipović, Suzana
AU  - Mirković, M.
AU  - Kosanović, Darko
AU  - Živojinović, Jelena
AU  - Rogan, Jelena
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/15008
AB  - Mechanical activation represents a very useful technique for powder processing prior to sintering process. First of all, it makes powders homogenized, leads to attrition of powder particles, and makes powder mixtures more reactive. Secondly, it can lead to mechano-chemical reaction, and finally, lowering of sintering time and temperature. Mixtures of ZrO2 and C were mechanically activated by high-energy ball milling. Powders were milled for times from 0 to 120 minutes in air atmosphere. Mechanically activated powder mixtures were characterized by various techniques, such as particle size analysis (PSA), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and diffraction scanning calorimetry along with thermo gravimetry (DSC-TGA). As milling time increased, surface area of powders increased, indicating significant particle size reduction. Mechanical activation for 15 minutes provides the best balance between particle size reduction and reactivity for the powders.
PB  - Belgrade : University of Belgrade - Faculty of Mechanical Engineering
C3  - Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia
T1  - Characterization of mechanically activated ZrO2-C powder mixtures
SP  - 78
UR  - https://hdl.handle.net/21.15107/rcub_dais_15008
ER  - 

@conference{
author = "Obradović, Nina and Feng, Lun and Filipović, Suzana and Mirković, M. and Kosanović, Darko and Živojinović, Jelena and Rogan, Jelena and Fahrenholtz, William G.",
year = "2023",
abstract = "Mechanical activation represents a very useful technique for powder processing prior to sintering process. First of all, it makes powders homogenized, leads to attrition of powder particles, and makes powder mixtures more reactive. Secondly, it can lead to mechano-chemical reaction, and finally, lowering of sintering time and temperature. Mixtures of ZrO2 and C were mechanically activated by high-energy ball milling. Powders were milled for times from 0 to 120 minutes in air atmosphere. Mechanically activated powder mixtures were characterized by various techniques, such as particle size analysis (PSA), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and diffraction scanning calorimetry along with thermo gravimetry (DSC-TGA). As milling time increased, surface area of powders increased, indicating significant particle size reduction. Mechanical activation for 15 minutes provides the best balance between particle size reduction and reactivity for the powders.",
publisher = "Belgrade : University of Belgrade - Faculty of Mechanical Engineering",
journal = "Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia",
title = "Characterization of mechanically activated ZrO2-C powder mixtures",
pages = "78",
url = "https://hdl.handle.net/21.15107/rcub_dais_15008"
}

Obradović, N., Feng, L., Filipović, S., Mirković, M., Kosanović, D., Živojinović, J., Rogan, J.,& Fahrenholtz, W. G.. (2023). Characterization of mechanically activated ZrO2-C powder mixtures. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia
Belgrade : University of Belgrade - Faculty of Mechanical Engineering., 78.
https://hdl.handle.net/21.15107/rcub_dais_15008

Obradović N, Feng L, Filipović S, Mirković M, Kosanović D, Živojinović J, Rogan J, Fahrenholtz WG. Characterization of mechanically activated ZrO2-C powder mixtures. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia. 2023;:78.
https://hdl.handle.net/21.15107/rcub_dais_15008 .

Obradović, Nina, Feng, Lun, Filipović, Suzana, Mirković, M., Kosanović, Darko, Živojinović, Jelena, Rogan, Jelena, Fahrenholtz, William G., "Characterization of mechanically activated ZrO2-C powder mixtures" in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2023, 04 – 07 July 2023, Zlatibor, Serbia (2023):78,
https://hdl.handle.net/21.15107/rcub_dais_15008 .

TY  - JOUR
AU  - Živojinović, Jelena
AU  - Peleš Tadić, Adriana
AU  - Kosanović, Darko
AU  - Filipović, Suzana
AU  - Stanković, Ana
AU  - Obradović, Nina
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14970
AB  - Istraživanja predstavljena u ovom radu prate uticaj mehaničke aktivacije na strukturu smeše stroncijumtitanata (SrTiO3) sa dodatkom 6 težinskih % gvožđe(III)oksida (Fe2O3) kao aditiva. Prahovi su mehanički aktivirani u visoko-energetskom planetarnom mlinu sa volfram-karbidnim (WC) kuglicama u vremenskom intervalu od 0 do 120 minuta. Korišćena je metoda rendgenske difrakcije (XRD) radi identifikacije faznog sastava smeša, a metode skenirajuće elektronske mikroskopije (SEM) i raspodele veličine čestica (PSA) korišćene su za praćenje promene u morfologiji i raspodeli veličina čestica aktiviranih prahova. Promene u kristalnoj rešetki SrTiO3 su praćene i ramanskom spektrometrijom, a izračunata je i širina zabranjene zone uzoraka. Cilj mehaničke aktivacije prahova je sniženje temperature i skraćivanje vremena procesa sinterovanja radi dobijanja finalnog proizvoda.
AB  - The authors investigated the influence of mechanical activation on the structure of SrTiO3 mixture with 6 wt.% Fe2O3. Powders were mechanically activated in a planetary ball mill with WC balls in time intervals from 0 to 120 minutes. XRD method was used for the identification of phase structure, while SEM and PSA were employed for monitoring of changes in morphology and particle size distribution. Structural changes were followed by Raman spectroscopy, and band gap values were calculated as well. The purpose of mechanical activation is lowering the temperature and time of sintering in the process of obtaining the final product.
PB  - Beograd : Savez inženjera i tehničara Srbije
T2  - Tehnika
T1  - Uticaj mehaničke aktivacije na smešu SrTiO3 i Fe2O3 kao aditiva
SP  - 395
EP  - 400
VL  - 78
IS  - 4
DO  - 10.5937/tehnika2304395Z
UR  - https://hdl.handle.net/21.15107/rcub_dais_14970
ER  - 

@article{
author = "Živojinović, Jelena and Peleš Tadić, Adriana and Kosanović, Darko and Filipović, Suzana and Stanković, Ana and Obradović, Nina",
year = "2023",
abstract = "Istraživanja predstavljena u ovom radu prate uticaj mehaničke aktivacije na strukturu smeše stroncijumtitanata (SrTiO3) sa dodatkom 6 težinskih % gvožđe(III)oksida (Fe2O3) kao aditiva. Prahovi su mehanički aktivirani u visoko-energetskom planetarnom mlinu sa volfram-karbidnim (WC) kuglicama u vremenskom intervalu od 0 do 120 minuta. Korišćena je metoda rendgenske difrakcije (XRD) radi identifikacije faznog sastava smeša, a metode skenirajuće elektronske mikroskopije (SEM) i raspodele veličine čestica (PSA) korišćene su za praćenje promene u morfologiji i raspodeli veličina čestica aktiviranih prahova. Promene u kristalnoj rešetki SrTiO3 su praćene i ramanskom spektrometrijom, a izračunata je i širina zabranjene zone uzoraka. Cilj mehaničke aktivacije prahova je sniženje temperature i skraćivanje vremena procesa sinterovanja radi dobijanja finalnog proizvoda., The authors investigated the influence of mechanical activation on the structure of SrTiO3 mixture with 6 wt.% Fe2O3. Powders were mechanically activated in a planetary ball mill with WC balls in time intervals from 0 to 120 minutes. XRD method was used for the identification of phase structure, while SEM and PSA were employed for monitoring of changes in morphology and particle size distribution. Structural changes were followed by Raman spectroscopy, and band gap values were calculated as well. The purpose of mechanical activation is lowering the temperature and time of sintering in the process of obtaining the final product.",
publisher = "Beograd : Savez inženjera i tehničara Srbije",
journal = "Tehnika",
title = "Uticaj mehaničke aktivacije na smešu SrTiO3 i Fe2O3 kao aditiva",
pages = "395-400",
volume = "78",
number = "4",
doi = "10.5937/tehnika2304395Z",
url = "https://hdl.handle.net/21.15107/rcub_dais_14970"
}

Živojinović, J., Peleš Tadić, A., Kosanović, D., Filipović, S., Stanković, A.,& Obradović, N.. (2023). Uticaj mehaničke aktivacije na smešu SrTiO3 i Fe2O3 kao aditiva. in Tehnika
Beograd : Savez inženjera i tehničara Srbije., 78(4), 395-400.
https://doi.org/10.5937/tehnika2304395Z
https://hdl.handle.net/21.15107/rcub_dais_14970

Živojinović J, Peleš Tadić A, Kosanović D, Filipović S, Stanković A, Obradović N. Uticaj mehaničke aktivacije na smešu SrTiO3 i Fe2O3 kao aditiva. in Tehnika. 2023;78(4):395-400.
doi:10.5937/tehnika2304395Z
https://hdl.handle.net/21.15107/rcub_dais_14970 .

Živojinović, Jelena, Peleš Tadić, Adriana, Kosanović, Darko, Filipović, Suzana, Stanković, Ana, Obradović, Nina, "Uticaj mehaničke aktivacije na smešu SrTiO3 i Fe2O3 kao aditiva" in Tehnika, 78, no. 4 (2023):395-400,
https://doi.org/10.5937/tehnika2304395Z .,
https://hdl.handle.net/21.15107/rcub_dais_14970 .

TY  - CONF
AU  - Kosanović, Darko
AU  - Filipović, Suzana
AU  - Trajković, Isaak
AU  - Obradović, Nina
AU  - Brune, Paul M.
AU  - Hilmas, Gregory E.
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/15006
AB  - Zirconium diboride(ZrB2) belongs to the group of ultrahigh temperature ceramics (UHTCs) because of its high melting point (3250°C). Due to its excellent properties, such as the melting temperature, high strength and hardness, high thermal and electrical conductivities relative to other ceramics and good corrosion resistance to molten metals, it has attracted great interest from materials scientists. Fully dense ZrB2 ceramics were successfully obtained by hot pressing at 2150oC for 10 minutes. Prior to hot pressing, commercially available ZrB2 powder was ball milled for 24hr with ZrB2 media. Carbon was added as a densification aid in the amount of 0.5 wt.% using phenolic resin. For mechanical testing, three different methods were compared. Three point bending was performed in air at room temperature and the obtained strength was 546±55 MPa. Four-point bend strengths were measured under same conditions resulting in strengths of 476±112 MPa. Finally, the fracture toughness of pure ZrB2 ceramics was determined by the chevron notched beam method to be 4.1 ± 0.5 MPa•m1/2. The obtained results of mechanical testing make this ceramic material applicable as cutting tools, and parts for hypersonic aerospace vehicles.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
T1  - Mechanical properties of zirconium diboride ceramics
SP  - 84
UR  - https://hdl.handle.net/21.15107/rcub_dais_15006
ER  - 

@conference{
author = "Kosanović, Darko and Filipović, Suzana and Trajković, Isaak and Obradović, Nina and Brune, Paul M. and Hilmas, Gregory E. and Fahrenholtz, William G.",
year = "2023",
abstract = "Zirconium diboride(ZrB2) belongs to the group of ultrahigh temperature ceramics (UHTCs) because of its high melting point (3250°C). Due to its excellent properties, such as the melting temperature, high strength and hardness, high thermal and electrical conductivities relative to other ceramics and good corrosion resistance to molten metals, it has attracted great interest from materials scientists. Fully dense ZrB2 ceramics were successfully obtained by hot pressing at 2150oC for 10 minutes. Prior to hot pressing, commercially available ZrB2 powder was ball milled for 24hr with ZrB2 media. Carbon was added as a densification aid in the amount of 0.5 wt.% using phenolic resin. For mechanical testing, three different methods were compared. Three point bending was performed in air at room temperature and the obtained strength was 546±55 MPa. Four-point bend strengths were measured under same conditions resulting in strengths of 476±112 MPa. Finally, the fracture toughness of pure ZrB2 ceramics was determined by the chevron notched beam method to be 4.1 ± 0.5 MPa•m1/2. The obtained results of mechanical testing make this ceramic material applicable as cutting tools, and parts for hypersonic aerospace vehicles.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023",
title = "Mechanical properties of zirconium diboride ceramics",
pages = "84",
url = "https://hdl.handle.net/21.15107/rcub_dais_15006"
}

Kosanović, D., Filipović, S., Trajković, I., Obradović, N., Brune, P. M., Hilmas, G. E.,& Fahrenholtz, W. G.. (2023). Mechanical properties of zirconium diboride ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
Belgrade : Serbian Ceramic Society., 84.
https://hdl.handle.net/21.15107/rcub_dais_15006

Kosanović D, Filipović S, Trajković I, Obradović N, Brune PM, Hilmas GE, Fahrenholtz WG. Mechanical properties of zirconium diboride ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023. 2023;:84.
https://hdl.handle.net/21.15107/rcub_dais_15006 .

