Obradović, Nina

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Authority KeyName Variants
orcid::0000-0002-7993-293X
  • Obradović, Nina (193)
  • Obradović, Nina N. (1)
Projects
Directed synthesis, structure and properties of multifunctional materials Investigation of the relation in triad: Synthesis structure-properties for functional materials
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200175 (Institute of Technical Sciences of SASA, Belgrade) Ministry of Education, Youth and Sports (MEYS) of Czech Republic - CEITEC 2020 [LQ1601]
Development and application of multifunctional materials using domestic raw materials in upgraded processing lines United States National Aeronautics and Space Administration (NASA), Grant NNX09AV07A
Serbian Academy of Sciences and Arts, Project F-198 Synthesis, processing and applications of nanostructured multifunctional materials with defined properties
Algorithms and software for frequency-domain and time-domain simulations of RF subsystems and electromagnetic sensors in ICT Serbian Academy of Sciences and Arts, Project F-133
United States National Science Foundation (NSF) / Centers of Research Excellence in Science and Technology (CREST), Grant HRD-0833184 United States National Science Foundation (NSF) / Partnerships for Research and Education in Materials (PREM), Grant 1523617
Bilateral cooperation between Serbia and France, No. 4510339/2016/09/03 “Inteligent econanomaterials and nanocomposites” Grant Agency of the Czech Republic, Project 15-06390S
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM) Zero- to Three-Dimensional Nanostructures for Application in Electronics and Renewable Energy Sources: Synthesis, Characterization and Processing
National Science Foundation, North Carolina State University, Project No. HRD-1345219 Czech Science Foundation (GACR) - 17-05620S
Investigation of intermetallics and semiconductors and possible application in renewable energy sources Geologic and ecotoxicologic research in identification of geopathogen zones of toxic elements in drinking water reservoirs- research into methods and procedures for reduction of biochemical anomalies
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča) Brno University of Technology - BUT Internal Projects: STI-J-18-5456, Czechia
CEITEC Nano RI, MEYS CR, 2016–2019 CONACYT grant 2018-000022-01EXTV-00188, Mexico
DAAD scholarship project "Development of materials and manufacturing technologies for electric discharge machinable Zirconia–CNT/Graphene composites" Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200023 (Institute of Technology of Nuclear and Other Mineral Row Materials - ITNMS, Belgrade)
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200131 (University of Belgrade, Technical Faculty, Bor) Innovative electronic components and systems based on inorganic and organic technologies embedded in consumer goods and products
NATO project SPS G5767 - "Super Strong Ceramics for Protection in Harsh Environments and DefenCE" (SUSPENCE) Serbian Academy of Sciences and Arts, Project F-7

Author's Bibliography

Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution

Silvestroni, Laura; Gilli, Nicola; Obradović, Nina; Filipović, Suzana; Watts, Jeremy L.; Fahrenholtz, William G.

(Belgrade : Serbian Ceramic Society, 2022)

TY  - CONF
AU  - Silvestroni, Laura
AU  - Gilli, Nicola
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Watts, Jeremy L.
AU  - Fahrenholtz, William G.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13617
AB  - ZrB2 is widely recognized as the most prominent ultra-high temperature ceramic for aerospace applications, in view of its melting point above 3000°C, and despite it exhibits lower oxidation and ablation resistance as compared to HfB2, it has a much lower density. The addition of TiB2 further lowers the overall weight, which is a relevant factor for materials intended to flight, but it also worsen the oxidation resistance. In this work, different Mecompounds, where Me = Nb, Hf, Cr, V, are added to the ZrB2-TiB2 system to study their effect on the densification, microstructure and thermo-mechanical properties. By adjusting the processing and sintering cycles, fully dense multi-phase ceramics with density in the 5.3-5.7 g/cm3 range and hardness close to 24 GPa have been obtained. A common feature to all materials, is the formation of solid solutions and microstructural details obtained by x-ray diffraction, scanning and electron microscopy are highlighted. Particularly, we explored the nanotexturing of the shell within micron-sized boride grains of the matrix, which resulted from the preferential precipitation of Me-compounds with poor solubility within ZrB2 or TiB2 lattice. Preliminary bending strength and oxidation behavior of these intricate bulk multiphase ceramics are also provided.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution
SP  - 37
EP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_dais_13617
ER  - 
@conference{
author = "Silvestroni, Laura and Gilli, Nicola and Obradović, Nina and Filipović, Suzana and Watts, Jeremy L. and Fahrenholtz, William G.",
year = "2022",
abstract = "ZrB2 is widely recognized as the most prominent ultra-high temperature ceramic for aerospace applications, in view of its melting point above 3000°C, and despite it exhibits lower oxidation and ablation resistance as compared to HfB2, it has a much lower density. The addition of TiB2 further lowers the overall weight, which is a relevant factor for materials intended to flight, but it also worsen the oxidation resistance. In this work, different Mecompounds, where Me = Nb, Hf, Cr, V, are added to the ZrB2-TiB2 system to study their effect on the densification, microstructure and thermo-mechanical properties. By adjusting the processing and sintering cycles, fully dense multi-phase ceramics with density in the 5.3-5.7 g/cm3 range and hardness close to 24 GPa have been obtained. A common feature to all materials, is the formation of solid solutions and microstructural details obtained by x-ray diffraction, scanning and electron microscopy are highlighted. Particularly, we explored the nanotexturing of the shell within micron-sized boride grains of the matrix, which resulted from the preferential precipitation of Me-compounds with poor solubility within ZrB2 or TiB2 lattice. Preliminary bending strength and oxidation behavior of these intricate bulk multiphase ceramics are also provided.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution",
pages = "37-37",
url = "https://hdl.handle.net/21.15107/rcub_dais_13617"
}
Silvestroni, L., Gilli, N., Obradović, N., Filipović, S., Watts, J. L.,& Fahrenholtz, W. G.. (2022). Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 37-37.
https://hdl.handle.net/21.15107/rcub_dais_13617
Silvestroni L, Gilli N, Obradović N, Filipović S, Watts JL, Fahrenholtz WG. Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:37-37.
https://hdl.handle.net/21.15107/rcub_dais_13617 .
Silvestroni, Laura, Gilli, Nicola, Obradović, Nina, Filipović, Suzana, Watts, Jeremy L., Fahrenholtz, William G., "Multi-phase (Zr,Ti,Me)B2 solid solutions: preparation and microstructure evolution" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):37-37,
https://hdl.handle.net/21.15107/rcub_dais_13617 .

Structural properties of FeCoV alloys produced by PIM / MIM technology

Nedeljković, Borivoje; Pavlović, Vladimir B.; Obradović, Nina; Mitrović, Nebojša S.

(Belgrade : Serbian Ceramic Society, 2022)

TY  - CONF
AU  - Nedeljković, Borivoje
AU  - Pavlović, Vladimir B.
AU  - Obradović, Nina
AU  - Mitrović, Nebojša S.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13620
AB  - FeCoV alloys with high saturation magnetization and high Curie temperature, making them useful for high-temperature and power-dense applications (e. g. aviation device). In this study, we report the results of observing the structural properties of 49Fe49Co2V alloy produced by PIM / MIM technology. The starting granulate was prepared by mixing FeCoV powder with a low-viscosity binder. After injection, the raw “green” samples were first treated with a solvent and then thermally with the same aim of removing the binder. MIM technology is completed by high-temperature sintering of “brown” samples for 3.5 hours at temperatures from 1370 OC to 1460 OC in a hydrogen atmosphere, which provides the necessary magnetic and mechanical characteristics. Depending on the sintering temperature, structural parameters of particle size Dmax, Feret X, Feret Y were investigated and analysed.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Structural properties of FeCoV alloys produced by PIM / MIM technology
SP  - 57
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_dais_13620
ER  - 
@conference{
author = "Nedeljković, Borivoje and Pavlović, Vladimir B. and Obradović, Nina and Mitrović, Nebojša S.",
year = "2022",
abstract = "FeCoV alloys with high saturation magnetization and high Curie temperature, making them useful for high-temperature and power-dense applications (e. g. aviation device). In this study, we report the results of observing the structural properties of 49Fe49Co2V alloy produced by PIM / MIM technology. The starting granulate was prepared by mixing FeCoV powder with a low-viscosity binder. After injection, the raw “green” samples were first treated with a solvent and then thermally with the same aim of removing the binder. MIM technology is completed by high-temperature sintering of “brown” samples for 3.5 hours at temperatures from 1370 OC to 1460 OC in a hydrogen atmosphere, which provides the necessary magnetic and mechanical characteristics. Depending on the sintering temperature, structural parameters of particle size Dmax, Feret X, Feret Y were investigated and analysed.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Structural properties of FeCoV alloys produced by PIM / MIM technology",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_dais_13620"
}
Nedeljković, B., Pavlović, V. B., Obradović, N.,& Mitrović, N. S.. (2022). Structural properties of FeCoV alloys produced by PIM / MIM technology. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 57-57.
https://hdl.handle.net/21.15107/rcub_dais_13620
Nedeljković B, Pavlović VB, Obradović N, Mitrović NS. Structural properties of FeCoV alloys produced by PIM / MIM technology. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:57-57.
https://hdl.handle.net/21.15107/rcub_dais_13620 .
Nedeljković, Borivoje, Pavlović, Vladimir B., Obradović, Nina, Mitrović, Nebojša S., "Structural properties of FeCoV alloys produced by PIM / MIM technology" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):57-57,
https://hdl.handle.net/21.15107/rcub_dais_13620 .

Effect of high energy ball milling on sintering of MgO-TiO2 system

Filipović, Suzana; Obradović, Nina; Fahrenholtz, William G.; Smith, Steven; Mirković, M.; Peleš Tadić, Adriana; Tadić, Nenad; Đorđević, Antonije

(Belgrade : Serbian Ceramic Society, 2022)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Smith, Steven
AU  - Mirković, M.
AU  - Peleš Tadić, Adriana
AU  - Tadić, Nenad
AU  - Đorđević, Antonije
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13622
AB  - Perovskite ceramic material based on MgTiO3 is used in various types of electronic devices owing to its dielectric properties, high dielectric constant, and low losses. These features can be tailored by setting preparation conditions. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work. First, the mechanical activation in the highenergy ball mill was applied on the powder of MgO-TiO2 mixed in mole ratio 1:1. Prepared powder mixtures, activated for different times, were SPS sintered, at 1200 oC with a heating rate of 100oC/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied, and dwelled at this condition for 5 min, followed by cooling to room temperature at 5oC/min. The starting powders, activated mixtures, and sintered ceramics bodies were investigated by X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The presence of the MgTi2O5 phase was noticed for the nonmilled ceramics. In the samples obtained from milled powders, MgTi2O5 was detected in EDS spectra in a lower amount, below the threshold of the XRD method. Dielectric measurements were performed at a wide range of frequencies and temperatures. The highest value of the hardness was obtained from powder milled for 15 min before SPS.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Effect of high energy ball milling on sintering of MgO-TiO2 system
SP  - 88
EP  - 88
UR  - https://hdl.handle.net/21.15107/rcub_dais_13622
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Fahrenholtz, William G. and Smith, Steven and Mirković, M. and Peleš Tadić, Adriana and Tadić, Nenad and Đorđević, Antonije",
year = "2022",
abstract = "Perovskite ceramic material based on MgTiO3 is used in various types of electronic devices owing to its dielectric properties, high dielectric constant, and low losses. These features can be tailored by setting preparation conditions. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work. First, the mechanical activation in the highenergy ball mill was applied on the powder of MgO-TiO2 mixed in mole ratio 1:1. Prepared powder mixtures, activated for different times, were SPS sintered, at 1200 oC with a heating rate of 100oC/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied, and dwelled at this condition for 5 min, followed by cooling to room temperature at 5oC/min. The starting powders, activated mixtures, and sintered ceramics bodies were investigated by X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The presence of the MgTi2O5 phase was noticed for the nonmilled ceramics. In the samples obtained from milled powders, MgTi2O5 was detected in EDS spectra in a lower amount, below the threshold of the XRD method. Dielectric measurements were performed at a wide range of frequencies and temperatures. The highest value of the hardness was obtained from powder milled for 15 min before SPS.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Effect of high energy ball milling on sintering of MgO-TiO2 system",
pages = "88-88",
url = "https://hdl.handle.net/21.15107/rcub_dais_13622"
}
Filipović, S., Obradović, N., Fahrenholtz, W. G., Smith, S., Mirković, M., Peleš Tadić, A., Tadić, N.,& Đorđević, A.. (2022). Effect of high energy ball milling on sintering of MgO-TiO2 system. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 88-88.
https://hdl.handle.net/21.15107/rcub_dais_13622
Filipović S, Obradović N, Fahrenholtz WG, Smith S, Mirković M, Peleš Tadić A, Tadić N, Đorđević A. Effect of high energy ball milling on sintering of MgO-TiO2 system. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:88-88.
https://hdl.handle.net/21.15107/rcub_dais_13622 .
Filipović, Suzana, Obradović, Nina, Fahrenholtz, William G., Smith, Steven, Mirković, M., Peleš Tadić, Adriana, Tadić, Nenad, Đorđević, Antonije, "Effect of high energy ball milling on sintering of MgO-TiO2 system" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):88-88,
https://hdl.handle.net/21.15107/rcub_dais_13622 .

Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics

Stojanović, Nemanja; Kalezić-Glišović, Aleksandra; Obradović, Nina; Lojpur, Vesna; Kesić, Željka; Maričić, Aleksa

(Belgrade : Serbian Ceramic Society, 2022)

TY  - CONF
AU  - Stojanović, Nemanja
AU  - Kalezić-Glišović, Aleksandra
AU  - Obradović, Nina
AU  - Lojpur, Vesna
AU  - Kesić, Željka
AU  - Maričić, Aleksa
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13623
AB  - Powdery mixtures of 50 mass% Fe, 4 mass% Pb, 3 mass% Zr and 43 mass% BaTiO3 were mechanochemically activated via planetary ball mill for time periods spanning from 30 min to 300 min and subsequently sintered for 2 hours at 1200 °C in the dynamic atmosphere of air. Of all the samples, the one activated for 270 min exibited the most prominent piezoelectric effect of up to 1.17 mV under the applied pressure of 113 kPa with the relaxation time of 85 s. The pressure dependence of voltage showed three successive, distinct domains in which the voltage rise differed, with the rate of 0.09 mV/kPa in the initial one (ranging from 0.00 kPa to 5.66 kPa of the external pressure), 0.01 mV/kPa in the second one (from 5.66 kPa to 56.60 kPa) and ultimately the plateau occuring from approximately 60 kPa onwards. When heated to 200 °C, the same sample manifested the biggest pyroelectric effect as well, being 0.55 mV with no external field applied, as well as 1.04 mV when subjected to the homogenous magnetic field of 50 kA/m, thus yielding a 89% net increase of the incited voltage observed.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics
SP  - 91
EP  - 91
UR  - https://hdl.handle.net/21.15107/rcub_dais_13623
ER  - 
@conference{
author = "Stojanović, Nemanja and Kalezić-Glišović, Aleksandra and Obradović, Nina and Lojpur, Vesna and Kesić, Željka and Maričić, Aleksa",
year = "2022",
abstract = "Powdery mixtures of 50 mass% Fe, 4 mass% Pb, 3 mass% Zr and 43 mass% BaTiO3 were mechanochemically activated via planetary ball mill for time periods spanning from 30 min to 300 min and subsequently sintered for 2 hours at 1200 °C in the dynamic atmosphere of air. Of all the samples, the one activated for 270 min exibited the most prominent piezoelectric effect of up to 1.17 mV under the applied pressure of 113 kPa with the relaxation time of 85 s. The pressure dependence of voltage showed three successive, distinct domains in which the voltage rise differed, with the rate of 0.09 mV/kPa in the initial one (ranging from 0.00 kPa to 5.66 kPa of the external pressure), 0.01 mV/kPa in the second one (from 5.66 kPa to 56.60 kPa) and ultimately the plateau occuring from approximately 60 kPa onwards. When heated to 200 °C, the same sample manifested the biggest pyroelectric effect as well, being 0.55 mV with no external field applied, as well as 1.04 mV when subjected to the homogenous magnetic field of 50 kA/m, thus yielding a 89% net increase of the incited voltage observed.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics",
pages = "91-91",
url = "https://hdl.handle.net/21.15107/rcub_dais_13623"
}
Stojanović, N., Kalezić-Glišović, A., Obradović, N., Lojpur, V., Kesić, Ž.,& Maričić, A.. (2022). Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 91-91.
https://hdl.handle.net/21.15107/rcub_dais_13623
Stojanović N, Kalezić-Glišović A, Obradović N, Lojpur V, Kesić Ž, Maričić A. Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:91-91.
https://hdl.handle.net/21.15107/rcub_dais_13623 .
Stojanović, Nemanja, Kalezić-Glišović, Aleksandra, Obradović, Nina, Lojpur, Vesna, Kesić, Željka, Maričić, Aleksa, "Piezoelectric And Pyroelectric Properties Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):91-91,
https://hdl.handle.net/21.15107/rcub_dais_13623 .

Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system

Filipović, Suzana; Obradović, Nina; Gilli, Nicola; Silvestroni, Laura

(Krakow : Agencja Reklamowa EURO GRAPHIC, 2022)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Gilli, Nicola
AU  - Silvestroni, Laura
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13119
AB  - Ultra-high temperature ceramics, such as ZrB2, are convenient for application in hypersonic systems due to melting point higher than 3000 °C and excellent ablation resistance. For such application further improvement by addition
of second phases, including SiC or CrB2, has additional benefits in domain of oxidation behavior, while TiB, doping reduces material's weight. A powder mixture of ZrB2, TiB2, CrB, and SiC was high energy ball-mill trough four steps. Obtained milled powder was subjected to hot pressing following different thermal cycles. Subsequent annealing was applied to remove oxide phases and reduce micro-cracking. Due to different thermal treatment, various microstructure and hardness occur. We reached fully dense ceramics, and with different oxide-phases content depending on sintering conditions. Maximal obtained hardness was 24 GPa. Ongoing activity regards the study of the strength and oxidation resistance to assess the suitability of this multi-phase system for hypersonic applications.
PB  - Krakow : Agencja Reklamowa EURO GRAPHIC
PB  - Krakow : Polskie Towarzystwo Ceramiczne
C3  - Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July
T1  - Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system
SP  - 77
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_dais_13119
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Gilli, Nicola and Silvestroni, Laura",
year = "2022",
abstract = "Ultra-high temperature ceramics, such as ZrB2, are convenient for application in hypersonic systems due to melting point higher than 3000 °C and excellent ablation resistance. For such application further improvement by addition
of second phases, including SiC or CrB2, has additional benefits in domain of oxidation behavior, while TiB, doping reduces material's weight. A powder mixture of ZrB2, TiB2, CrB, and SiC was high energy ball-mill trough four steps. Obtained milled powder was subjected to hot pressing following different thermal cycles. Subsequent annealing was applied to remove oxide phases and reduce micro-cracking. Due to different thermal treatment, various microstructure and hardness occur. We reached fully dense ceramics, and with different oxide-phases content depending on sintering conditions. Maximal obtained hardness was 24 GPa. Ongoing activity regards the study of the strength and oxidation resistance to assess the suitability of this multi-phase system for hypersonic applications.",
publisher = "Krakow : Agencja Reklamowa EURO GRAPHIC, Krakow : Polskie Towarzystwo Ceramiczne",
journal = "Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July",
title = "Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_dais_13119"
}
Filipović, S., Obradović, N., Gilli, N.,& Silvestroni, L.. (2022). Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system. in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July
Krakow : Agencja Reklamowa EURO GRAPHIC., 77-77.
https://hdl.handle.net/21.15107/rcub_dais_13119
Filipović S, Obradović N, Gilli N, Silvestroni L. Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system. in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July. 2022;:77-77.
https://hdl.handle.net/21.15107/rcub_dais_13119 .
Filipović, Suzana, Obradović, Nina, Gilli, Nicola, Silvestroni, Laura, "Mechanical activation and HIP of ZrB2-TIB2 based composites for hypersonic system" in Abstract Book / Ceramics in Europe 2022, Krakow, 10-14 July (2022):77-77,
https://hdl.handle.net/21.15107/rcub_dais_13119 .

Spark plasma sintering of mechanically activated MGO-TiO2 system

Filipović, Suzana; Obradović, Nina; Fahrenholtz, William G.; Smith, Steven; Mirković, Miljana M.; Peleš, Adriana; Đorđević, Antonije