Kosanović, Darko, Filipović, Suzana, Trajković, Isaak, Obradović, Nina, Brune, Paul M., Hilmas, Gregory E., Fahrenholtz, William G., "Mechanical properties of zirconium diboride ceramics" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023 (2023):84,
https://hdl.handle.net/21.15107/rcub_dais_15006 .

TY  - CONF
AU  - Živojinović, Jelena
AU  - Peleš Tadić, Adriana
AU  - Kosanović, Darko
AU  - Tadić, Nenad
AU  - Vasiljević, Zorka Ž.
AU  - Lević, Steva
AU  - Obradović, Nina
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/15007
AB  - Iron-doped strontium-titanate (SrTiO3) powders with various iron(III) oxide (Fe2O3) weight percentages (1.5, 3 and 6 wt%) were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 min). A systematic investigation by XRD, SEM and Raman spectroscopy has been undertaken to evaluate the role of dopant on the microstructural and morphological study of the perovskite oxide obtained. The optical properties of the different iron-doped and activated Fe-SrTiO3 powders have been also evaluated. The results demonstrated that Fe has been substituted into the lattice and surface layers of particles of SrTiO3 powders and the absorption edge shifted to higher wavelength values with increasing activation time and dopant weight percentage. The lowest value of the band gap (Eg=3.20 eV) was registered for the longest activation (120 min) and the highest weight percentage of dopant (6 wt%). Combining doping with mechanical activation, led to lower values of Eg and that fact could be used in subsequent studies to make Fe-SrTiO3 more suitable photocatalysts.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
T1  - Influence of Fe Doping on the Crystal Structure and Optical Properties of Mechanically Activated SrTiO3 Powders
SP  - 51
EP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_dais_15007
ER  - 

@conference{
author = "Živojinović, Jelena and Peleš Tadić, Adriana and Kosanović, Darko and Tadić, Nenad and Vasiljević, Zorka Ž. and Lević, Steva and Obradović, Nina",
year = "2023",
abstract = "Iron-doped strontium-titanate (SrTiO3) powders with various iron(III) oxide (Fe2O3) weight percentages (1.5, 3 and 6 wt%) were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 min). A systematic investigation by XRD, SEM and Raman spectroscopy has been undertaken to evaluate the role of dopant on the microstructural and morphological study of the perovskite oxide obtained. The optical properties of the different iron-doped and activated Fe-SrTiO3 powders have been also evaluated. The results demonstrated that Fe has been substituted into the lattice and surface layers of particles of SrTiO3 powders and the absorption edge shifted to higher wavelength values with increasing activation time and dopant weight percentage. The lowest value of the band gap (Eg=3.20 eV) was registered for the longest activation (120 min) and the highest weight percentage of dopant (6 wt%). Combining doping with mechanical activation, led to lower values of Eg and that fact could be used in subsequent studies to make Fe-SrTiO3 more suitable photocatalysts.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023",
title = "Influence of Fe Doping on the Crystal Structure and Optical Properties of Mechanically Activated SrTiO3 Powders",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_dais_15007"
}

Živojinović, J., Peleš Tadić, A., Kosanović, D., Tadić, N., Vasiljević, Z. Ž., Lević, S.,& Obradović, N.. (2023). Influence of Fe Doping on the Crystal Structure and Optical Properties of Mechanically Activated SrTiO3 Powders. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023
Belgrade : Serbian Ceramic Society., 51-51.
https://hdl.handle.net/21.15107/rcub_dais_15007

Živojinović J, Peleš Tadić A, Kosanović D, Tadić N, Vasiljević ZŽ, Lević S, Obradović N. Influence of Fe Doping on the Crystal Structure and Optical Properties of Mechanically Activated SrTiO3 Powders. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023. 2023;:51-51.
https://hdl.handle.net/21.15107/rcub_dais_15007 .

Živojinović, Jelena, Peleš Tadić, Adriana, Kosanović, Darko, Tadić, Nenad, Vasiljević, Zorka Ž., Lević, Steva, Obradović, Nina, "Influence of Fe Doping on the Crystal Structure and Optical Properties of Mechanically Activated SrTiO3 Powders" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application XI New Frontiers in Multifunctional Material Science and Processing, Serbian Academy of Sciences and Art Serbia, Belgrade,18-20.September 2023 (2023):51-51,
https://hdl.handle.net/21.15107/rcub_dais_15007 .

TY  - CONF
AU  - Kosanović, Darko
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14968
AB  - Tungsten carbide (WC) additions, up to 5 wt%, were added to commercial zirconium diboride (ZrB2) powder. Densification was promoted by the addition of 0.5 wt% carbon. The powders with WC additions were hot-pressed at 2150°C with a pressure of 32 MPa. Bulk densities were measured by the Archimedes method. Scanning electron microscopy was used to determine grain size and morphology, as well as whether any second phases were present. The crystalline phases present were determined by x-ray diffraction. Properties, including hardness, elastic modulus, strength, and thermal conductivity, were measured and will be discussed.
PB  - American Ceramic Society
C3  - Abstract Book / 47th International Conference and Exposition on Advanced Ceramics and Composites, January 22-27, 2023 Daytona Beach, Florida
T1  - Effect of WC on the Microstructure and Properties of Zirconium Diboride
SP  - 96
UR  - https://hdl.handle.net/21.15107/rcub_dais_14968
ER  - 

@conference{
author = "Kosanović, Darko",
year = "2023",
abstract = "Tungsten carbide (WC) additions, up to 5 wt%, were added to commercial zirconium diboride (ZrB2) powder. Densification was promoted by the addition of 0.5 wt% carbon. The powders with WC additions were hot-pressed at 2150°C with a pressure of 32 MPa. Bulk densities were measured by the Archimedes method. Scanning electron microscopy was used to determine grain size and morphology, as well as whether any second phases were present. The crystalline phases present were determined by x-ray diffraction. Properties, including hardness, elastic modulus, strength, and thermal conductivity, were measured and will be discussed.",
publisher = "American Ceramic Society",
journal = "Abstract Book / 47th International Conference and Exposition on Advanced Ceramics and Composites, January 22-27, 2023 Daytona Beach, Florida",
title = "Effect of WC on the Microstructure and Properties of Zirconium Diboride",
pages = "96",
url = "https://hdl.handle.net/21.15107/rcub_dais_14968"
}

Kosanović, D.. (2023). Effect of WC on the Microstructure and Properties of Zirconium Diboride. in Abstract Book / 47th International Conference and Exposition on Advanced Ceramics and Composites, January 22-27, 2023 Daytona Beach, Florida
American Ceramic Society., 96.
https://hdl.handle.net/21.15107/rcub_dais_14968

Kosanović D. Effect of WC on the Microstructure and Properties of Zirconium Diboride. in Abstract Book / 47th International Conference and Exposition on Advanced Ceramics and Composites, January 22-27, 2023 Daytona Beach, Florida. 2023;:96.
https://hdl.handle.net/21.15107/rcub_dais_14968 .

Kosanović, Darko, "Effect of WC on the Microstructure and Properties of Zirconium Diboride" in Abstract Book / 47th International Conference and Exposition on Advanced Ceramics and Composites, January 22-27, 2023 Daytona Beach, Florida (2023):96,
https://hdl.handle.net/21.15107/rcub_dais_14968 .

TY  - JOUR
AU  - Živojinović, Jelena
AU  - Kosanović, Darko
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vera P.
AU  - Tadić, Nenad
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13510
AB  - In this study, microstructure evolution and dielectric properties of SrTiO3 ceramic have been investigated, whereby mechanical activation of SrTiO3 powders was used to modify the functional properties of ceramic materials. Microstructural SEM analysis of SrTiO3 ceramics showed that the increase in mechanical activation time results in less porous samples. Raman spectroscopy indicated changes in the broadening and asymmetry of the TO2 mode with a change in the time of mechanical activation. TO2 mode showed a Fano asymmetry due to its interaction with polarization fluctuations in polar micro-regions, which are a consequence of the presence of oxygen vacancies caused by activation. The maximum value of dielectric permittivity was observed in the sample activated for 10 min. Also, the sample activated for 10 min exhibits relatively low values of loss tangent, compared to the other mechanically activated samples, providing the best overall dielectric performance compared to other samples.
T2  - Science of Sintering
T1  - Dielectric Properties of Mechanically Activated Strontium Titanate Ceramics
SP  - 401
EP  - 414
VL  - 54
IS  - 4
DO  - 10.2298/SOS2204401Z
UR  - https://hdl.handle.net/21.15107/rcub_dais_13510
ER  - 

@article{
author = "Živojinović, Jelena and Kosanović, Darko and Blagojević, Vladimir A. and Pavlović, Vera P. and Tadić, Nenad and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2022",
abstract = "In this study, microstructure evolution and dielectric properties of SrTiO3 ceramic have been investigated, whereby mechanical activation of SrTiO3 powders was used to modify the functional properties of ceramic materials. Microstructural SEM analysis of SrTiO3 ceramics showed that the increase in mechanical activation time results in less porous samples. Raman spectroscopy indicated changes in the broadening and asymmetry of the TO2 mode with a change in the time of mechanical activation. TO2 mode showed a Fano asymmetry due to its interaction with polarization fluctuations in polar micro-regions, which are a consequence of the presence of oxygen vacancies caused by activation. The maximum value of dielectric permittivity was observed in the sample activated for 10 min. Also, the sample activated for 10 min exhibits relatively low values of loss tangent, compared to the other mechanically activated samples, providing the best overall dielectric performance compared to other samples.",
journal = "Science of Sintering",
title = "Dielectric Properties of Mechanically Activated Strontium Titanate Ceramics",
pages = "401-414",
volume = "54",
number = "4",
doi = "10.2298/SOS2204401Z",
url = "https://hdl.handle.net/21.15107/rcub_dais_13510"
}

Živojinović, J., Kosanović, D., Blagojević, V. A., Pavlović, V. P., Tadić, N., Vlahović, B.,& Pavlović, V. B.. (2022). Dielectric Properties of Mechanically Activated Strontium Titanate Ceramics. in Science of Sintering, 54(4), 401-414.
https://doi.org/10.2298/SOS2204401Z
https://hdl.handle.net/21.15107/rcub_dais_13510

Živojinović J, Kosanović D, Blagojević VA, Pavlović VP, Tadić N, Vlahović B, Pavlović VB. Dielectric Properties of Mechanically Activated Strontium Titanate Ceramics. in Science of Sintering. 2022;54(4):401-414.
doi:10.2298/SOS2204401Z
https://hdl.handle.net/21.15107/rcub_dais_13510 .