(Belgrade : Innovation Center of Faculty of Mechanical Engineering, 2022)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Smith, Steven
AU  - Mirković, Miljana M.
AU  - Peleš, Adriana
AU  - Đorđević, Antonije
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13118
AB  - MgTiO3 is a material often used in different types of high-frequency capacitors, temperature compensating capacitors, and chip capacitors, so the enhancement of this material is still the focus of many research groups due to its remarkable dielectric properties. Outstanding features can only be achieved when the ceramics are highly dense. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work. Magnesium titanate ceramics were prepared by applying mechanical activation as the first step. Powders prepared in this way were SPS sintered, at 1200 °C with a heating rate of 100 °C/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied. The dwell time at this condition was 5 min, followed by cooling to room temperature at 5°C/min. X-ray diffraction was performed in order to establish the phase composition of milled powders and obtained ceramics. Differences between samples milled in various times intervals, as well as sintered ceramics were examined by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The presence of MgTiz0s phase was detected in XRD and was confirmed by EDS analysis for the non-milled ceramics. In the samples obtained from milled powders, no MgTi2O5 was detected in XRD patterns, but this phase was detected in EDS spectra in a lower amount. Dielectric measurements were performed at a wide range of frequencies, while the hardness of the SPS samples was measured at loads up to 10 N. The highest value of the hardness was obtained from powder milled for 15 min before SPS.
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 2022, 05-08 July 2022, Zlatibor, Serbia
T1  - Spark plasma sintering of mechanically activated MGO-TiO2 system
SP  - 81
EP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_dais_13118
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Fahrenholtz, William G. and Smith, Steven and Mirković, Miljana M. and Peleš, Adriana and Đorđević, Antonije",
year = "2022",
abstract = "MgTiO3 is a material often used in different types of high-frequency capacitors, temperature compensating capacitors, and chip capacitors, so the enhancement of this material is still the focus of many research groups due to its remarkable dielectric properties. Outstanding features can only be achieved when the ceramics are highly dense. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work. Magnesium titanate ceramics were prepared by applying mechanical activation as the first step. Powders prepared in this way were SPS sintered, at 1200 °C with a heating rate of 100 °C/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied. The dwell time at this condition was 5 min, followed by cooling to room temperature at 5°C/min. X-ray diffraction was performed in order to establish the phase composition of milled powders and obtained ceramics. Differences between samples milled in various times intervals, as well as sintered ceramics were examined by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The presence of MgTiz0s phase was detected in XRD and was confirmed by EDS analysis for the non-milled ceramics. In the samples obtained from milled powders, no MgTi2O5 was detected in XRD patterns, but this phase was detected in EDS spectra in a lower amount. Dielectric measurements were performed at a wide range of frequencies, while the hardness of the SPS samples was measured at loads up to 10 N. The highest value of the hardness was obtained from powder milled for 15 min before SPS.",
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 2022, 05-08 July 2022, Zlatibor, Serbia",
title = "Spark plasma sintering of mechanically activated MGO-TiO2 system",
pages = "81-81",
url = "https://hdl.handle.net/21.15107/rcub_dais_13118"
}
Filipović, S., Obradović, N., Fahrenholtz, W. G., Smith, S., Mirković, M. M., Peleš, A.,& Đorđević, A.. (2022). Spark plasma sintering of mechanically activated MGO-TiO2 system. in Programme 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., 81-81.
https://hdl.handle.net/21.15107/rcub_dais_13118
Filipović S, Obradović N, Fahrenholtz WG, Smith S, Mirković MM, Peleš A, Đorđević A. Spark plasma sintering of mechanically activated MGO-TiO2 system. in Programme 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;:81-81.
https://hdl.handle.net/21.15107/rcub_dais_13118 .
Filipović, Suzana, Obradović, Nina, Fahrenholtz, William G., Smith, Steven, Mirković, Miljana M., Peleš, Adriana, Đorđević, Antonije, "Spark plasma sintering of mechanically activated MGO-TiO2 system" in Programme 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):81-81,
https://hdl.handle.net/21.15107/rcub_dais_13118 .

Influence of mechanically activated ZnO powder content as a filler of polymer nanocomposites

Peleš Tadić, Adriana; Obradović, Nina; Kosanović, Darko; Blagojević, Vladimir A.; Pavlović, Vladimir B.

(Belgrade : Innovation Center of Faculty of Mechanical Engineering, 2022)

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 .

Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]

Filipović, Suzana; Obradović, Nina; Fahrenholtz, William G.; Smith, Steven; Mirković, Miljana; Peleš, Adriana; Đorđević, Antonije

(Belgrade : Innovation Center of Faculty of Mechanical Engineering, 2022)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Smith, Steven
AU  - Mirković, Miljana
AU  - Peleš, Adriana
AU  - Đorđević, Antonije
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13599
AB  - MgTiO3 is a material often used in different types of high-frequency capacitors, temperature compensating capacitors, and chip capacitors, so the enhancement of this material is still the focus of many research groups due to its remarkable dielectric properties. Outstanding features can only be achieved when the ceramics are highly dense. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work.
Magnesium titanate ceramics were prepared by applying mechanical activation as the first step. Powders prepared in this way were SPS sintered, at 1200°C with a heating rate of 100°C/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied. The dwell time at this condition was 5 min, followed by cooling to room temperature at 5°C/min. X-ray diffraction was performed in order to establish the phase composition of milled powders and obtained ceramics. Differences between samples milled in various times intervals, as well as sintered ceramics were examined by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The presence of MgTi2O5 phase was detected in XRD and was confirmed by EDS analysis for the non-milled ceramics. In the samples obtained from milled powders, no MgTi2O5 wasn’t detected in XRD patterns, but this phase was detected in EDS spectra in a lower amount. Dielectric measurements were performed at a wide range of frequencies, while the hardness of the SPS samples was measured at loads up to 10 N. The highest value of the hardness was obtained from powder milled for 15 min before SPS.
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  - Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]
SP  - 81
EP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_dais_13599
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Fahrenholtz, William G. and Smith, Steven and Mirković, Miljana and Peleš, Adriana and Đorđević, Antonije",
year = "2022",
abstract = "MgTiO3 is a material often used in different types of high-frequency capacitors, temperature compensating capacitors, and chip capacitors, so the enhancement of this material is still the focus of many research groups due to its remarkable dielectric properties. Outstanding features can only be achieved when the ceramics are highly dense. Densification of magnesium titanate by Spark Plasma Sintering (SPS) was the aim of this work.
Magnesium titanate ceramics were prepared by applying mechanical activation as the first step. Powders prepared in this way were SPS sintered, at 1200°C with a heating rate of 100°C/min. After reaching the desired temperature, a uniaxial pressure of 50 MPa was applied. The dwell time at this condition was 5 min, followed by cooling to room temperature at 5°C/min. X-ray diffraction was performed in order to establish the phase composition of milled powders and obtained ceramics. Differences between samples milled in various times intervals, as well as sintered ceramics were examined by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The presence of MgTi2O5 phase was detected in XRD and was confirmed by EDS analysis for the non-milled ceramics. In the samples obtained from milled powders, no MgTi2O5 wasn’t detected in XRD patterns, but this phase was detected in EDS spectra in a lower amount. Dielectric measurements were performed at a wide range of frequencies, while the hardness of the SPS samples was measured at loads up to 10 N. The highest value of the hardness was obtained from powder milled for 15 min before SPS.",
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 = "Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]",
pages = "81-81",
url = "https://hdl.handle.net/21.15107/rcub_dais_13599"
}
Filipović, S., Obradović, N., Fahrenholtz, W. G., Smith, S., Mirković, M., Peleš, A.,& Đorđević, A.. (2022). Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]. 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., 81-81.
https://hdl.handle.net/21.15107/rcub_dais_13599
Filipović S, Obradović N, Fahrenholtz WG, Smith S, Mirković M, Peleš A, Đorđević A. Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]. 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;:81-81.
https://hdl.handle.net/21.15107/rcub_dais_13599 .
Filipović, Suzana, Obradović, Nina, Fahrenholtz, William G., Smith, Steven, Mirković, Miljana, Peleš, Adriana, Đorđević, Antonije, "Spark plasma sintering of mechanically activated MgO-TiO2 system : [invited lecture]" 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):81-81,
https://hdl.handle.net/21.15107/rcub_dais_13599 .

Mechanical Activation and Cation Site Disorder in MgAl2O4

Corlett, Cole A.; Frontzek, Matthias D.; Obradović, Nina; Watts, Jeremy L.; Fahrenholtz, William G.

(2022)

TY  - JOUR
AU  - Corlett, Cole A.
AU  - Frontzek, Matthias D.
AU  - Obradović, Nina
AU  - Watts, Jeremy L.
AU  - Fahrenholtz, William G.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13516
AB  - The synthesis and crystallographic site occupancy were investigated for MgAl2O4 with and without mechanical activation of the precursor powders. Heating to 1200 °C or higher resulted in the formation of a single spinel phase regardless of whether the powders were mechanically activated or not. Neutron diffraction analysis was used to determine cation site occupancy and revealed that mechanical activation resulted in a lower degree of cation site inversion compared to the nonactivated materials, which indicated that the powders were closer to thermodynamic equilibrium. This is the first study to characterize the effects of mechanical activation on crystallographic site occupancy in magnesium aluminate spinel using neutron diffraction. © 2022 by the authors.
T2  - Materials
T1  - Mechanical Activation and Cation Site Disorder in MgAl2O4
VL  - 15
IS  - 18
DO  - 10.3390/ma15186422
UR  - https://hdl.handle.net/21.15107/rcub_dais_13516
ER  - 
@article{
author = "Corlett, Cole A. and Frontzek, Matthias D. and Obradović, Nina and Watts, Jeremy L. and Fahrenholtz, William G.",
year = "2022",
abstract = "The synthesis and crystallographic site occupancy were investigated for MgAl2O4 with and without mechanical activation of the precursor powders. Heating to 1200 °C or higher resulted in the formation of a single spinel phase regardless of whether the powders were mechanically activated or not. Neutron diffraction analysis was used to determine cation site occupancy and revealed that mechanical activation resulted in a lower degree of cation site inversion compared to the nonactivated materials, which indicated that the powders were closer to thermodynamic equilibrium. This is the first study to characterize the effects of mechanical activation on crystallographic site occupancy in magnesium aluminate spinel using neutron diffraction. © 2022 by the authors.",
journal = "Materials",
title = "Mechanical Activation and Cation Site Disorder in MgAl2O4",
volume = "15",
number = "18",
doi = "10.3390/ma15186422",
url = "https://hdl.handle.net/21.15107/rcub_dais_13516"
}
Corlett, C. A., Frontzek, M. D., Obradović, N., Watts, J. L.,& Fahrenholtz, W. G.. (2022). Mechanical Activation and Cation Site Disorder in MgAl2O4. in Materials, 15(18).
https://doi.org/10.3390/ma15186422
https://hdl.handle.net/21.15107/rcub_dais_13516
Corlett CA, Frontzek MD, Obradović N, Watts JL, Fahrenholtz WG. Mechanical Activation and Cation Site Disorder in MgAl2O4. in Materials. 2022;15(18).
doi:10.3390/ma15186422
https://hdl.handle.net/21.15107/rcub_dais_13516 .
Corlett, Cole A., Frontzek, Matthias D., Obradović, Nina, Watts, Jeremy L., Fahrenholtz, William G., "Mechanical Activation and Cation Site Disorder in MgAl2O4" in Materials, 15, no. 18 (2022),
https://doi.org/10.3390/ma15186422 .,
https://hdl.handle.net/21.15107/rcub_dais_13516 .

Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent

Popović, Mina; Veličković, Zlate S.; Bogdanov, Jovica; Marinković, Aleksandar D.; Luna, Mariano Casas; Trajković, Isaak; Obradović, Nina; Pavlović, Vladimir B.