Živojinović, Jelena, Kosanović, Darko, Blagojević, Vladimir A., Pavlović, Vera P., Tadić, Nenad, Vlahović, Branislav, Pavlović, Vladimir B., "Dielectric Properties of Mechanically Activated Strontium Titanate Ceramics" in Science of Sintering, 54, no. 4 (2022):401-414,
https://doi.org/10.2298/SOS2204401Z .,
https://hdl.handle.net/21.15107/rcub_dais_13510 .

TY  - CONF
AU  - Živojinović, Jelena
AU  - Kosanović, Darko
AU  - Pavlović, Vera P.
AU  - Tadić, Nenad
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13596
AB  - The influence of Mn incorporation into the Sr and Ti sites of SrTiO3 ceramics on the structure, microstructure and dielectric tunability was studied. Manganese doped SrTiO3 ceramics with various manganese dioxide weight percentages (1.5, 3 and 6 wt %) were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 minutes). According to Ritveld's analysis it was found that the size of the crystallite in doped activated SrTiO3 ceramics is smaller than the size of the crystallite in undoped ceramics. This lower degree of crystallinity is a consequence of additional distortion of the crystal structure due to ion substitution. SEM analysis showed that with increasing dopant concentration in the sample, at the same time as a time of mechanical activation, the grain size decreases, which is explained by the increasingly dominant incorporation of Mn4+ ions at sites of Ti4+ ions. On the Raman spectra of doped ceramic samples, the appearance of a peak at 750 cm-1 was observed, its change in intensity with the increase of dopant concentration indicates the incorporation of dopant in the SrTiO3 lattice. It was stated that mechanical activation leads to a more pronounced increase in the intensity of the mentioned peak, i.e. that activation leads to effectively higher incorporation of dopant into the strontium-titanate lattice. Higher values of relative dielectric permittivity of doped SrTiO3 ceramics were observed for 1.5 wt %, in relation to inactivated and activated undoped ceramics. Based on all previous analysis, it is estimated that this can be related not only to higher sample densities but also to the contribution of Mn2+ ion incorporation at Sr2+ ion positions in the lattice. Based on all the above, the optimal electrical properties of SrTiO3 ceramics can be achieved by the appropriate choice of mechanical activation time and dopant concentration.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
T1  - Study of influence of Mn dopant on dielectric response of SrTiO3 ceramics
SP  - 131
EP  - 131
UR  - https://hdl.handle.net/21.15107/rcub_dais_13596
ER  - 

@conference{
author = "Živojinović, Jelena and Kosanović, Darko and Pavlović, Vera P. and Tadić, Nenad and Pavlović, Vladimir B.",
year = "2022",
abstract = "The influence of Mn incorporation into the Sr and Ti sites of SrTiO3 ceramics on the structure, microstructure and dielectric tunability was studied. Manganese doped SrTiO3 ceramics with various manganese dioxide weight percentages (1.5, 3 and 6 wt %) were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 minutes). According to Ritveld's analysis it was found that the size of the crystallite in doped activated SrTiO3 ceramics is smaller than the size of the crystallite in undoped ceramics. This lower degree of crystallinity is a consequence of additional distortion of the crystal structure due to ion substitution. SEM analysis showed that with increasing dopant concentration in the sample, at the same time as a time of mechanical activation, the grain size decreases, which is explained by the increasingly dominant incorporation of Mn4+ ions at sites of Ti4+ ions. On the Raman spectra of doped ceramic samples, the appearance of a peak at 750 cm-1 was observed, its change in intensity with the increase of dopant concentration indicates the incorporation of dopant in the SrTiO3 lattice. It was stated that mechanical activation leads to a more pronounced increase in the intensity of the mentioned peak, i.e. that activation leads to effectively higher incorporation of dopant into the strontium-titanate lattice. Higher values of relative dielectric permittivity of doped SrTiO3 ceramics were observed for 1.5 wt %, in relation to inactivated and activated undoped ceramics. Based on all previous analysis, it is estimated that this can be related not only to higher sample densities but also to the contribution of Mn2+ ion incorporation at Sr2+ ion positions in the lattice. Based on all the above, the optimal electrical properties of SrTiO3 ceramics can be achieved by the appropriate choice of mechanical activation time and dopant concentration.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022",
title = "Study of influence of Mn dopant on dielectric response of SrTiO3 ceramics",
pages = "131-131",
url = "https://hdl.handle.net/21.15107/rcub_dais_13596"
}

Živojinović, J., Kosanović, D., Pavlović, V. P., Tadić, N.,& Pavlović, V. B.. (2022). Study of influence of Mn dopant on dielectric response of SrTiO3 ceramics. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022
Belgrade : Materials Research Society of Serbia., 131-131.
https://hdl.handle.net/21.15107/rcub_dais_13596

Živojinović J, Kosanović D, Pavlović VP, Tadić N, Pavlović VB. Study of influence of Mn dopant on dielectric response of SrTiO3 ceramics. in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022. 2022;:131-131.
https://hdl.handle.net/21.15107/rcub_dais_13596 .

Živojinović, Jelena, Kosanović, Darko, Pavlović, Vera P., Tadić, Nenad, Pavlović, Vladimir B., "Study of influence of Mn dopant on dielectric response of SrTiO3 ceramics" in Program and The Book of abstracts / Twenty-third Annual Conference YUCOMAT 2022 & Twelfth World Round Table Conference on Sintering XII WRTCS 2022, Herceg Novi, Montenegro, August 29 - September 2, 2022 (2022):131-131,
https://hdl.handle.net/21.15107/rcub_dais_13596 .

TY  - CONF
AU  - Živojinović, Jelena
AU  - Kosanović, Darko
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vera P.
AU  - Ćirković, Jovana
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13600
AB  - Manganese doped SrTiO3 powders with various manganese dioxide weight percentages in the range of 1.5, 3 and 6 wp% were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 minutes). A systematic investigation by X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analisys (PSA), Brunauer-Emmett-Teller (BET) methods and Raman spectroscopy has been undertaken to evaluate the role of dopants on the microstructural and morphological study of the perovskite oxide obtained. The optical properties of the different manganese doped and activated SrTiO3 powders have been also evaluated. Mn insertion in SrTiO3 is discussed considering the possibility for Mn ions to occupy both Ti4+ and Sr2+ sites as well as manganese segregation and Mn incorporation-related non-homogeneities. The results demonstrated that Mn has substituted into the lattice and surface layers of the particles of SrTiO3 powders and the absorption onset shifted to higher values of wavelengths with increasing time of activation and dopant concentration. The lowest value of the band gap (Eg=3.10 eV) was registered with the longest activation for 120 minutes and the highest concentration of dopant (6 wp%). Combining doping with mechanical activation lower values of band gap can be achieved and that fact could be used in subsequent studies to make Mn-SrTiO3 more suitable visible-light photocatalysts.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor, Serbia
T1  - Influence of MN doping on the evolution of microstructure and optical properties of mechanically activated SrTiO3 powders
SP  - 82
EP  - 82
UR  - https://hdl.handle.net/21.15107/rcub_dais_13600
ER  - 

@conference{
author = "Živojinović, Jelena and Kosanović, Darko and Blagojević, Vladimir A. and Pavlović, Vera P. and Ćirković, Jovana and Pavlović, Vladimir B.",
year = "2022",
abstract = "Manganese doped SrTiO3 powders with various manganese dioxide weight percentages in the range of 1.5, 3 and 6 wp% were prepared by a solid-state method in the presence of mechanical activation (10, 30 and 120 minutes). A systematic investigation by X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analisys (PSA), Brunauer-Emmett-Teller (BET) methods and Raman spectroscopy has been undertaken to evaluate the role of dopants on the microstructural and morphological study of the perovskite oxide obtained. The optical properties of the different manganese doped and activated SrTiO3 powders have been also evaluated. Mn insertion in SrTiO3 is discussed considering the possibility for Mn ions to occupy both Ti4+ and Sr2+ sites as well as manganese segregation and Mn incorporation-related non-homogeneities. The results demonstrated that Mn has substituted into the lattice and surface layers of the particles of SrTiO3 powders and the absorption onset shifted to higher values of wavelengths with increasing time of activation and dopant concentration. The lowest value of the band gap (Eg=3.10 eV) was registered with the longest activation for 120 minutes and the highest concentration of dopant (6 wp%). Combining doping with mechanical activation lower values of band gap can be achieved and that fact could be used in subsequent studies to make Mn-SrTiO3 more suitable visible-light photocatalysts.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor, Serbia",
title = "Influence of MN doping on the evolution of microstructure and optical properties of mechanically activated SrTiO3 powders",
pages = "82-82",
url = "https://hdl.handle.net/21.15107/rcub_dais_13600"
}

Živojinović, J., Kosanović, D., Blagojević, V. A., Pavlović, V. P., Ćirković, J.,& Pavlović, V. B.. (2022). Influence of MN doping on the evolution of microstructure and optical properties of mechanically activated SrTiO3 powders. in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 82-82.
https://hdl.handle.net/21.15107/rcub_dais_13600

Živojinović J, Kosanović D, Blagojević VA, Pavlović VP, Ćirković J, Pavlović VB. Influence of MN doping on the evolution of microstructure and optical properties of mechanically activated SrTiO3 powders. in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor, Serbia. 2022;:82-82.
https://hdl.handle.net/21.15107/rcub_dais_13600 .

Živojinović, Jelena, Kosanović, Darko, Blagojević, Vladimir A., Pavlović, Vera P., Ćirković, Jovana, Pavlović, Vladimir B., "Influence of MN doping on the evolution of microstructure and optical properties of mechanically activated SrTiO3 powders" in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor, Serbia (2022):82-82,
https://hdl.handle.net/21.15107/rcub_dais_13600 .