(International Institute for the Science of Sintering (IISS), 2022)

TY  - JOUR
AU  - Popović, Mina
AU  - Veličković, Zlate S.
AU  - Bogdanov, Jovica
AU  - Marinković, Aleksandar D.
AU  - Luna, Mariano Casas
AU  - Trajković, Isaak
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/12955
AB  - In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal-one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ•mol-1 for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g-1 for As(V) and Cr(VI) at 2o C, Co = 5.5 and 5.3 mg L-1, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.
PB  - International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent
SP  - 105
EP  - 124
VL  - 54
IS  - 1
DO  - 10.2298/SOS2201105P
UR  - https://hdl.handle.net/21.15107/rcub_dais_12955
ER  - 
@article{
author = "Popović, Mina and Veličković, Zlate S. and Bogdanov, Jovica and Marinković, Aleksandar D. and Luna, Mariano Casas and Trajković, Isaak and Obradović, Nina and Pavlović, Vladimir B.",
year = "2022",
abstract = "In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal-one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ•mol-1 for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g-1 for As(V) and Cr(VI) at 2o C, Co = 5.5 and 5.3 mg L-1, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.",
publisher = "International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent",
pages = "105-124",
volume = "54",
number = "1",
doi = "10.2298/SOS2201105P",
url = "https://hdl.handle.net/21.15107/rcub_dais_12955"
}
Popović, M., Veličković, Z. S., Bogdanov, J., Marinković, A. D., Luna, M. C., Trajković, I., Obradović, N.,& Pavlović, V. B.. (2022). Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent. in Science of Sintering
International Institute for the Science of Sintering (IISS)., 54(1), 105-124.
https://doi.org/10.2298/SOS2201105P
https://hdl.handle.net/21.15107/rcub_dais_12955
Popović M, Veličković ZS, Bogdanov J, Marinković AD, Luna MC, Trajković I, Obradović N, Pavlović VB. Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent. in Science of Sintering. 2022;54(1):105-124.
doi:10.2298/SOS2201105P
https://hdl.handle.net/21.15107/rcub_dais_12955 .
Popović, Mina, Veličković, Zlate S., Bogdanov, Jovica, Marinković, Aleksandar D., Luna, Mariano Casas, Trajković, Isaak, Obradović, Nina, Pavlović, Vladimir B., "Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent" in Science of Sintering, 54, no. 1 (2022):105-124,
https://doi.org/10.2298/SOS2201105P .,
https://hdl.handle.net/21.15107/rcub_dais_12955 .
1
1

High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies

Petrović, Jovana G.; Olćan, Dragan I.; Obradović, Nina N.; Đorđević, Antonije R.

(Institute of Electrical and Electronics Engineers (IEEE), 2022)

TY  - JOUR
AU  - Petrović, Jovana G.
AU  - Olćan, Dragan I.
AU  - Obradović, Nina N.
AU  - Đorđević, Antonije R.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/12534
AB  - A novel high-precision model of a custom-made coaxial chamber used for broadband measurement of the relative complex permittivity at microwave frequencies is presented. The model is based on a surface integral-equation formulation of the method of moments tailored for bodies of revolution. All singular integrals encountered in the numerical analysis are calculated in a unified way with a novel integral transformation, which enables the precision of up to 12 significant digits using the 64-bit representation of real numbers. The dielectric parameters are estimated from the reflection-coefficient measurement of the chamber with a disk-shaped dielectric sample by comparison of the measured data with the high-precision numerical analysis of the chamber. The complete measurement procedure is illustrated and verified using samples of known dielectric properties.
PB  - Institute of Electrical and Electronics Engineers (IEEE)
T2  - IEEE Transactions on Microwave Theory and Techniques
T1  - High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies
SP  - 970
EP  - 979
VL  - 70
IS  - 2
DO  - 10.1109/TMTT.2021.3136294
UR  - https://hdl.handle.net/21.15107/rcub_dais_12534
ER  - 
@article{
author = "Petrović, Jovana G. and Olćan, Dragan I. and Obradović, Nina N. and Đorđević, Antonije R.",
year = "2022",
abstract = "A novel high-precision model of a custom-made coaxial chamber used for broadband measurement of the relative complex permittivity at microwave frequencies is presented. The model is based on a surface integral-equation formulation of the method of moments tailored for bodies of revolution. All singular integrals encountered in the numerical analysis are calculated in a unified way with a novel integral transformation, which enables the precision of up to 12 significant digits using the 64-bit representation of real numbers. The dielectric parameters are estimated from the reflection-coefficient measurement of the chamber with a disk-shaped dielectric sample by comparison of the measured data with the high-precision numerical analysis of the chamber. The complete measurement procedure is illustrated and verified using samples of known dielectric properties.",
publisher = "Institute of Electrical and Electronics Engineers (IEEE)",
journal = "IEEE Transactions on Microwave Theory and Techniques",
title = "High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies",
pages = "970-979",
volume = "70",
number = "2",
doi = "10.1109/TMTT.2021.3136294",
url = "https://hdl.handle.net/21.15107/rcub_dais_12534"
}
Petrović, J. G., Olćan, D. I., Obradović, N. N.,& Đorđević, A. R.. (2022). High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies. in IEEE Transactions on Microwave Theory and Techniques
Institute of Electrical and Electronics Engineers (IEEE)., 70(2), 970-979.
https://doi.org/10.1109/TMTT.2021.3136294
https://hdl.handle.net/21.15107/rcub_dais_12534
Petrović JG, Olćan DI, Obradović NN, Đorđević AR. High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies. in IEEE Transactions on Microwave Theory and Techniques. 2022;70(2):970-979.
doi:10.1109/TMTT.2021.3136294
https://hdl.handle.net/21.15107/rcub_dais_12534 .
Petrović, Jovana G., Olćan, Dragan I., Obradović, Nina N., Đorđević, Antonije R., "High-Precision Method of Moments Applied to Measurement of Dielectric Parameters at Microwave Frequencies" in IEEE Transactions on Microwave Theory and Techniques, 70, no. 2 (2022):970-979,
https://doi.org/10.1109/TMTT.2021.3136294 .,
https://hdl.handle.net/21.15107/rcub_dais_12534 .

Dielectric characteristics of polymer nanocomposites based on PVDF and mechanically activated ZnO powder

Peleš Tadić, Adriana; Obradović, Nina; Kosanović, Darko; Petrović, J.; Blagojević, Vladimir A.; Đorđević, Antonije; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2021)

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 .

Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software

Obradović, Nina; Peleš, Adriana; Olćan, Dragan; Fahrenholtz, William G.; Đorđević, Antonije; Pavlović, Vladimir B.

(Belgrade : Innovation Center of Faculty of Mechanical Engineering, 2021)

TY  - CONF
AU  - Obradović, Nina
AU  - Peleš, Adriana
AU  - Olćan, Dragan
AU  - Fahrenholtz, William G.
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12351
AB  - Our research group has developed a method for measurement of complex relative permittivity of various dielectric materials in the frequency range from around 1 kHz up to several GHz. Material samples have preferably a disk shape. The thicknesses of the samples can be in a wide range, from about 10 μm (thick films) up to several mm. We have designed and manufactured a set of coaxial chambers, which we use as test fixtures. We have also developed two numerical-simulation programs for the electromagnetic analysis of bodies with rotational symmetry. One program is suitable for the low-frequency analysis. It is based on an electrostatic approach. The other program is based on an electrodynamic approach and it is tailored for microwave frequencies. In measurements, we use impedance meters and network analyzers to obtain the input impedance of a chamber with a sample. Thereafter, we implement our software for the electromagnetic modeling to extract the relative permittivity of the measured sample. As examples of verification of our method, we present here results for the relative permittivities of two sets of samples whose sizes are on the extreme limits of the method. The first set comprises poly (vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films, whose relative permittivities are around 1.8. The second set comprises large, high-density samples of spinel (aluminum magnesium oxide) ceramics, sintered under various conditions. The measured relative permittivities of these samples are around 7.5. In all cases, good agreement with other available data has been obtained.
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  - Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software
SP  - 82
EP  - 82
UR  - https://hdl.handle.net/21.15107/rcub_dais_12351
ER  - 
@conference{
author = "Obradović, Nina and Peleš, Adriana and Olćan, Dragan and Fahrenholtz, William G. and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2021",
abstract = "Our research group has developed a method for measurement of complex relative permittivity of various dielectric materials in the frequency range from around 1 kHz up to several GHz. Material samples have preferably a disk shape. The thicknesses of the samples can be in a wide range, from about 10 μm (thick films) up to several mm. We have designed and manufactured a set of coaxial chambers, which we use as test fixtures. We have also developed two numerical-simulation programs for the electromagnetic analysis of bodies with rotational symmetry. One program is suitable for the low-frequency analysis. It is based on an electrostatic approach. The other program is based on an electrodynamic approach and it is tailored for microwave frequencies. In measurements, we use impedance meters and network analyzers to obtain the input impedance of a chamber with a sample. Thereafter, we implement our software for the electromagnetic modeling to extract the relative permittivity of the measured sample. As examples of verification of our method, we present here results for the relative permittivities of two sets of samples whose sizes are on the extreme limits of the method. The first set comprises poly (vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films, whose relative permittivities are around 1.8. The second set comprises large, high-density samples of spinel (aluminum magnesium oxide) ceramics, sintered under various conditions. The measured relative permittivities of these samples are around 7.5. In all cases, good agreement with other available data has been obtained.",
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 = "Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software",
pages = "82-82",
url = "https://hdl.handle.net/21.15107/rcub_dais_12351"
}
Obradović, N., Peleš, A., Olćan, D., Fahrenholtz, W. G., Đorđević, A.,& Pavlović, V. B.. (2021). Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software. 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., 82-82.
https://hdl.handle.net/21.15107/rcub_dais_12351
Obradović N, Peleš A, Olćan D, Fahrenholtz WG, Đorđević A, Pavlović VB. Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software. 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;:82-82.
https://hdl.handle.net/21.15107/rcub_dais_12351 .
Obradović, Nina, Peleš, Adriana, Olćan, Dragan, Fahrenholtz, William G., Đorđević, Antonije, Pavlović, Vladimir B., "Measurement of dielectric permitivity using coaxial chambers and electromagnetic-modeling software" 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):82-82,
https://hdl.handle.net/21.15107/rcub_dais_12351 .

Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics

Đorđević, Nataša; Peleš, Adriana; Obradović, Nina; Vlahović, Milica; Mihajlović, Slavica; Martinović, Sanja

(Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, 2021)

TY  - CONF
AU  - Đorđević, Nataša
AU  - Peleš, Adriana
AU  - Obradović, Nina
AU  - Vlahović, Milica
AU  - Mihajlović, Slavica
AU  - Martinović, Sanja
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12354
AB  - The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with 5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure of both compacted and sintered samples. Atomic force microscope was used to investigate the surface of the sintered samples. This paper investigates the influence of prolonged sintering time on the densities of the sintered samples, along with electrical properties.
AB  - Mehanička aktivacija početnih smeša kordierita (2MgO*2Al2O3*5SiO2) sa 5.00 mas. % TiO2 izvršena je u visokoenergetskom mlinu sa kuglama tokom 10-80 min. Primenjeni pritisak presovanja pre procesa sinterovanja bio je 2 t/cm2. Proces sinterovanja je izveden na 1350 °C tokom 2h i 4h u vazdušnoj atmosferi. Skenirajuća elektronska mikroskopija je izvršena u cilju analize mikrostrukture presovanih i sinterovanih uzoraka. Za ispitivanje površine sinterovanih uzoraka korišćen je mikroskop atomskih sila. Ovaj rad istražuje uticaj produženog vremena sinterovanja na gustinu sinterovanih uzoraka zajedno sa električnim svojstvima.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS
C3  - Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021
T1  - Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics
T1  - Uticaj vremena sinterovanja na gustinu i SEM analiza kordijeritne keramike
SP  - 265
EP  - 268
UR  - https://hdl.handle.net/21.15107/rcub_dais_12354
ER  - 
@conference{
author = "Đorđević, Nataša and Peleš, Adriana and Obradović, Nina and Vlahović, Milica and Mihajlović, Slavica and Martinović, Sanja",
year = "2021",
abstract = "The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with 5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure of both compacted and sintered samples. Atomic force microscope was used to investigate the surface of the sintered samples. This paper investigates the influence of prolonged sintering time on the densities of the sintered samples, along with electrical properties., Mehanička aktivacija početnih smeša kordierita (2MgO*2Al2O3*5SiO2) sa 5.00 mas. % TiO2 izvršena je u visokoenergetskom mlinu sa kuglama tokom 10-80 min. Primenjeni pritisak presovanja pre procesa sinterovanja bio je 2 t/cm2. Proces sinterovanja je izveden na 1350 °C tokom 2h i 4h u vazdušnoj atmosferi. Skenirajuća elektronska mikroskopija je izvršena u cilju analize mikrostrukture presovanih i sinterovanih uzoraka. Za ispitivanje površine sinterovanih uzoraka korišćen je mikroskop atomskih sila. Ovaj rad istražuje uticaj produženog vremena sinterovanja na gustinu sinterovanih uzoraka zajedno sa električnim svojstvima.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS",
journal = "Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021",
title = "Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics, Uticaj vremena sinterovanja na gustinu i SEM analiza kordijeritne keramike",
pages = "265-268",
url = "https://hdl.handle.net/21.15107/rcub_dais_12354"
}
Đorđević, N., Peleš, A., Obradović, N., Vlahović, M., Mihajlović, S.,& Martinović, S.. (2021). Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics. in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS., 265-268.
https://hdl.handle.net/21.15107/rcub_dais_12354
Đorđević N, Peleš A, Obradović N, Vlahović M, Mihajlović S, Martinović S. Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics. in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021. 2021;:265-268.
https://hdl.handle.net/21.15107/rcub_dais_12354 .
Đorđević, Nataša, Peleš, Adriana, Obradović, Nina, Vlahović, Milica, Mihajlović, Slavica, Martinović, Sanja, "Influence of sintering time on density properties and SEM analysis of cordierite-based ceramics" in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021 (2021):265-268,
https://hdl.handle.net/21.15107/rcub_dais_12354 .

Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time

Đorđević, Nataša; Peleš, Adriana; Obradović, Nina; Vlahović, Milica; Mihajlović, Slavica; Martinović, Sanja

(Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, 2021)

TY  - CONF
AU  - Đorđević, Nataša
AU  - Peleš, Adriana
AU  - Obradović, Nina
AU  - Vlahović, Milica
AU  - Mihajlović, Slavica
AU  - Martinović, Sanja
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12355
AB  - The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with 5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure of both compacted and sintered samples. Atomic force microscope was used to investigate the surface of the sintered samples. This paper investigates the influence of prolonged sintering time on the densities of the sintered samples, along with electrical properties.
AB  - Mehanička aktivacija početnih smeša kordierita (2MgO*2Al2O3*5SiO2) sa 5.00 mas. % TiO2 izvršena je u visokoenergetskom mlinu sa kuglama tokom 10-80 min. Primenjeni pritisak presovanja pre procesa sinterovanja bio je 2 t/cm2. Proces sinterovanja je izveden na 1350 °C tokom 2h i 4h u vazdušnoj atmosferi. Skenirajuća elektronska mikroskopija je izvršena u cilju analize mikrostrukture presovanih i sinterovanih uzoraka. Za ispitivanje površine sinterovanih uzoraka korišćen je mikroskop atomskih sila. Ovaj rad istražuje uticaj produženog vremena sinterovanja na gustinu sinterovanih uzoraka zajedno sa električnim svojstvima.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS
C3  - Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021
T1  - Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time
T1  - Električna svojstva izotermski sinterovane keramike na bazi kordierita kao funkcija vremena sinterovanja i aktivacije
SP  - 269
EP  - 272
UR  - https://hdl.handle.net/21.15107/rcub_dais_12355
ER  - 
@conference{
author = "Đorđević, Nataša and Peleš, Adriana and Obradović, Nina and Vlahović, Milica and Mihajlović, Slavica and Martinović, Sanja",
year = "2021",
abstract = "The mechanical activation of the starting mixtures of cordierite (2MgO*2Al2O3*5SiO2) with 5.00 mass % TiO2 was performed in a high energy ball mill during 10-80 min. The applied compaction pressure before the sintering process was 2t/cm2. The sintering process was performed at 1350°C for 2h and 4h in air atmosphere. Scanning electron microscopy was performed to analyze the microstructure of both compacted and sintered samples. Atomic force microscope was used to investigate the surface of the sintered samples. This paper investigates the influence of prolonged sintering time on the densities of the sintered samples, along with electrical properties., Mehanička aktivacija početnih smeša kordierita (2MgO*2Al2O3*5SiO2) sa 5.00 mas. % TiO2 izvršena je u visokoenergetskom mlinu sa kuglama tokom 10-80 min. Primenjeni pritisak presovanja pre procesa sinterovanja bio je 2 t/cm2. Proces sinterovanja je izveden na 1350 °C tokom 2h i 4h u vazdušnoj atmosferi. Skenirajuća elektronska mikroskopija je izvršena u cilju analize mikrostrukture presovanih i sinterovanih uzoraka. Za ispitivanje površine sinterovanih uzoraka korišćen je mikroskop atomskih sila. Ovaj rad istražuje uticaj produženog vremena sinterovanja na gustinu sinterovanih uzoraka zajedno sa električnim svojstvima.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS",
journal = "Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021",
title = "Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time, Električna svojstva izotermski sinterovane keramike na bazi kordierita kao funkcija vremena sinterovanja i aktivacije",
pages = "269-272",
url = "https://hdl.handle.net/21.15107/rcub_dais_12355"
}
Đorđević, N., Peleš, A., Obradović, N., Vlahović, M., Mihajlović, S.,& Martinović, S.. (2021). Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time. in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS., 269-272.
https://hdl.handle.net/21.15107/rcub_dais_12355
Đorđević N, Peleš A, Obradović N, Vlahović M, Mihajlović S, Martinović S. Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time. in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021. 2021;:269-272.
https://hdl.handle.net/21.15107/rcub_dais_12355 .
Đorđević, Nataša, Peleš, Adriana, Obradović, Nina, Vlahović, Milica, Mihajlović, Slavica, Martinović, Sanja, "Electrical properties of isothermally sintered cordierite-based ceramics as function of sintering and activation time" in Zbornik radova / 9. Međunarodna konferencija o obnovljivim izvorima električne energije, Beograd, 15. oktobar 2021 = Proceedings / 9th International Conference on Renewable Electrical Power Sources, Belgrade, October 15, 2021 (2021):269-272,
https://hdl.handle.net/21.15107/rcub_dais_12355 .

High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters

Đorđević, Antonije; Olćan, Dragan; Petrović, Jovana; Obradović, Nina; Filipović, Suzana

(National Library of Serbia, 2021)

TY  - JOUR
AU  - Đorđević, Antonije
AU  - Olćan, Dragan
AU  - Petrović, Jovana
AU  - Obradović, Nina
AU  - Filipović, Suzana
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12341
AB  - We have developed rotationally symmetrical coaxial chambers for measurements of dielectric parameters of disk-shaped samples, in the frequency range from 1 MHz to several hundred MHz. The reflection coefficient of the chamber is measured and the dielectric parameters are hence extracted utilizing a high-accuracy quasistatic numerical model of the chamber and the sample. We present this model, which is based on the method-of-moments solution of a set of integral equations for composite metallic and dielectric bodies. The equations are tailored to bodies of revolution. The model is efficient and accurate so that the major contribution of the measurement uncertainty comes from the measurement hardware.
PB  - National Library of Serbia
T2  - Facta universitatis - series: Electronics and Energetics
T1  - High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters
SP  - 141
EP  - 156
VL  - 34
IS  - 1
DO  - 10.2298/FUEE2101141D
UR  - https://hdl.handle.net/21.15107/rcub_dais_12341
ER  - 
@article{
author = "Đorđević, Antonije and Olćan, Dragan and Petrović, Jovana and Obradović, Nina and Filipović, Suzana",
year = "2021",
abstract = "We have developed rotationally symmetrical coaxial chambers for measurements of dielectric parameters of disk-shaped samples, in the frequency range from 1 MHz to several hundred MHz. The reflection coefficient of the chamber is measured and the dielectric parameters are hence extracted utilizing a high-accuracy quasistatic numerical model of the chamber and the sample. We present this model, which is based on the method-of-moments solution of a set of integral equations for composite metallic and dielectric bodies. The equations are tailored to bodies of revolution. The model is efficient and accurate so that the major contribution of the measurement uncertainty comes from the measurement hardware.",
publisher = "National Library of Serbia",
journal = "Facta universitatis - series: Electronics and Energetics",
title = "High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters",
pages = "141-156",
volume = "34",
number = "1",
doi = "10.2298/FUEE2101141D",
url = "https://hdl.handle.net/21.15107/rcub_dais_12341"
}
Đorđević, A., Olćan, D., Petrović, J., Obradović, N.,& Filipović, S.. (2021). High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters. in Facta universitatis - series: Electronics and Energetics
National Library of Serbia., 34(1), 141-156.
https://doi.org/10.2298/FUEE2101141D
https://hdl.handle.net/21.15107/rcub_dais_12341
Đorđević A, Olćan D, Petrović J, Obradović N, Filipović S. High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters. in Facta universitatis - series: Electronics and Energetics. 2021;34(1):141-156.
doi:10.2298/FUEE2101141D
https://hdl.handle.net/21.15107/rcub_dais_12341 .
Đorđević, Antonije, Olćan, Dragan, Petrović, Jovana, Obradović, Nina, Filipović, Suzana, "High-accuracy quasistatic numerical model for bodies of revolution tailored for RF measurements of dielectric parameters" in Facta universitatis - series: Electronics and Energetics, 34, no. 1 (2021):141-156,
https://doi.org/10.2298/FUEE2101141D .,
https://hdl.handle.net/21.15107/rcub_dais_12341 .
1
1

Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems

Obradović, Nina; Filipović, Suzana; Gilli, N.; Silvestroni, L.