TY  - CONF
AU  - Peleš Tadić, Adriana
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13601
AB  - The research is based on the synthesis and characterization of polymer nanocomposites based on Poly(vinylidene fluoride) (PVDF) polymer and mechanically activated zinc oxide powder. In order to produce the polymer nanocomposite with enchanced electrical and mechanical properties different amount of the mechanicaly activated zinc oxide powder was used as a filler in PVDF polymer. PVDF (Mw∼530 000) was used without further purification. Mechanical activation of the powder was performed in a planetary mechanochemical activator (mill) with tungsten carbide balls. Activation times were 10 and 30 minutes. Ball to sample mass ratio was 40:1, while the rotation speed was 390 rpm. After the mentioned procedure, PVDF and nanocomposite films (50 μm) were obtained by casting the solutions into Petri dishes. The percentage of ZnO powder inside the polymer matrix was 5% for powder mechanically activated for 30 minutes, while for powders activated for 10 minutes the percentages were 2.5%, 5% and 10%. From the obtained results it can be concluded that the bigger amount of powder as a filler inside polymer matrix can be substituted with the prolonged time of mechanical activation time and have enhanced electrical properties also saving material and making the production of nanocomposites more economical.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor
T1  - Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites
SP  - 86
EP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_dais_13601
ER  - 

@conference{
author = "Peleš Tadić, Adriana and Obradović, Nina and Kosanović, Darko and Blagojević, Vladimir A. and Pavlović, Vladimir B.",
year = "2022",
abstract = "The research is based on the synthesis and characterization of polymer nanocomposites based on Poly(vinylidene fluoride) (PVDF) polymer and mechanically activated zinc oxide powder. In order to produce the polymer nanocomposite with enchanced electrical and mechanical properties different amount of the mechanicaly activated zinc oxide powder was used as a filler in PVDF polymer. PVDF (Mw∼530 000) was used without further purification. Mechanical activation of the powder was performed in a planetary mechanochemical activator (mill) with tungsten carbide balls. Activation times were 10 and 30 minutes. Ball to sample mass ratio was 40:1, while the rotation speed was 390 rpm. After the mentioned procedure, PVDF and nanocomposite films (50 μm) were obtained by casting the solutions into Petri dishes. The percentage of ZnO powder inside the polymer matrix was 5% for powder mechanically activated for 30 minutes, while for powders activated for 10 minutes the percentages were 2.5%, 5% and 10%. From the obtained results it can be concluded that the bigger amount of powder as a filler inside polymer matrix can be substituted with the prolonged time of mechanical activation time and have enhanced electrical properties also saving material and making the production of nanocomposites more economical.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor",
title = "Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites",
pages = "86-86",
url = "https://hdl.handle.net/21.15107/rcub_dais_13601"
}

Peleš Tadić, A., Obradović, N., Kosanović, D., Blagojević, V. A.,& Pavlović, V. B.. (2022). Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites. in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 86-86.
https://hdl.handle.net/21.15107/rcub_dais_13601

Peleš Tadić A, Obradović N, Kosanović D, Blagojević VA, Pavlović VB. Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites. in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor. 2022;:86-86.
https://hdl.handle.net/21.15107/rcub_dais_13601 .

Peleš Tadić, Adriana, Obradović, Nina, Kosanović, Darko, Blagojević, Vladimir A., Pavlović, Vladimir B., "Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites" in Programme [Elektronski izvor] ; and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2022, 05-08 July 2022, Zlatibor (2022):86-86,
https://hdl.handle.net/21.15107/rcub_dais_13601 .

TY  - JOUR
AU  - Reka, Arianit A.
AU  - Kosanović, Darko
AU  - Ademi, Egzon
AU  - Aggrey, Patrick
AU  - Berisha, Avni
AU  - Pavlovski, Blagoj
AU  - Jovanovski, Gligor
AU  - Rexhepi, Besnik
AU  - Jashari, Ahmed
AU  - Makreski, Petre
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13518
AB  - The raw diatomaceous earth from the vicinity of Bitola (North Macedonia) showed low bulk density (0.61–0.69 g/cm3), high-water absorption (75–81%) and porosity (66–72%). The chemical composition was determined with ICP-MS, revealing the following results for the diatomaceous earth: SiO2 (63.69 wt%), Al2O3 (11.79 wt%), Fe2O3 (5.95 wt%), MnO (0.15 wt%), TiO2 (0.65 wt%), CaO (1.51 wt%), MgO (2.24 wt%), P2O5 (0.13 wt%), K2O (1.64 wt%), Na2O (0.93 wt%), LOI (11.21 wt%). XRPD data of the examined sample of clayey diatomite mainly depicted crystalline behavior with a small presence of amorphous phase. The crystalline mineral phases mainly comprise: silica (quartz), feldspars (plagioclase), mica (muscovite), chlorites and dolomite. SEM and TEM results show cased presence of micro- and nanostructures with pores ranging from 250 to 600 nm. The clayey diatomite was sintered at three temperatures (900, 1000 and 1100ºC) for a period of 1 h. XRPD of the sintered samples at 1100ºC showed certain thermal stability and formation of new phases (mullite and tridymite) that makes the analyzed diatomaceous earth suitable for production of various types of ceramic, construction and thermal insulating materials.
T2  - Science of Sintering
T2  - Science of Sintering
T1  - Fabrication of Ceramic Monoliths from Diatomaceous Earth: Effects of Calcination Temperature on Silica Phase Transformation
VL  - 54
IS  - 4
DO  - 10.2298/SOS2204495R
UR  - https://hdl.handle.net/21.15107/rcub_dais_13518
ER  - 

@article{
author = "Reka, Arianit A. and Kosanović, Darko and Ademi, Egzon and Aggrey, Patrick and Berisha, Avni and Pavlovski, Blagoj and Jovanovski, Gligor and Rexhepi, Besnik and Jashari, Ahmed and Makreski, Petre",
year = "2022",
abstract = "The raw diatomaceous earth from the vicinity of Bitola (North Macedonia) showed low bulk density (0.61–0.69 g/cm3), high-water absorption (75–81%) and porosity (66–72%). The chemical composition was determined with ICP-MS, revealing the following results for the diatomaceous earth: SiO2 (63.69 wt%), Al2O3 (11.79 wt%), Fe2O3 (5.95 wt%), MnO (0.15 wt%), TiO2 (0.65 wt%), CaO (1.51 wt%), MgO (2.24 wt%), P2O5 (0.13 wt%), K2O (1.64 wt%), Na2O (0.93 wt%), LOI (11.21 wt%). XRPD data of the examined sample of clayey diatomite mainly depicted crystalline behavior with a small presence of amorphous phase. The crystalline mineral phases mainly comprise: silica (quartz), feldspars (plagioclase), mica (muscovite), chlorites and dolomite. SEM and TEM results show cased presence of micro- and nanostructures with pores ranging from 250 to 600 nm. The clayey diatomite was sintered at three temperatures (900, 1000 and 1100ºC) for a period of 1 h. XRPD of the sintered samples at 1100ºC showed certain thermal stability and formation of new phases (mullite and tridymite) that makes the analyzed diatomaceous earth suitable for production of various types of ceramic, construction and thermal insulating materials.",
journal = "Science of Sintering, Science of Sintering",
title = "Fabrication of Ceramic Monoliths from Diatomaceous Earth: Effects of Calcination Temperature on Silica Phase Transformation",
volume = "54",
number = "4",
doi = "10.2298/SOS2204495R",
url = "https://hdl.handle.net/21.15107/rcub_dais_13518"
}

Reka, A. A., Kosanović, D., Ademi, E., Aggrey, P., Berisha, A., Pavlovski, B., Jovanovski, G., Rexhepi, B., Jashari, A.,& Makreski, P.. (2022). Fabrication of Ceramic Monoliths from Diatomaceous Earth: Effects of Calcination Temperature on Silica Phase Transformation. in Science of Sintering, 54(4).
https://doi.org/10.2298/SOS2204495R
https://hdl.handle.net/21.15107/rcub_dais_13518

Reka AA, Kosanović D, Ademi E, Aggrey P, Berisha A, Pavlovski B, Jovanovski G, Rexhepi B, Jashari A, Makreski P. Fabrication of Ceramic Monoliths from Diatomaceous Earth: Effects of Calcination Temperature on Silica Phase Transformation. in Science of Sintering. 2022;54(4).
doi:10.2298/SOS2204495R
https://hdl.handle.net/21.15107/rcub_dais_13518 .

Reka, Arianit A., Kosanović, Darko, Ademi, Egzon, Aggrey, Patrick, Berisha, Avni, Pavlovski, Blagoj, Jovanovski, Gligor, Rexhepi, Besnik, Jashari, Ahmed, Makreski, Petre, "Fabrication of Ceramic Monoliths from Diatomaceous Earth: Effects of Calcination Temperature on Silica Phase Transformation" in Science of Sintering, 54, no. 4 (2022),
https://doi.org/10.2298/SOS2204495R .,
https://hdl.handle.net/21.15107/rcub_dais_13518 .

TY  - CONF
AU  - Živojinović, Jelena
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vera P.
AU  - Kosanović, Darko
AU  - Tadić, Nenad B.
AU  - Pavlović, Vladimir B.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12349
AB  - In recent years, a lot of interest has been shown in obtaining materials with predetermined properties. The aim is to establish a functional dependence between the synthesis parameters, structural characteristics, and properties of the material. Ceramic materials based on strontium titanate (SrTiO3) are of special interest due to their unique physical-chemical properties. Having in mind the importance of examining the influence of synthesis parameters on the process of obtaining and properties of functional electroceramic materials, and the importance of SrTiO3 as a perovskite material, the motive was to analyze and consider the influence of mechanical activation. It has been established that the time of mechanical activation (0, 10, 30, 60, 90, and 120 minutes) of SrTiO3 powders indirectly affects on electrical properties of SrTiO3 ceramics. It was noticed that in SrTiO3 ceramics the values of relative dielectric permittivity in the radio frequency range (0,3 MHz-3 GHz) are stable, which is important for the fabrication of electronic components. Microstructural SEM analysis showed that the increase in mechanical activation time results in less porous samples. It was found that the value of the relative dielectric permittivity of ceramic samples at room temperature changes following the combined effect of changes in sample density, grain size, as well as changes in the grain boundary region. The maximum value of dielectric permittivity was observed in the sample activated for 10 minutes. Also, the sample activated for 10 min exhibits relatively low values of loss tangent, compared to the other mechanically activated samples, providing the best overall dielectric performance compared to other samples.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia
T1  - The influence of mechanical activation on microstructure and dielectric properties of SrTiO3 ceramics
SP  - 80
EP  - 80
UR  - https://hdl.handle.net/21.15107/rcub_dais_12349
ER  - 

@conference{
author = "Živojinović, Jelena and Blagojević, Vladimir A. and Pavlović, Vera P. and Kosanović, Darko and Tadić, Nenad B. and Pavlović, Vladimir B.",
year = "2021",
abstract = "In recent years, a lot of interest has been shown in obtaining materials with predetermined properties. The aim is to establish a functional dependence between the synthesis parameters, structural characteristics, and properties of the material. Ceramic materials based on strontium titanate (SrTiO3) are of special interest due to their unique physical-chemical properties. Having in mind the importance of examining the influence of synthesis parameters on the process of obtaining and properties of functional electroceramic materials, and the importance of SrTiO3 as a perovskite material, the motive was to analyze and consider the influence of mechanical activation. It has been established that the time of mechanical activation (0, 10, 30, 60, 90, and 120 minutes) of SrTiO3 powders indirectly affects on electrical properties of SrTiO3 ceramics. It was noticed that in SrTiO3 ceramics the values of relative dielectric permittivity in the radio frequency range (0,3 MHz-3 GHz) are stable, which is important for the fabrication of electronic components. Microstructural SEM analysis showed that the increase in mechanical activation time results in less porous samples. It was found that the value of the relative dielectric permittivity of ceramic samples at room temperature changes following the combined effect of changes in sample density, grain size, as well as changes in the grain boundary region. The maximum value of dielectric permittivity was observed in the sample activated for 10 minutes. Also, the sample activated for 10 min exhibits relatively low values of loss tangent, compared to the other mechanically activated samples, providing the best overall dielectric performance compared to other samples.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia",
title = "The influence of mechanical activation on microstructure and dielectric properties of SrTiO3 ceramics",
pages = "80-80",
url = "https://hdl.handle.net/21.15107/rcub_dais_12349"
}

Živojinović, J., Blagojević, V. A., Pavlović, V. P., Kosanović, D., Tadić, N. B.,& Pavlović, V. B.. (2021). The influence of mechanical activation on microstructure and dielectric properties of SrTiO3 ceramics. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 80-80.
https://hdl.handle.net/21.15107/rcub_dais_12349

Živojinović J, Blagojević VA, Pavlović VP, Kosanović D, Tadić NB, Pavlović VB. The influence of mechanical activation on microstructure and dielectric properties of SrTiO3 ceramics. in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia. 2021;:80-80.
https://hdl.handle.net/21.15107/rcub_dais_12349 .

Živojinović, Jelena, Blagojević, Vladimir A., Pavlović, Vera P., Kosanović, Darko, Tadić, Nenad B., Pavlović, Vladimir B., "The influence of mechanical activation on microstructure and dielectric properties of SrTiO3 ceramics" in Programme and The Book of Abstracts / International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH 2021,29 June - 02 July 2021, Zlatibor, Serbia (2021):80-80,
https://hdl.handle.net/21.15107/rcub_dais_12349 .

TY  - CONF
AU  - Peleš Tadić, Adriana
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Petrović, J.
AU  - Blagojević, Vladimir A.
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11903
AB  - ZnO powder was mechanically activated for 10 and 30 minutes in a high energy planetary ball mill, and mixed with 2 wt% PVDF solution to obtain nanocomposite films (50 μm) by casting. ZnO powder activated for 10 and 30 minutes was used as filler. The difference in the dielectric properties for composites with the powder with prolonged time of mechanical activation was investigated, as well as the influence of ageing using dielectric measurements at higher frequencies. Dielectric measurement showed that the ageing process does not significantly affect the properties of the composites, while the prolonged activation times can be correlated with the changes in the values of the dielectric constant. The introduction of mechanically activated ZnO powders into the matrix leads to an increase in the dielectric permittivity of the polymer. Values of dielectric permittivity for different frequencies at 300 K decrease from approximately 3.1 (60 Hz) to 1.8 (30 MHz) for nanocomposite with ZnO activated for 10 minutes, while the permittivity for nanocopomosite with ZnO activated for 30 minutes permittivity was 2.6.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
T1  - Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder
SP  - 57
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_dais_11903
ER  - 

@conference{
author = "Peleš Tadić, Adriana and Obradović, Nina and Kosanović, Darko and Petrović, J. and Blagojević, Vladimir A. and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2021",
abstract = "ZnO powder was mechanically activated for 10 and 30 minutes in a high energy planetary ball mill, and mixed with 2 wt% PVDF solution to obtain nanocomposite films (50 μm) by casting. ZnO powder activated for 10 and 30 minutes was used as filler. The difference in the dielectric properties for composites with the powder with prolonged time of mechanical activation was investigated, as well as the influence of ageing using dielectric measurements at higher frequencies. Dielectric measurement showed that the ageing process does not significantly affect the properties of the composites, while the prolonged activation times can be correlated with the changes in the values of the dielectric constant. The introduction of mechanically activated ZnO powders into the matrix leads to an increase in the dielectric permittivity of the polymer. Values of dielectric permittivity for different frequencies at 300 K decrease from approximately 3.1 (60 Hz) to 1.8 (30 MHz) for nanocomposite with ZnO activated for 10 minutes, while the permittivity for nanocopomosite with ZnO activated for 30 minutes permittivity was 2.6.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021",
title = "Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_dais_11903"
}

Peleš Tadić, A., Obradović, N., Kosanović, D., Petrović, J., Blagojević, V. A., Đorđević, A.,& Pavlović, V. B.. (2021). Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
Belgrade : Serbian Ceramic Society., 57-57.
https://hdl.handle.net/21.15107/rcub_dais_11903

Peleš Tadić A, Obradović N, Kosanović D, Petrović J, Blagojević VA, Đorđević A, Pavlović VB. Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021. 2021;:57-57.
https://hdl.handle.net/21.15107/rcub_dais_11903 .

Peleš Tadić, Adriana, Obradović, Nina, Kosanović, Darko, Petrović, J., Blagojević, Vladimir A., Đorđević, Antonije, Pavlović, Vladimir B., "Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021 (2021):57-57,
https://hdl.handle.net/21.15107/rcub_dais_11903 .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Živojinović, Jelena
AU  - Vujančević, Jelena
AU  - Peleš, Adriana
AU  - Blagojević, Vladimir
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12344
AB  - The origin of dielectric properties of strontium titanate ceramics is investigated using DFT calculations in periodic system. It was determined that the main factors contributing to the increase in dielectric permittivity are: tetragonal distortion of the normally cubic lattice, and charge imbalance induced displacement of titanium center from its central position. Oxygen vacancies were determined to create significantly larger effects than other types of vacancies, like Ti and SrO. The extent of tetragonal distortion was found to be determined by oxygen vacancy distribution, rather than total concentration: relatively symmetrical distribution of oxygen vacancies resulted in smaller tetragonal distortion of the lattice, and, consequently, smaller increase in dielectric permittivity. Charge imbalance naturally destabilizes the cubic lattice, forcing the Ti-atom out of its central position, resulting in tetragonal lattice with increased dielectric permittivity. The process stabilizes the strontium titanate lattice, while increasing the c/a ratio. Therefore, the dielectric permittivity of strontium titanate can be increased by changes to the system that increase tetragonal distortion of the lattice and/or introduce additional negative charge.
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Point defects and their effect on dielectric permittivity in strontium titanate ceramics
SP  - 285
EP  - 299
VL  - 53
IS  - 3
DO  - 10.2298/SOS2103285K
UR  - https://hdl.handle.net/21.15107/rcub_dais_12344
ER  - 

@article{
author = "Kosanović, Darko and Živojinović, Jelena and Vujančević, Jelena and Peleš, Adriana and Blagojević, Vladimir",
year = "2021",
abstract = "The origin of dielectric properties of strontium titanate ceramics is investigated using DFT calculations in periodic system. It was determined that the main factors contributing to the increase in dielectric permittivity are: tetragonal distortion of the normally cubic lattice, and charge imbalance induced displacement of titanium center from its central position. Oxygen vacancies were determined to create significantly larger effects than other types of vacancies, like Ti and SrO. The extent of tetragonal distortion was found to be determined by oxygen vacancy distribution, rather than total concentration: relatively symmetrical distribution of oxygen vacancies resulted in smaller tetragonal distortion of the lattice, and, consequently, smaller increase in dielectric permittivity. Charge imbalance naturally destabilizes the cubic lattice, forcing the Ti-atom out of its central position, resulting in tetragonal lattice with increased dielectric permittivity. The process stabilizes the strontium titanate lattice, while increasing the c/a ratio. Therefore, the dielectric permittivity of strontium titanate can be increased by changes to the system that increase tetragonal distortion of the lattice and/or introduce additional negative charge.",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Point defects and their effect on dielectric permittivity in strontium titanate ceramics",
pages = "285-299",
volume = "53",
number = "3",
doi = "10.2298/SOS2103285K",
url = "https://hdl.handle.net/21.15107/rcub_dais_12344"
}

Kosanović, D., Živojinović, J., Vujančević, J., Peleš, A.,& Blagojević, V.. (2021). Point defects and their effect on dielectric permittivity in strontium titanate ceramics. in Science of Sintering
Belgrade : ETRAN., 53(3), 285-299.
https://doi.org/10.2298/SOS2103285K
https://hdl.handle.net/21.15107/rcub_dais_12344

Kosanović D, Živojinović J, Vujančević J, Peleš A, Blagojević V. Point defects and their effect on dielectric permittivity in strontium titanate ceramics. in Science of Sintering. 2021;53(3):285-299.
doi:10.2298/SOS2103285K
https://hdl.handle.net/21.15107/rcub_dais_12344 .

Kosanović, Darko, Živojinović, Jelena, Vujančević, Jelena, Peleš, Adriana, Blagojević, Vladimir, "Point defects and their effect on dielectric permittivity in strontium titanate ceramics" in Science of Sintering, 53, no. 3 (2021):285-299,
https://doi.org/10.2298/SOS2103285K .,
https://hdl.handle.net/21.15107/rcub_dais_12344 .