(Belgrade : Innovation Center of Faculty of Mechanical Engineering, 2021)

TY  - CONF
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Gilli, N.
AU  - Silvestroni, L.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12352
AB  - ZrB2 ceramics are considered potential materials for hypersonic systems in view of the melting point exceeding 3000 °C and excellent ablation resistance. Second phases, including SiC or CrB2, further improve the oxidation behavior, whereas a lighter phase, like TiB2 can decrease the overall weight. In this work, a powder mixture containing ZrB2, TiB2, CrB2 and SiC was mechanically activated using high energy ball-milling. Sintering was performed by hot pressing following different thermal cycles, and subsequent annealing to remove oxide phases and reduce micro-cracking. The microstructure and hardness of the dense ceramics are compared in relationship to the thermal history. Fully dense ceramics were obtained with different oxide-phases amount depending on the sintering cycle and hardness approaching 24 GPa were achieved. Future works will explore the strength and oxidation resistance of this multi-phase system to check its suitability for hypersonic systems.
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  - Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems
SP  - 83
EP  - 83
UR  - https://hdl.handle.net/21.15107/rcub_dais_12352
ER  - 
@conference{
author = "Obradović, Nina and Filipović, Suzana and Gilli, N. and Silvestroni, L.",
year = "2021",
abstract = "ZrB2 ceramics are considered potential materials for hypersonic systems in view of the melting point exceeding 3000 °C and excellent ablation resistance. Second phases, including SiC or CrB2, further improve the oxidation behavior, whereas a lighter phase, like TiB2 can decrease the overall weight. In this work, a powder mixture containing ZrB2, TiB2, CrB2 and SiC was mechanically activated using high energy ball-milling. Sintering was performed by hot pressing following different thermal cycles, and subsequent annealing to remove oxide phases and reduce micro-cracking. The microstructure and hardness of the dense ceramics are compared in relationship to the thermal history. Fully dense ceramics were obtained with different oxide-phases amount depending on the sintering cycle and hardness approaching 24 GPa were achieved. Future works will explore the strength and oxidation resistance of this multi-phase system to check its suitability for hypersonic systems.",
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 = "Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems",
pages = "83-83",
url = "https://hdl.handle.net/21.15107/rcub_dais_12352"
}
Obradović, N., Filipović, S., Gilli, N.,& Silvestroni, L.. (2021). Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems. 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., 83-83.
https://hdl.handle.net/21.15107/rcub_dais_12352
Obradović N, Filipović S, Gilli N, Silvestroni L. Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems. 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;:83-83.
https://hdl.handle.net/21.15107/rcub_dais_12352 .
Obradović, Nina, Filipović, Suzana, Gilli, N., Silvestroni, L., "Preparation and characterization of ZrB2-TiB2 based composites for hypersonic systems" 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):83-83,
https://hdl.handle.net/21.15107/rcub_dais_12352 .

Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment

Stojanović, Nemanja; Zagorac, Dejan; Butulija, Svetlana; Lojpur, Vesna; Kalezić-Glišović, Aleksandra; Obradović, Nina; Maričić, Aleksa

(Belgrade : Serbian Ceramic Society, 2021)

TY  - CONF
AU  - Stojanović, Nemanja
AU  - Zagorac, Dejan
AU  - Butulija, Svetlana
AU  - Lojpur, Vesna
AU  - Kalezić-Glišović, Aleksandra
AU  - Obradović, Nina
AU  - Maričić, Aleksa
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11898
AB  - Mixtures of high purity powders of 50 mass% Fe, 4 mass% Pb, 3 mass% Zr and 43 mass% BaTiO3 were activated in a rotary ball mill for durations ranging from 30 min to 300 min; samples were then sintered in the air atmosphere for 2 hours at 1200 °C. Crystal structure prediction has been performed using Bond ValenceCalculation (BVC) method.Moreover, theoretical stability of theperovskite structure for synthesized and calculated Fe/Pb/Zr-codoped barium titanatecompounds has been investigated using the Goldschmidttolerance factor (Gt) and global instability index (GII).It was observed that magnetization of the system decreased after the sintering, with the most dramatic drop of 90.11% belonging to the sample activated for 150 min. In comparison with initial powders, X-ray powder diffractiondata confirmed the presence of newphases of BaFe12O19 and Ba1.696Ti0.228O3 in sintered samples. Utilizing the field emission scanning electron microscopy (FESEM), it was found that with the increase of activation time the morphology of the samples progressed from irregural, spherical grains to mostly rod-like ones. Energy dispersive X-ray (EDX) analysis identified the presence of Pb and Zr occupying the same locations on the surface of sintered samples, whilst Fe was uniformly deployed regardless of the activation time.
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  - Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment
SP  - 77
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_dais_11898
ER  - 
@conference{
author = "Stojanović, Nemanja and Zagorac, Dejan and Butulija, Svetlana and Lojpur, Vesna and Kalezić-Glišović, Aleksandra and Obradović, Nina and Maričić, Aleksa",
year = "2021",
abstract = "Mixtures of high purity powders of 50 mass% Fe, 4 mass% Pb, 3 mass% Zr and 43 mass% BaTiO3 were activated in a rotary ball mill for durations ranging from 30 min to 300 min; samples were then sintered in the air atmosphere for 2 hours at 1200 °C. Crystal structure prediction has been performed using Bond ValenceCalculation (BVC) method.Moreover, theoretical stability of theperovskite structure for synthesized and calculated Fe/Pb/Zr-codoped barium titanatecompounds has been investigated using the Goldschmidttolerance factor (Gt) and global instability index (GII).It was observed that magnetization of the system decreased after the sintering, with the most dramatic drop of 90.11% belonging to the sample activated for 150 min. In comparison with initial powders, X-ray powder diffractiondata confirmed the presence of newphases of BaFe12O19 and Ba1.696Ti0.228O3 in sintered samples. Utilizing the field emission scanning electron microscopy (FESEM), it was found that with the increase of activation time the morphology of the samples progressed from irregural, spherical grains to mostly rod-like ones. Energy dispersive X-ray (EDX) analysis identified the presence of Pb and Zr occupying the same locations on the surface of sintered samples, whilst Fe was uniformly deployed regardless of the activation time.",
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 = "Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_dais_11898"
}
Stojanović, N., Zagorac, D., Butulija, S., Lojpur, V., Kalezić-Glišović, A., Obradović, N.,& Maričić, A.. (2021). Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment. 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., 77-77.
https://hdl.handle.net/21.15107/rcub_dais_11898
Stojanović N, Zagorac D, Butulija S, Lojpur V, Kalezić-Glišović A, Obradović N, Maričić A. Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment. 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;:77-77.
https://hdl.handle.net/21.15107/rcub_dais_11898 .
Stojanović, Nemanja, Zagorac, Dejan, Butulija, Svetlana, Lojpur, Vesna, Kalezić-Glišović, Aleksandra, Obradović, Nina, Maričić, Aleksa, "Structural And Functional Investigation Of Fe/Pb/Zr-co-doped Barium Titanate Ceramics: From Theory To The Experiment" 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):77-77,
https://hdl.handle.net/21.15107/rcub_dais_11898 .

Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction

Filipović, Suzana; Obradović, Nina; Anđelković, Ljubica; Olćan, Dragan; Petrović, Jovana; Mirković, Miljana; Pavlović, Vladimir B.; Jeremić, Dejan; Vlahović, Branislav; Đorđević, Antonije

(Belgrade : International Institute for the Science of Sintering, 2021)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Anđelković, Ljubica
AU  - Olćan, Dragan
AU  - Petrović, Jovana
AU  - Mirković, Miljana
AU  - Pavlović, Vladimir B.
AU  - Jeremić, Dejan
AU  - Vlahović, Branislav
AU  - Đorđević, Antonije
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11230
AB  - Solid-state reaction between BaTiO3 and Fe2O3 was used to produce a multiferroic heterostructure composite. Commercial BaTiO3 and Fe(NO3)3•9H2O were suspended in ethanol for 30 minutes in an ultrasound bath. The prepared mixture was thermally processed at 300 oC for 6 h. Sintering at 1300 oC for 1 h resulted in a mixture of different phases, BaTiO3, BaFe12O19 and Ba12Ti28Fe15O84, which were confirmed by x-ray powder diffraction. A dense microstructure with a small volume fraction of closed porosity was indicated by the scanning electron microscopy, while a homogeneous distribution of Fe ions over BaTiO3 phase was visible from energy dispersive spectroscopy mapping. Doping of BaTiO3 with Fe2O3 resulted in formation of magnetic hexaferrite phases, as confirmed by dielectric measurements that showed a broadened maximum of the permittivity measured as a function of temperature.
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction
SP  - 1
EP  - 8
VL  - 53
DO  - 10.2298/SOS2101001F
UR  - https://hdl.handle.net/21.15107/rcub_dais_11230
ER  - 
@article{
author = "Filipović, Suzana and Obradović, Nina and Anđelković, Ljubica and Olćan, Dragan and Petrović, Jovana and Mirković, Miljana and Pavlović, Vladimir B. and Jeremić, Dejan and Vlahović, Branislav and Đorđević, Antonije",
year = "2021",
abstract = "Solid-state reaction between BaTiO3 and Fe2O3 was used to produce a multiferroic heterostructure composite. Commercial BaTiO3 and Fe(NO3)3•9H2O were suspended in ethanol for 30 minutes in an ultrasound bath. The prepared mixture was thermally processed at 300 oC for 6 h. Sintering at 1300 oC for 1 h resulted in a mixture of different phases, BaTiO3, BaFe12O19 and Ba12Ti28Fe15O84, which were confirmed by x-ray powder diffraction. A dense microstructure with a small volume fraction of closed porosity was indicated by the scanning electron microscopy, while a homogeneous distribution of Fe ions over BaTiO3 phase was visible from energy dispersive spectroscopy mapping. Doping of BaTiO3 with Fe2O3 resulted in formation of magnetic hexaferrite phases, as confirmed by dielectric measurements that showed a broadened maximum of the permittivity measured as a function of temperature.",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction",
pages = "1-8",
volume = "53",
doi = "10.2298/SOS2101001F",
url = "https://hdl.handle.net/21.15107/rcub_dais_11230"
}
Filipović, S., Obradović, N., Anđelković, L., Olćan, D., Petrović, J., Mirković, M., Pavlović, V. B., Jeremić, D., Vlahović, B.,& Đorđević, A.. (2021). Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 53, 1-8.
https://doi.org/10.2298/SOS2101001F
https://hdl.handle.net/21.15107/rcub_dais_11230
Filipović S, Obradović N, Anđelković L, Olćan D, Petrović J, Mirković M, Pavlović VB, Jeremić D, Vlahović B, Đorđević A. Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction. in Science of Sintering. 2021;53:1-8.
doi:10.2298/SOS2101001F
https://hdl.handle.net/21.15107/rcub_dais_11230 .
Filipović, Suzana, Obradović, Nina, Anđelković, Ljubica, Olćan, Dragan, Petrović, Jovana, Mirković, Miljana, Pavlović, Vladimir B., Jeremić, Dejan, Vlahović, Branislav, Đorđević, Antonije, "Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction" in Science of Sintering, 53 (2021):1-8,
https://doi.org/10.2298/SOS2101001F .,
https://hdl.handle.net/21.15107/rcub_dais_11230 .
2
1
3

Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions

Obradović, Nina; Fahrenholtz, William G.; Corlett, Cole; Filipović, Suzana; Nikolić, Marko; Marinković, Bojan A.; Failla, Simone; Sciti, Diletta; Di Rosa, Daniele; Sani, Elisa