TY  - BOOK
AU  - Косановић, Дарко
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12573
AB  - С обзиром на то да развој савремене технике није могућ без нових ма‑ теријала, што је објективно последица достигнућа у области науке о материјалима, аутор се у овој монографији бави керамичким материјали‑ ма који већ дуги низ година имају значајну улогу у свим областима дело‑ вања савременог човека, посебно баријум‑стронцијум‑титанатом. Наводи се да су материјали на бази BST широко прихваћена тема истраживања због своје високе пермитивности, малог диелектричног губитка, високог коефицијента подешавања, велике брзине реакције, способности против квара, једноставног процеса производње итд. Као додатна предност, они не садржe олово и стога су у складу са тренутним захтевима за еколошки нешкодљиве материјале, што их чини веома атрактивним за потенцијалне примене. Имајући наведено у виду, а узимајући у обзир значај ових мате‑ ријала као фероелектрика, ова монографија се бави проучавањем нових материјала на бази баријум‑стронцијум‑титаната односно његове синтезе под контролисаним условима механичке активације и синтеровања ради даље функционалне примене у електронској индустрији. Аутор се у монографији бави утицајем механичке активације на процес формирања Ba1‑x SrxTiO3(BST) керамике синтеровањем у чврстој фази, која обезбеђује добру хомогеност прахова, доводи до снижења температуре калцинације и омогућава синтезу BST керамикe дефинисаног фазног састава. Баријум‑стронцијум‑титанат је припремљен од почетних материјала BaCO3, SrCO3 и TiO2 кроз реакције у чврстом стању. Мешавине ових оксида механички су активиране у високоенергетском планетарном млину у различитим временским интервалима од 0 до 120 минута у атмосфери ваздуха. Карактеризација прахова је урађена путем X‑ray анализе и пре‑ ко DTA и TG анализе на 1100°C, а расподела величине честица заједно са скенирајућом електронском микроскопијом дале су аутору веома корисне информације о морфологији праха. Микроструктурна анализа показује да продужавање трајања механичке активације резултира мањом просечном величином кристалита, повећањем вредности микродеформација и мини‑ малне густине дислокације. Након механичке активације почетних прахова, узорци су калциниса‑ ни и пресовани, а затим синтеровани у коморној лабораторијској пећи. Изотермско синтеровање пресованих узорака рађено је на температу‑ рама од 1100 до 1400°C у временским интервалима од 0 до 120 минута у атмосфери ваздуха. Ова анализа показује комплексан ендотермни пик у температурном региону 800–1000°C, који се помера ка нижим температу‑ рама и смањује интензитет са повећањем времена механичке активације. Ово указује да механичка активација не само да снижава почетну температуру процеса синтеровања, већ га такође олакшава и смањује укупну енталпију синтеровања, што указује на мању потрошњу енергије са по‑ већањем времена механичке активације. Наводи се да су ови ефекти били израженији у узорцима са већим садржајем стронцијума. Електрична мерења су спроведена за најгушће керамике синтероване на 1400°C два сата. Синтерованим узорцима мерена су микроталасна електрична својства, као што су фактор доброте Q, специфична електрична отпорност (ρ) и диелектрична константа (εr). Електрична својства синтерованих узорака показују доминантан утицај механичке активације у временима активације од 5 до 80 минута. Диелектрична пермитивност у механички активираним узорцима је нижа од оне у неактивираном узор‑ ку. Тренд промене диелектричне пермитивности указује да се ово може до‑ вести у корелацију са секундарном агломерацијом, јер узорци активирани 80 минута показују најнижу вредност диелектричне пермитивности. На основу резултата произашлих из овог експеримента створени су услови за контролу структуре баријум‑стронцијум‑титаната путем пара‑ метара синтезе, а тиме је омогућено добијање материјала са унапред зада‑ тим својствима који могу наћи широку примену у области електронике. Циљ ове монографије је да покаже утицај механичке активације и режи‑ ма синтеровања на промену структуре и електрична својства BST керамике. На основу детаљне анализе температурске зависности, реалне диелек‑ тричне пропустљивости и тангенса угла губитака, као и утицаја механичке активације на промену фреквентних карактеристика биће дефинисани оп‑ тимални технолошки параметри задобијање Ba0,77Sr0,23TiO3 керамике уна‑ пређених електричних карактеристика. Аутор се нада да ће ова монографија бити од помоћи истраживачима у овој важној, динамичној области савремених материјала у електротехници.
AB  - Modern technological development is not possible without novel materials, where these materials are objectively a consequence of achievements in the field of materials science. This monograph deals with ceramic materials that have, for many years, been playing a significant role in all areas of modern civilization, in particular barium strontium titanate. BST materials have been a widely welcomed topic due to its high permittivity, low dielectric loss, high tunability coefficient, high reaction velocity, anti‑breakdown ability, and simple fabrication process, etc. As an additional advantage, BST family is lead‑free, and therefore compliant with current requirements for environmentally benign materials, making it very attractive for potential applications. Having this in mind, and taking into account the importance of these materials as ferroelectrics, this monograph presents a study of new materials based on barium strontium titanate, and their synthesis under controlled conditions of mechanical activation and sintering for further functional application in the electronics industry. In the monograph, the author examined the influence of mechanical activation on the process of formation of Ba1‑x SrxTiO3 (BST) ceramics using the solid‑state sintering method. The use of the method of mechanical activation ensures a good homogeneity of powders, lowers the calcination temperature, and enables the synthesis of BST ceramics of pre‑defined phase composition. Barium strontium titanate was prepared from the starting materials BaCO3, SrCO3 and TiO2 through solid state reaction. Mixtures of these oxides are mechanically activated in a high‑energy planetary mill at various time intervals from 0 to 120 minutes in air. Powder characterization was done by X‑ray analysis, by DTA and TG analysis at 1100°C, and by particle size distribution combined with scanning electron microscopy. These provided very detailed information about the powder morphology. Microstructural analysis shows that the increase duration of mechanical activation results in lower average crystallite size, and increased values of microstrain and minimal dislocation density. After mechanical activation of the initial powders, samples were calcined and pressed and then sintered in a chamber laboratory furnace. Isothermal sintering of extruded samples was performed at temperatures from 1100 to 1400°C for 0 to 120 minutes in air. This shows a complex endothermic peak in 800–1000°C temperature region, which shifts to lower temperatures and decreases in intensity with the increase in mechanical activation time. This indicates that mechanical activation not only reduces the onset temperature of the sintering process, but also facilitates it and reduces the overall enthalpy of sintering, indicating a reduction of energy consumption with increase in mechanical activation time. Electrical measurements were performed for the densest ceramics sintered at 1400°C for two hours, measuring microwave electrical properties, such as goodness factor (Q), specific electrical resistance (ρ) and dielectric constant (εr). Electrical properties of sintered BST‑S samples show the dominant influence of mechanical activation at activation times from 5 to 80 minutes. Dielectric permittivity in mechanically activated samples is lower than that in non‑activated samples. The trend of change of dielectric permittivity suggests that this can be correlated with secondary agglomeration, because samples activated for 80 minutes exhibit the lowest value of dielectric permittivity. Based on the results obtained from this experiment, synthesis conditions were defined to control the structure of barium strontium titanate through synthesis parameters, enabling the production of materials with predetermined properties that can find wide application in the field of electronics. The author hopes that this monograph would be useful to researchers in this important, dynamic field of modern materials in electrotechnics.
PB  - Београд : Задужбина Андрејевић
T1  - Диелектрична керамика баријум‑стронцијум‑титаната
T1  - Dielectric Barium Strontium Titanate Ceramics
UR  - https://hdl.handle.net/21.15107/rcub_dais_12573
ER  - 

@book{
author = "Косановић, Дарко",
year = "2021",
abstract = "С обзиром на то да развој савремене технике није могућ без нових ма‑ теријала, што је објективно последица достигнућа у области науке о материјалима, аутор се у овој монографији бави керамичким материјали‑ ма који већ дуги низ година имају значајну улогу у свим областима дело‑ вања савременог човека, посебно баријум‑стронцијум‑титанатом. Наводи се да су материјали на бази BST широко прихваћена тема истраживања због своје високе пермитивности, малог диелектричног губитка, високог коефицијента подешавања, велике брзине реакције, способности против квара, једноставног процеса производње итд. Као додатна предност, они не садржe олово и стога су у складу са тренутним захтевима за еколошки нешкодљиве материјале, што их чини веома атрактивним за потенцијалне примене. Имајући наведено у виду, а узимајући у обзир значај ових мате‑ ријала као фероелектрика, ова монографија се бави проучавањем нових материјала на бази баријум‑стронцијум‑титаната односно његове синтезе под контролисаним условима механичке активације и синтеровања ради даље функционалне примене у електронској индустрији. Аутор се у монографији бави утицајем механичке активације на процес формирања Ba1‑x SrxTiO3(BST) керамике синтеровањем у чврстој фази, која обезбеђује добру хомогеност прахова, доводи до снижења температуре калцинације и омогућава синтезу BST керамикe дефинисаног фазног састава. Баријум‑стронцијум‑титанат је припремљен од почетних материјала BaCO3, SrCO3 и TiO2 кроз реакције у чврстом стању. Мешавине ових оксида механички су активиране у високоенергетском планетарном млину у различитим временским интервалима од 0 до 120 минута у атмосфери ваздуха. Карактеризација прахова је урађена путем X‑ray анализе и пре‑ ко DTA и TG анализе на 1100°C, а расподела величине честица заједно са скенирајућом електронском микроскопијом дале су аутору веома корисне информације о морфологији праха. Микроструктурна анализа показује да продужавање трајања механичке активације резултира мањом просечном величином кристалита, повећањем вредности микродеформација и мини‑ малне густине дислокације. Након механичке активације почетних прахова, узорци су калциниса‑ ни и пресовани, а затим синтеровани у коморној лабораторијској пећи. Изотермско синтеровање пресованих узорака рађено је на температу‑ рама од 1100 до 1400°C у временским интервалима од 0 до 120 минута у атмосфери ваздуха. Ова анализа показује комплексан ендотермни пик у температурном региону 800–1000°C, који се помера ка нижим температу‑ рама и смањује интензитет са повећањем времена механичке активације. Ово указује да механичка активација не само да снижава почетну температуру процеса синтеровања, већ га такође олакшава и смањује укупну енталпију синтеровања, што указује на мању потрошњу енергије са по‑ већањем времена механичке активације. Наводи се да су ови ефекти били израженији у узорцима са већим садржајем стронцијума. Електрична мерења су спроведена за најгушће керамике синтероване на 1400°C два сата. Синтерованим узорцима мерена су микроталасна електрична својства, као што су фактор доброте Q, специфична електрична отпорност (ρ) и диелектрична константа (εr). Електрична својства синтерованих узорака показују доминантан утицај механичке активације у временима активације од 5 до 80 минута. Диелектрична пермитивност у механички активираним узорцима је нижа од оне у неактивираном узор‑ ку. Тренд промене диелектричне пермитивности указује да се ово може до‑ вести у корелацију са секундарном агломерацијом, јер узорци активирани 80 минута показују најнижу вредност диелектричне пермитивности. На основу резултата произашлих из овог експеримента створени су услови за контролу структуре баријум‑стронцијум‑титаната путем пара‑ метара синтезе, а тиме је омогућено добијање материјала са унапред зада‑ тим својствима који могу наћи широку примену у области електронике. Циљ ове монографије је да покаже утицај механичке активације и режи‑ ма синтеровања на промену структуре и електрична својства BST керамике. На основу детаљне анализе температурске зависности, реалне диелек‑ тричне пропустљивости и тангенса угла губитака, као и утицаја механичке активације на промену фреквентних карактеристика биће дефинисани оп‑ тимални технолошки параметри задобијање Ba0,77Sr0,23TiO3 керамике уна‑ пређених електричних карактеристика. Аутор се нада да ће ова монографија бити од помоћи истраживачима у овој важној, динамичној области савремених материјала у електротехници., Modern technological development is not possible without novel materials, where these materials are objectively a consequence of achievements in the field of materials science. This monograph deals with ceramic materials that have, for many years, been playing a significant role in all areas of modern civilization, in particular barium strontium titanate. BST materials have been a widely welcomed topic due to its high permittivity, low dielectric loss, high tunability coefficient, high reaction velocity, anti‑breakdown ability, and simple fabrication process, etc. As an additional advantage, BST family is lead‑free, and therefore compliant with current requirements for environmentally benign materials, making it very attractive for potential applications. Having this in mind, and taking into account the importance of these materials as ferroelectrics, this monograph presents a study of new materials based on barium strontium titanate, and their synthesis under controlled conditions of mechanical activation and sintering for further functional application in the electronics industry. In the monograph, the author examined the influence of mechanical activation on the process of formation of Ba1‑x SrxTiO3 (BST) ceramics using the solid‑state sintering method. The use of the method of mechanical activation ensures a good homogeneity of powders, lowers the calcination temperature, and enables the synthesis of BST ceramics of pre‑defined phase composition. Barium strontium titanate was prepared from the starting materials BaCO3, SrCO3 and TiO2 through solid state reaction. Mixtures of these oxides are mechanically activated in a high‑energy planetary mill at various time intervals from 0 to 120 minutes in air. Powder characterization was done by X‑ray analysis, by DTA and TG analysis at 1100°C, and by particle size distribution combined with scanning electron microscopy. These provided very detailed information about the powder morphology. Microstructural analysis shows that the increase duration of mechanical activation results in lower average crystallite size, and increased values of microstrain and minimal dislocation density. After mechanical activation of the initial powders, samples were calcined and pressed and then sintered in a chamber laboratory furnace. Isothermal sintering of extruded samples was performed at temperatures from 1100 to 1400°C for 0 to 120 minutes in air. This shows a complex endothermic peak in 800–1000°C temperature region, which shifts to lower temperatures and decreases in intensity with the increase in mechanical activation time. This indicates that mechanical activation not only reduces the onset temperature of the sintering process, but also facilitates it and reduces the overall enthalpy of sintering, indicating a reduction of energy consumption with increase in mechanical activation time. Electrical measurements were performed for the densest ceramics sintered at 1400°C for two hours, measuring microwave electrical properties, such as goodness factor (Q), specific electrical resistance (ρ) and dielectric constant (εr). Electrical properties of sintered BST‑S samples show the dominant influence of mechanical activation at activation times from 5 to 80 minutes. Dielectric permittivity in mechanically activated samples is lower than that in non‑activated samples. The trend of change of dielectric permittivity suggests that this can be correlated with secondary agglomeration, because samples activated for 80 minutes exhibit the lowest value of dielectric permittivity. Based on the results obtained from this experiment, synthesis conditions were defined to control the structure of barium strontium titanate through synthesis parameters, enabling the production of materials with predetermined properties that can find wide application in the field of electronics. The author hopes that this monograph would be useful to researchers in this important, dynamic field of modern materials in electrotechnics.",
publisher = "Београд : Задужбина Андрејевић",
title = "Диелектрична керамика баријум‑стронцијум‑титаната, Dielectric Barium Strontium Titanate Ceramics",
url = "https://hdl.handle.net/21.15107/rcub_dais_12573"
}

Косановић, Д.. (2021). Диелектрична керамика баријум‑стронцијум‑титаната. 
Београд : Задужбина Андрејевић..
https://hdl.handle.net/21.15107/rcub_dais_12573

Косановић Д. Диелектрична керамика баријум‑стронцијум‑титаната. 2021;.
https://hdl.handle.net/21.15107/rcub_dais_12573 .

Косановић, Дарко, "Диелектрична керамика баријум‑стронцијум‑титаната" (2021),
https://hdl.handle.net/21.15107/rcub_dais_12573 .

TY  - CONF
AU  - Kosanović, Darko
AU  - Pucky, Viktor
AU  - Aleksić, Stanko O.
AU  - Pavlović, Vladimir B.
AU  - Blagojević, Vladimir A.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11913
AB  - Barium zirconium titanate ceramics were prepared using solid state reactions of BaCO3, TiO2 and ZrO2 at elevated temperatures. The prepared BZT was mechanically activated in the planetary ball mill from 0-120 min to achieve different powder grades from micro- to nanosized particles. After the powder characterization by XRD and SEM the samples were pressed in disc shape and sintered at 1100 and 1200 °C in the air. The sintered samples were characterized by SEM. After that the silver epoxy electrodes were deposited on sintered disc samples. The disc samples capacitance and resistivity were measured in the low frequency region from 1 Hz to 200 kHz using a low frequency impedance analyzer. Sintering temperatures and powder grades were used as parameters. Finally, specific resistance ρ, dielectric permittivity (ε' + jε") and tgδ were obtained from the impedance measurements. The trends in electronic properties were analyzed: the relaxation effect of the space charge (inter-granular electric charges) vs. sintering temperature and ceramic grades. These show that mechanical activation has a significant effect on electrical properties, resulting in generally improved overall performance.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
T1  - Electronic Properties of BZT Nano-Ceramic Grades at Low Frequency Region
SP  - 34
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_dais_11913
ER  - 

@conference{
author = "Kosanović, Darko and Pucky, Viktor and Aleksić, Stanko O. and Pavlović, Vladimir B. and Blagojević, Vladimir A.",
year = "2021",
abstract = "Barium zirconium titanate ceramics were prepared using solid state reactions of BaCO3, TiO2 and ZrO2 at elevated temperatures. The prepared BZT was mechanically activated in the planetary ball mill from 0-120 min to achieve different powder grades from micro- to nanosized particles. After the powder characterization by XRD and SEM the samples were pressed in disc shape and sintered at 1100 and 1200 °C in the air. The sintered samples were characterized by SEM. After that the silver epoxy electrodes were deposited on sintered disc samples. The disc samples capacitance and resistivity were measured in the low frequency region from 1 Hz to 200 kHz using a low frequency impedance analyzer. Sintering temperatures and powder grades were used as parameters. Finally, specific resistance ρ, dielectric permittivity (ε' + jε") and tgδ were obtained from the impedance measurements. The trends in electronic properties were analyzed: the relaxation effect of the space charge (inter-granular electric charges) vs. sintering temperature and ceramic grades. These show that mechanical activation has a significant effect on electrical properties, resulting in generally improved overall performance.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021",
title = "Electronic Properties of BZT Nano-Ceramic Grades at Low Frequency Region",
pages = "34-34",
url = "https://hdl.handle.net/21.15107/rcub_dais_11913"
}

Kosanović, D., Pucky, V., Aleksić, S. O., Pavlović, V. B.,& Blagojević, V. A.. (2021). Electronic Properties of BZT Nano-Ceramic Grades at Low Frequency Region. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
Belgrade : Serbian Ceramic Society., 34-34.
https://hdl.handle.net/21.15107/rcub_dais_11913

Kosanović D, Pucky V, Aleksić SO, Pavlović VB, Blagojević VA. Electronic Properties of BZT Nano-Ceramic Grades at Low Frequency Region. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021. 2021;:34-34.
https://hdl.handle.net/21.15107/rcub_dais_11913 .

Kosanović, Darko, Pucky, Viktor, Aleksić, Stanko O., Pavlović, Vladimir B., Blagojević, Vladimir A., "Electronic Properties of BZT Nano-Ceramic Grades at Low Frequency Region" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021 (2021):34-34,
https://hdl.handle.net/21.15107/rcub_dais_11913 .

TY  - CONF
AU  - Pavlović, Vera P.
AU  - Tshantshapanyan, Ani
AU  - Vlahović, Branislav
AU  - Živojinović, Jelena
AU  - Kosanović, Darko
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/14758
AB  - The changes in the Raman spectra of electronic materials obtained from mechanically activated BaTiO3 and SrTiO3 powders, with or without additives, are presented in this paper. Mechanical activation, performed in a high-energy planetary ball mill, was chosen as the method for the production of fine-grained nanocrystalline powders with an increased surface activity and an altered micro and/or crystal structure. Having in mind the growing relevance of the development of multiferroic materials, the analysis of Raman spectra was used not only for the structural investigations of the mechanically activated undoped titanate powder, but also for the examination of the mechanically activated Fe/BaTiO3 system and the subsequent hexaferrite formation during the sintering process. Additionally, Raman spectroscopy was applied in the study of the emergence of electroactive crystalline phases in nanocomposites based on semi-crystalline fluoropolymers, such as PVDF (polyvinylidene fluoride), in the case when mechanically activated BaTiO3 powder was used as a filler in the polymer matrix. Furthermore, the effects of the mechanical activation of SrTiO3 powder on the occurrence of polar nano and micro-regions at room temperature, as well as the simultaneous influence of activation and MnO2 addition on structural changes in ceramic SrTiO3 samples, have also been analysed using Raman spectroscopy.
PB  - Belgrade : ETRAN Society
PB  - Belgrade : Academic Mind
C3  - Зборник радова [Електронски извор] / 64. годишњa конференција за електронику, телекомуникације, рачунарство, аутоматику и нуклеарну технику EТРАН 2020 и 7. интернационалнa конференцијa за електротехнику, електронику и рачунарство ИцЕТРАН 2020 = 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020 and 64th National Conference on Electrоnics, Telecommunication, Computing, Automatic Control and Nuclear Engineering ETRAN 2020
T1  - Raman spectra of the materials based on mechanically activated alkaline earth metal titanates
SP  - NMI 1.1.1
EP  - NMI 1.1.8
UR  - https://hdl.handle.net/21.15107/rcub_dais_14758
ER  - 

@conference{
author = "Pavlović, Vera P. and Tshantshapanyan, Ani and Vlahović, Branislav and Živojinović, Jelena and Kosanović, Darko and Pavlović, Vladimir B.",
year = "2020",
abstract = "The changes in the Raman spectra of electronic materials obtained from mechanically activated BaTiO3 and SrTiO3 powders, with or without additives, are presented in this paper. Mechanical activation, performed in a high-energy planetary ball mill, was chosen as the method for the production of fine-grained nanocrystalline powders with an increased surface activity and an altered micro and/or crystal structure. Having in mind the growing relevance of the development of multiferroic materials, the analysis of Raman spectra was used not only for the structural investigations of the mechanically activated undoped titanate powder, but also for the examination of the mechanically activated Fe/BaTiO3 system and the subsequent hexaferrite formation during the sintering process. Additionally, Raman spectroscopy was applied in the study of the emergence of electroactive crystalline phases in nanocomposites based on semi-crystalline fluoropolymers, such as PVDF (polyvinylidene fluoride), in the case when mechanically activated BaTiO3 powder was used as a filler in the polymer matrix. Furthermore, the effects of the mechanical activation of SrTiO3 powder on the occurrence of polar nano and micro-regions at room temperature, as well as the simultaneous influence of activation and MnO2 addition on structural changes in ceramic SrTiO3 samples, have also been analysed using Raman spectroscopy.",
publisher = "Belgrade : ETRAN Society, Belgrade : Academic Mind",
journal = "Зборник радова [Електронски извор] / 64. годишњa конференција за електронику, телекомуникације, рачунарство, аутоматику и нуклеарну технику EТРАН 2020 и 7. интернационалнa конференцијa за електротехнику, електронику и рачунарство ИцЕТРАН 2020 = 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020 and 64th National Conference on Electrоnics, Telecommunication, Computing, Automatic Control and Nuclear Engineering ETRAN 2020",
title = "Raman spectra of the materials based on mechanically activated alkaline earth metal titanates",
pages = "NMI 1.1.1-NMI 1.1.8",
url = "https://hdl.handle.net/21.15107/rcub_dais_14758"
}

Pavlović, V. P., Tshantshapanyan, A., Vlahović, B., Živojinović, J., Kosanović, D.,& Pavlović, V. B.. (2020). Raman spectra of the materials based on mechanically activated alkaline earth metal titanates. in Зборник радова [Електронски извор] / 64. годишњa конференција за електронику, телекомуникације, рачунарство, аутоматику и нуклеарну технику EТРАН 2020 и 7. интернационалнa конференцијa за електротехнику, електронику и рачунарство ИцЕТРАН 2020 = 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020 and 64th National Conference on Electrоnics, Telecommunication, Computing, Automatic Control and Nuclear Engineering ETRAN 2020
Belgrade : ETRAN Society., NMI 1.1.1-NMI 1.1.8.
https://hdl.handle.net/21.15107/rcub_dais_14758

Pavlović VP, Tshantshapanyan A, Vlahović B, Živojinović J, Kosanović D, Pavlović VB. Raman spectra of the materials based on mechanically activated alkaline earth metal titanates. in Зборник радова [Електронски извор] / 64. годишњa конференција за електронику, телекомуникације, рачунарство, аутоматику и нуклеарну технику EТРАН 2020 и 7. интернационалнa конференцијa за електротехнику, електронику и рачунарство ИцЕТРАН 2020 = 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020 and 64th National Conference on Electrоnics, Telecommunication, Computing, Automatic Control and Nuclear Engineering ETRAN 2020. 2020;:NMI 1.1.1-NMI 1.1.8.
https://hdl.handle.net/21.15107/rcub_dais_14758 .

Pavlović, Vera P., Tshantshapanyan, Ani, Vlahović, Branislav, Živojinović, Jelena, Kosanović, Darko, Pavlović, Vladimir B., "Raman spectra of the materials based on mechanically activated alkaline earth metal titanates" in Зборник радова [Електронски извор] / 64. годишњa конференција за електронику, телекомуникације, рачунарство, аутоматику и нуклеарну технику EТРАН 2020 и 7. интернационалнa конференцијa за електротехнику, електронику и рачунарство ИцЕТРАН 2020 = 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020 and 64th National Conference on Electrоnics, Telecommunication, Computing, Automatic Control and Nuclear Engineering ETRAN 2020 (2020):NMI 1.1.1-NMI 1.1.8,
https://hdl.handle.net/21.15107/rcub_dais_14758 .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Labus, Nebojša
AU  - Živojinović, Jelena
AU  - Peleš Tadić, Adriana
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10039
AB  - The influence of mechanical activation on the formation, sintering kinetics and morphology was investigated in sintered barium strontium titanate (BST) ceramics with different Ba-to-Sr ratios. Initial powders were mechanically activated for 20 and 120 min, leading to mechano-chemical reaction and formation of BaxSr1-xTiO3 phases. Agglomeration was found to represent an important factor in the process of formation of BaxSr1-xTiO3 phases around 800 oC and during sintering. It reduces the effectiveness of mechanical activation on formation of BaxSr1-xTiO3 phases beyond the short period (20 min), while in the process of sintering, prolonged mechanical activation (120 min) leads to a significant reduction in sintering temperature and the corresponding value of activation energy. In addition, all three systems show a phase transformation around 1100 oC, attributed to the hexagonal-to-cubic phase transition. Morphology of the final sintered ceramics can be correlated primarily with the state of the pre-sintered powder, where mechanically activated powders with smaller particle size produced more compact and less porous final product.
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Effects of Mechanical Activation on the Formation and Sintering Kinetics of Barium Strontium Titanate Ceramics
SP  - 371
EP  - 385
VL  - 52
IS  - 4
DO  - 10.2298/SOS2004371K
UR  - https://hdl.handle.net/21.15107/rcub_dais_10039
ER  - 

@article{
author = "Kosanović, Darko and Labus, Nebojša and Živojinović, Jelena and Peleš Tadić, Adriana and Blagojević, Vladimir A. and Pavlović, Vladimir B.",
year = "2020",
abstract = "The influence of mechanical activation on the formation, sintering kinetics and morphology was investigated in sintered barium strontium titanate (BST) ceramics with different Ba-to-Sr ratios. Initial powders were mechanically activated for 20 and 120 min, leading to mechano-chemical reaction and formation of BaxSr1-xTiO3 phases. Agglomeration was found to represent an important factor in the process of formation of BaxSr1-xTiO3 phases around 800 oC and during sintering. It reduces the effectiveness of mechanical activation on formation of BaxSr1-xTiO3 phases beyond the short period (20 min), while in the process of sintering, prolonged mechanical activation (120 min) leads to a significant reduction in sintering temperature and the corresponding value of activation energy. In addition, all three systems show a phase transformation around 1100 oC, attributed to the hexagonal-to-cubic phase transition. Morphology of the final sintered ceramics can be correlated primarily with the state of the pre-sintered powder, where mechanically activated powders with smaller particle size produced more compact and less porous final product.",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Effects of Mechanical Activation on the Formation and Sintering Kinetics of Barium Strontium Titanate Ceramics",
pages = "371-385",
volume = "52",
number = "4",
doi = "10.2298/SOS2004371K",
url = "https://hdl.handle.net/21.15107/rcub_dais_10039"
}

Kosanović, D., Labus, N., Živojinović, J., Peleš Tadić, A., Blagojević, V. A.,& Pavlović, V. B.. (2020). Effects of Mechanical Activation on the Formation and Sintering Kinetics of Barium Strontium Titanate Ceramics. in Science of Sintering
Belgrade : ETRAN., 52(4), 371-385.
https://doi.org/10.2298/SOS2004371K
https://hdl.handle.net/21.15107/rcub_dais_10039

Kosanović D, Labus N, Živojinović J, Peleš Tadić A, Blagojević VA, Pavlović VB. Effects of Mechanical Activation on the Formation and Sintering Kinetics of Barium Strontium Titanate Ceramics. in Science of Sintering. 2020;52(4):371-385.
doi:10.2298/SOS2004371K
https://hdl.handle.net/21.15107/rcub_dais_10039 .

Kosanović, Darko, Labus, Nebojša, Živojinović, Jelena, Peleš Tadić, Adriana, Blagojević, Vladimir A., Pavlović, Vladimir B., "Effects of Mechanical Activation on the Formation and Sintering Kinetics of Barium Strontium Titanate Ceramics" in Science of Sintering, 52, no. 4 (2020):371-385,
https://doi.org/10.2298/SOS2004371K .,
https://hdl.handle.net/21.15107/rcub_dais_10039 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Rusmirović, Jelena
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Marinković, Aleksandar
AU  - Radić, Danka
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10040
AB  - Industrial/technological growth is directly connected with environmental pollution, but its influence can be minimized through pollution abatement approaches such as the treatment of industrial wastewater. In this study, novel porous amine-functionalized silicate minerals, specifically, cordierite was investigated for the removal of toxic heavy metals from industrial wastewaters. Cordierite supports were synthesized by mixing MgO, Al2O3 , and SiO2 powders in 2:2:5 molar ratios, and mechanically activated via ball milling in ethanol for 10, 40, or 80 min. Pellets were sintered by heating in air at 20°C min-1 to 1,350°C, for 2 h. Porous supports were produced by coarsely crushing the sintered pellets and mixing the crushed and sieved cordierite powder with 20 wt.% of a pore-forming agent, either nanocellulose or yeast. The resulting pellets were sintered by heating at 5°C min-1 to 700°C in air. The synthetic cordierite support was modified by treatment in poly-ethylenimine. Activated supports were then tested for the removal of Ni2+ and Cd2+ ions. The phase composition of the cordierite supports was analyzed by the X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. Analysis of adsorption isotherms, kinetics, and thermodynamic parameters indicated that adsorption was a spontaneous, endothermic process with a maximum adsorption capacity of 36 mg g-1 for Cd2+ and 43 mg g-1 for Ni2+. This work has shed light on the mechanism of heavy metal removal from the aquatic medium using the novel hybrid functionalized cordierite-based ceramic.
PB  - Desalination Publications
T2  - Desalination and Water Treatment
T1  - Porous cordierite-supported polyethyleneimine composites for nickel(II) and cadmium(II) ions removal
SP  - 283
EP  - 296
VL  - 192
DO  - 10.5004/dwt.2020.25736
UR  - https://hdl.handle.net/21.15107/rcub_dais_10040
ER  - 

@article{
author = "Obradović, Nina and Rusmirović, Jelena and Filipović, Suzana and Kosanović, Darko and Marinković, Aleksandar and Radić, Danka and Pavlović, Vladimir B.",
year = "2020",
abstract = "Industrial/technological growth is directly connected with environmental pollution, but its influence can be minimized through pollution abatement approaches such as the treatment of industrial wastewater. In this study, novel porous amine-functionalized silicate minerals, specifically, cordierite was investigated for the removal of toxic heavy metals from industrial wastewaters. Cordierite supports were synthesized by mixing MgO, Al2O3 , and SiO2 powders in 2:2:5 molar ratios, and mechanically activated via ball milling in ethanol for 10, 40, or 80 min. Pellets were sintered by heating in air at 20°C min-1 to 1,350°C, for 2 h. Porous supports were produced by coarsely crushing the sintered pellets and mixing the crushed and sieved cordierite powder with 20 wt.% of a pore-forming agent, either nanocellulose or yeast. The resulting pellets were sintered by heating at 5°C min-1 to 700°C in air. The synthetic cordierite support was modified by treatment in poly-ethylenimine. Activated supports were then tested for the removal of Ni2+ and Cd2+ ions. The phase composition of the cordierite supports was analyzed by the X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. Analysis of adsorption isotherms, kinetics, and thermodynamic parameters indicated that adsorption was a spontaneous, endothermic process with a maximum adsorption capacity of 36 mg g-1 for Cd2+ and 43 mg g-1 for Ni2+. This work has shed light on the mechanism of heavy metal removal from the aquatic medium using the novel hybrid functionalized cordierite-based ceramic.",
publisher = "Desalination Publications",
journal = "Desalination and Water Treatment",
title = "Porous cordierite-supported polyethyleneimine composites for nickel(II) and cadmium(II) ions removal",
pages = "283-296",
volume = "192",
doi = "10.5004/dwt.2020.25736",
url = "https://hdl.handle.net/21.15107/rcub_dais_10040"
}

Obradović, N., Rusmirović, J., Filipović, S., Kosanović, D., Marinković, A., Radić, D.,& Pavlović, V. B.. (2020). Porous cordierite-supported polyethyleneimine composites for nickel(II) and cadmium(II) ions removal. in Desalination and Water Treatment
Desalination Publications., 192, 283-296.
https://doi.org/10.5004/dwt.2020.25736
https://hdl.handle.net/21.15107/rcub_dais_10040

Obradović N, Rusmirović J, Filipović S, Kosanović D, Marinković A, Radić D, Pavlović VB. Porous cordierite-supported polyethyleneimine composites for nickel(II) and cadmium(II) ions removal. in Desalination and Water Treatment. 2020;192:283-296.
doi:10.5004/dwt.2020.25736
https://hdl.handle.net/21.15107/rcub_dais_10040 .

Obradović, Nina, Rusmirović, Jelena, Filipović, Suzana, Kosanović, Darko, Marinković, Aleksandar, Radić, Danka, Pavlović, Vladimir B., "Porous cordierite-supported polyethyleneimine composites for nickel(II) and cadmium(II) ions removal" in Desalination and Water Treatment, 192 (2020):283-296,
https://doi.org/10.5004/dwt.2020.25736 .,
https://hdl.handle.net/21.15107/rcub_dais_10040 .