(Basel : MDPI AG, 2021)

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Corlett, Cole
AU  - Filipović, Suzana
AU  - Nikolić, Marko
AU  - Marinković, Bojan A.
AU  - Failla, Simone
AU  - Sciti, Diletta
AU  - Di Rosa, Daniele
AU  - Sani, Elisa
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12431
AB  - Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by a solid-state reaction between MgO and α-Al2O3 powders. Mechanical activation for 30 min in a planetary ball mill was used to increase the reactivity of powders. Yttrium oxide and graphene were added to prevent abnormal grain growth during sintering. Samples were sintered by hot pressing under vacuum at 1450 °C. Phase composition and microstructure of sintered specimens were characterized by X-ray powder diffraction and scanning electron microscopy. Rietveld analysis revealed 100% pure spinel phase in all sintered specimens, and a decrease in crystallite size with the addition of yttria or graphene. Density measurements indicated that the mechanically activated specimen reached 99.6% relative density. Furthermore, the highest solar absorbance and highest spectral selectivity as a function of temperature were detected for the mechanically activated specimen with graphene addition. Mechanical activation is an efficient method to improve densification of MgAl2O4 prepared from mixed oxide powders, while additives improve microstructure and optical properties.
PB  - Basel : MDPI AG
T2  - Materials
T1  - Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions
SP  - 7674
VL  - 14
IS  - 24
DO  - 10.3390/ma14247674
UR  - https://hdl.handle.net/21.15107/rcub_dais_12431
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Corlett, Cole and Filipović, Suzana and Nikolić, Marko and Marinković, Bojan A. and Failla, Simone and Sciti, Diletta and Di Rosa, Daniele and Sani, Elisa",
year = "2021",
abstract = "Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by a solid-state reaction between MgO and α-Al2O3 powders. Mechanical activation for 30 min in a planetary ball mill was used to increase the reactivity of powders. Yttrium oxide and graphene were added to prevent abnormal grain growth during sintering. Samples were sintered by hot pressing under vacuum at 1450 °C. Phase composition and microstructure of sintered specimens were characterized by X-ray powder diffraction and scanning electron microscopy. Rietveld analysis revealed 100% pure spinel phase in all sintered specimens, and a decrease in crystallite size with the addition of yttria or graphene. Density measurements indicated that the mechanically activated specimen reached 99.6% relative density. Furthermore, the highest solar absorbance and highest spectral selectivity as a function of temperature were detected for the mechanically activated specimen with graphene addition. Mechanical activation is an efficient method to improve densification of MgAl2O4 prepared from mixed oxide powders, while additives improve microstructure and optical properties.",
publisher = "Basel : MDPI AG",
journal = "Materials",
title = "Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions",
pages = "7674",
volume = "14",
number = "24",
doi = "10.3390/ma14247674",
url = "https://hdl.handle.net/21.15107/rcub_dais_12431"
}
Obradović, N., Fahrenholtz, W. G., Corlett, C., Filipović, S., Nikolić, M., Marinković, B. A., Failla, S., Sciti, D., Di Rosa, D.,& Sani, E.. (2021). Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions. in Materials
Basel : MDPI AG., 14(24), 7674.
https://doi.org/10.3390/ma14247674
https://hdl.handle.net/21.15107/rcub_dais_12431
Obradović N, Fahrenholtz WG, Corlett C, Filipović S, Nikolić M, Marinković BA, Failla S, Sciti D, Di Rosa D, Sani E. Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions. in Materials. 2021;14(24):7674.
doi:10.3390/ma14247674
https://hdl.handle.net/21.15107/rcub_dais_12431 .
Obradović, Nina, Fahrenholtz, William G., Corlett, Cole, Filipović, Suzana, Nikolić, Marko, Marinković, Bojan A., Failla, Simone, Sciti, Diletta, Di Rosa, Daniele, Sani, Elisa, "Microstructural and Optical Properties of MgAl2O4 Spinel: Effects of Mechanical Activation, Y2O3 and Graphene Additions" in Materials, 14, no. 24 (2021):7674,
https://doi.org/10.3390/ma14247674 .,
https://hdl.handle.net/21.15107/rcub_dais_12431 .
3

Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG

Obradović, Nina; Filipović, Suzana; Rosenschon, Martin; Füglein, Ekkehard

(Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC), 2021)

TY  - CONF
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Rosenschon, Martin
AU  - Füglein, Ekkehard
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12353
AB  - Ceramic/polymer dielectric composites are widely used as components for electric devices, mainly because of their high chemical stability, mechanical strength, and flexibility. In order to increase dielectric permittivity, ceramic fillers with high dielectric constant have been usually incorporated in the polymer matrix in large amounts. With the aim to enhance dielectric properties of matrix, 5 wt.% of BaTiO3/Fe2O3 core/shell composite was added into the PVDF matrix. Prior to addition, five BaTiO3/Fe2O3 powders were prepared by different synthesis conditions. The changes in crystal structure and lattice dynamics of the obtained ceramic/polymer composite were correlated with changes in the phase composition and morphology of BaTiO3/Fe2O3 core/shell filler. Thermal analysis such as DTA/TG/DSC are useful methods to determine various parameters in ceramic/polymer composites. We were able to corroborate that differences in phase composition and morphology of BaTiO3/Fe2O3 core/shell filler have influence on formation of various PVDF allomorph modification, as well as a level of crystallinity.
PB  - Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)
C3  - Book of abstracts of the 6th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC6) and 15th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2021)
T1  - Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_dais_12353
ER  - 
@conference{
author = "Obradović, Nina and Filipović, Suzana and Rosenschon, Martin and Füglein, Ekkehard",
year = "2021",
abstract = "Ceramic/polymer dielectric composites are widely used as components for electric devices, mainly because of their high chemical stability, mechanical strength, and flexibility. In order to increase dielectric permittivity, ceramic fillers with high dielectric constant have been usually incorporated in the polymer matrix in large amounts. With the aim to enhance dielectric properties of matrix, 5 wt.% of BaTiO3/Fe2O3 core/shell composite was added into the PVDF matrix. Prior to addition, five BaTiO3/Fe2O3 powders were prepared by different synthesis conditions. The changes in crystal structure and lattice dynamics of the obtained ceramic/polymer composite were correlated with changes in the phase composition and morphology of BaTiO3/Fe2O3 core/shell filler. Thermal analysis such as DTA/TG/DSC are useful methods to determine various parameters in ceramic/polymer composites. We were able to corroborate that differences in phase composition and morphology of BaTiO3/Fe2O3 core/shell filler have influence on formation of various PVDF allomorph modification, as well as a level of crystallinity.",
publisher = "Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)",
journal = "Book of abstracts of the 6th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC6) and 15th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2021)",
title = "Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_dais_12353"
}
Obradović, N., Filipović, S., Rosenschon, M.,& Füglein, E.. (2021). Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG. in Book of abstracts of the 6th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC6) and 15th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2021)
Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)., 29-29.
https://hdl.handle.net/21.15107/rcub_dais_12353
Obradović N, Filipović S, Rosenschon M, Füglein E. Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG. in Book of abstracts of the 6th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC6) and 15th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2021). 2021;:29-29.
https://hdl.handle.net/21.15107/rcub_dais_12353 .
Obradović, Nina, Filipović, Suzana, Rosenschon, Martin, Füglein, Ekkehard, "Influence of BaTiO3/Fe2O3 addition on crystallization and polymorphism of PDVF polymer matrix followed by DSC-TG" in Book of abstracts of the 6th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC6) and 15th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2021) (2021):29-29,
https://hdl.handle.net/21.15107/rcub_dais_12353 .

Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM

Nedeljković, Borivoje; Pavlović, Vladimir B.; Obradović, Nina; Mitrović, Nebojša S.

(Belgrade : ETRAN, 2021)

TY  - CONF
AU  - Nedeljković, Borivoje
AU  - Pavlović, Vladimir B.
AU  - Obradović, Nina
AU  - Mitrović, Nebojša S.
PY  - 2021
UR  - https://www.etran.rs/2021/wp-content/uploads/2021/08/PROGRAM_ETRAN_2021_final_b5_za_web.pdf
UR  - https://dais.sanu.ac.rs/123456789/11922
AB  - U radu su ispitivani strukturna svojstva legure 49Fe49Co2V proizvedene PIM/MIM tehnologijom, tako što je polazni granulat pripremljen mešanjem FeCoV praha sa niskoviskoznim vezivom. Nakon brizganja sirovi uzorci su najpre tretirani rastvaračem a zatim i termički s istim ciljem odstranjivanja
veziva. MIM tehnologija je završena visokotemperaturskim sinterovanjem tokom 3,5 sata na temperaturama od 1370 °C do 1460 °C u atmosferi vodonika, kojim se obezbedjuju potrebne magnetne i mehaničke karakteristike. Strukturna svojstva veličine čestica Dmax, Feret X, Feret Y su ispitivana u zavisnosti od temperature sinterovanja.
PB  - Belgrade : ETRAN
C3  - Zbornik apstrakta i program 65. konferencije ETRAN i 8. konferencije IcETRAN, Etno selo Stanišići, Republika Srpska, 8-10. septembra 2021. godine = Proceedings of Abstracts and Program 8th Conference IcETRAN in conjunction with the 65th ETRAN Conference, Etno village Stanišići, Republic of Srpska, Bosnia and Herzegovina
T1  - Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM
SP  - 33
EP  - 33
UR  - https://hdl.handle.net/21.15107/rcub_dais_11922
ER  - 
@conference{
author = "Nedeljković, Borivoje and Pavlović, Vladimir B. and Obradović, Nina and Mitrović, Nebojša S.",
year = "2021",
abstract = "U radu su ispitivani strukturna svojstva legure 49Fe49Co2V proizvedene PIM/MIM tehnologijom, tako što je polazni granulat pripremljen mešanjem FeCoV praha sa niskoviskoznim vezivom. Nakon brizganja sirovi uzorci su najpre tretirani rastvaračem a zatim i termički s istim ciljem odstranjivanja
veziva. MIM tehnologija je završena visokotemperaturskim sinterovanjem tokom 3,5 sata na temperaturama od 1370 °C do 1460 °C u atmosferi vodonika, kojim se obezbedjuju potrebne magnetne i mehaničke karakteristike. Strukturna svojstva veličine čestica Dmax, Feret X, Feret Y su ispitivana u zavisnosti od temperature sinterovanja.",
publisher = "Belgrade : ETRAN",
journal = "Zbornik apstrakta i program 65. konferencije ETRAN i 8. konferencije IcETRAN, Etno selo Stanišići, Republika Srpska, 8-10. septembra 2021. godine = Proceedings of Abstracts and Program 8th Conference IcETRAN in conjunction with the 65th ETRAN Conference, Etno village Stanišići, Republic of Srpska, Bosnia and Herzegovina",
title = "Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM",
pages = "33-33",
url = "https://hdl.handle.net/21.15107/rcub_dais_11922"
}
Nedeljković, B., Pavlović, V. B., Obradović, N.,& Mitrović, N. S.. (2021). Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM. in Zbornik apstrakta i program 65. konferencije ETRAN i 8. konferencije IcETRAN, Etno selo Stanišići, Republika Srpska, 8-10. septembra 2021. godine = Proceedings of Abstracts and Program 8th Conference IcETRAN in conjunction with the 65th ETRAN Conference, Etno village Stanišići, Republic of Srpska, Bosnia and Herzegovina
Belgrade : ETRAN., 33-33.
https://hdl.handle.net/21.15107/rcub_dais_11922
Nedeljković B, Pavlović VB, Obradović N, Mitrović NS. Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM. in Zbornik apstrakta i program 65. konferencije ETRAN i 8. konferencije IcETRAN, Etno selo Stanišići, Republika Srpska, 8-10. septembra 2021. godine = Proceedings of Abstracts and Program 8th Conference IcETRAN in conjunction with the 65th ETRAN Conference, Etno village Stanišići, Republic of Srpska, Bosnia and Herzegovina. 2021;:33-33.
https://hdl.handle.net/21.15107/rcub_dais_11922 .
Nedeljković, Borivoje, Pavlović, Vladimir B., Obradović, Nina, Mitrović, Nebojša S., "Ispitivanje strukturnih svojstava legure FeCoV metodom skenirajuće elektronske mikroskopije - SEM" in Zbornik apstrakta i program 65. konferencije ETRAN i 8. konferencije IcETRAN, Etno selo Stanišići, Republika Srpska, 8-10. septembra 2021. godine = Proceedings of Abstracts and Program 8th Conference IcETRAN in conjunction with the 65th ETRAN Conference, Etno village Stanišići, Republic of Srpska, Bosnia and Herzegovina (2021):33-33,
https://hdl.handle.net/21.15107/rcub_dais_11922 .

Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition

Obradović, Nina; Fahrenholtz, William G.; Corlett, Cole; Filipović, Suzana; Nikolić, Marko G.; Marinković, Bojan A.; Failla, Simone; Sciti, Diletta; Sani, Elisa

(Belgrade : Serbian Ceramic Society, 2021)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Corlett, Cole
AU  - Filipović, Suzana
AU  - Nikolić, Marko G.
AU  - Marinković, Bojan A.
AU  - Failla, Simone
AU  - Sciti, Diletta
AU  - Sani, Elisa
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11895
AB  - Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by solid-state reaction between MgO and α-Al2O3 powders. Mechanical activation of 30 minutes in a planetary ball mill was used to increase the reactivity of powders. Yttrium oxide and graphene were added to prevent abnormal grain growth during sintering. Samples were sintered by hot-pressing under vacuum at 1450 °C. Phase composition and microstructure of sintered specimens were characterized by X-ray diffraction analysis and scanning electron microscopy. Rietveld analysis revealed 100 % pure spinel phase in all sintered specimens, and decrease in crystallite size with the addition of yttria or graphene. Density measurements indicated that the mechanically activated specimen reached 99.6 % relative density, while other specimens were above 96.5 % relative density. Furthermore, the highest solar absorbance and highest spectral selectivity as a function of temperature were detected for the mechanically activated specimen with graphene addition. Mechanical activation is an efficient method to improve the densification behaviour of MgAl2O4 produced from mixed oxide powders, while additives improve microstructure and optical properties.
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  - Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition
SP  - 92
EP  - 92
UR  - https://hdl.handle.net/21.15107/rcub_dais_11895
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Corlett, Cole and Filipović, Suzana and Nikolić, Marko G. and Marinković, Bojan A. and Failla, Simone and Sciti, Diletta and Sani, Elisa",
year = "2021",
abstract = "Magnesium aluminate and other alumina-based spinels attract attention due to their high hardness, high mechanical strength, and low dielectric constant. MgAl2O4 was produced by solid-state reaction between MgO and α-Al2O3 powders. Mechanical activation of 30 minutes in a planetary ball mill was used to increase the reactivity of powders. Yttrium oxide and graphene were added to prevent abnormal grain growth during sintering. Samples were sintered by hot-pressing under vacuum at 1450 °C. Phase composition and microstructure of sintered specimens were characterized by X-ray diffraction analysis and scanning electron microscopy. Rietveld analysis revealed 100 % pure spinel phase in all sintered specimens, and decrease in crystallite size with the addition of yttria or graphene. Density measurements indicated that the mechanically activated specimen reached 99.6 % relative density, while other specimens were above 96.5 % relative density. Furthermore, the highest solar absorbance and highest spectral selectivity as a function of temperature were detected for the mechanically activated specimen with graphene addition. Mechanical activation is an efficient method to improve the densification behaviour of MgAl2O4 produced from mixed oxide powders, while additives improve microstructure and optical properties.",
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 = "Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition",
pages = "92-92",
url = "https://hdl.handle.net/21.15107/rcub_dais_11895"
}
Obradović, N., Fahrenholtz, W. G., Corlett, C., Filipović, S., Nikolić, M. G., Marinković, B. A., Failla, S., Sciti, D.,& Sani, E.. (2021). Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition. 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., 92-92.
https://hdl.handle.net/21.15107/rcub_dais_11895
Obradović N, Fahrenholtz WG, Corlett C, Filipović S, Nikolić MG, Marinković BA, Failla S, Sciti D, Sani E. Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition. 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;:92-92.
https://hdl.handle.net/21.15107/rcub_dais_11895 .
Obradović, Nina, Fahrenholtz, William G., Corlett, Cole, Filipović, Suzana, Nikolić, Marko G., Marinković, Bojan A., Failla, Simone, Sciti, Diletta, Sani, Elisa, "Microstructural and optical properties of MgAl2O4 Spinel: Effect of Mechanical Activation, Yttrium and Graphene addition" 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):92-92,
https://hdl.handle.net/21.15107/rcub_dais_11895 .

Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3

Filipović, Suzana; Obradović, Nina; Rosenschon, M.; Füglein, E.; Dojčilović, Radovan; Đorđević, Antonije; Petrović, J.; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2021)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Rosenschon, M.
AU  - Füglein, E.
AU  - Dojčilović, Radovan
AU  - Đorđević, Antonije
AU  - Petrović, J.
AU  - Pavlović, Vladimir B.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11902
AB  - The increase in the utilization of ceramic/polymer composites as components for electric devices is mainly based on their high chemical stability, mechanical strength, and flexibility. The polymers usually have poor dielectric performances. In order to increase the dielectric permittivity, ceramic fillers with high dielectric constant have been used as active fillers, and usually in large amounts, which have a detrimental effect on the mechanical properties of the composite. With the aim to enhance the dielectric properties of the composite without loss of polymer’s flexibility, 5 wt.% of BaTiO3/Fe2O3 core/shell powders, prepared by different synthesis conditions, was added into the PVDF matrix. The effect of the phase composition and morphology of the starting BaTiO3/Fe2O3 core/shell filler on the crystal structure and lattice dynamics was investigated. Based on the results of the thermal analysis, TG/DSC, various parameters of ceramic/polymer composites were determined. We were able to corroborate that differences in the phase composition and morphology of BaTiO3/Fe2O3 core/shell filler have an influence on the formation of various PVDF allomorph modifications, as well as the level of crystallinity. The dielectric performances of the pure PVDF and polymer/ceramic composites were measured. An enhancement in the dielectric permittivity and decrease in the loss tangent were revealed.
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  - Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3
SP  - 58
EP  - 58
UR  - https://hdl.handle.net/21.15107/rcub_dais_11902
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Rosenschon, M. and Füglein, E. and Dojčilović, Radovan and Đorđević, Antonije and Petrović, J. and Pavlović, Vladimir B.",
year = "2021",
abstract = "The increase in the utilization of ceramic/polymer composites as components for electric devices is mainly based on their high chemical stability, mechanical strength, and flexibility. The polymers usually have poor dielectric performances. In order to increase the dielectric permittivity, ceramic fillers with high dielectric constant have been used as active fillers, and usually in large amounts, which have a detrimental effect on the mechanical properties of the composite. With the aim to enhance the dielectric properties of the composite without loss of polymer’s flexibility, 5 wt.% of BaTiO3/Fe2O3 core/shell powders, prepared by different synthesis conditions, was added into the PVDF matrix. The effect of the phase composition and morphology of the starting BaTiO3/Fe2O3 core/shell filler on the crystal structure and lattice dynamics was investigated. Based on the results of the thermal analysis, TG/DSC, various parameters of ceramic/polymer composites were determined. We were able to corroborate that differences in the phase composition and morphology of BaTiO3/Fe2O3 core/shell filler have an influence on the formation of various PVDF allomorph modifications, as well as the level of crystallinity. The dielectric performances of the pure PVDF and polymer/ceramic composites were measured. An enhancement in the dielectric permittivity and decrease in the loss tangent were revealed.",
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 = "Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3",
pages = "58-58",
url = "https://hdl.handle.net/21.15107/rcub_dais_11902"
}
Filipović, S., Obradović, N., Rosenschon, M., Füglein, E., Dojčilović, R., Đorđević, A., Petrović, J.,& Pavlović, V. B.. (2021). Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3. 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., 58-58.
https://hdl.handle.net/21.15107/rcub_dais_11902
Filipović S, Obradović N, Rosenschon M, Füglein E, Dojčilović R, Đorđević A, Petrović J, Pavlović VB. Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3. 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;:58-58.
https://hdl.handle.net/21.15107/rcub_dais_11902 .
Filipović, Suzana, Obradović, Nina, Rosenschon, M., Füglein, E., Dojčilović, Radovan, Đorđević, Antonije, Petrović, J., Pavlović, Vladimir B., "Enhanced dielectric properties of PVDF-based composites with BaTiO3 ceramic decorated with Fe2O3" 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):58-58,
https://hdl.handle.net/21.15107/rcub_dais_11902 .

Magnetic features of MnZn ferrite for electronic applications

Mitrović, Nebojša S.; Nedeljković, Borivoje; Obradović, Nina

(Belgrade : Serbian Ceramic Society, 2021)

TY  - CONF
AU  - Mitrović, Nebojša S.
AU  - Nedeljković, Borivoje
AU  - Obradović, Nina
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11901
AB  - MnZn ferrites are one of the most common soft magnetic materials for application in microelectronics as a material for microwave components (transformers, transducers, inductors, magnetic fluids, sensors,). MnZn ferrites attracted attention due to wide range of relative magnetic permeability values (from 103 to 104), high resistivity (consequently low magnetic losses) as well as high thermal stability (high saturation magnetic flux density at high temperatures (Bs > 0.4 T at 100 OC) and a relatively high Curie temperature of about 230 OC).Recently, a variety of technologies have been examined for MnZn ferrite production: powder/ceramic injection moulding (PIM/CIM), chemical co-precipitation method, conventional ceramic processing, sol-gel or microemulsion. In this study a toroidal samples of MnZn ferrites with dimensions appropriate for applications in electronic industry (i.e. microelectronics: inner diameter 3.5 mm, outer diameter 7 mm, height 2 mm) were investigated. Magnetic properties were measured by hysteresis graph (B-H curve at level of magnetic excitation up to 1 kA/m and at different frequencies from 5 Hz to 10 kHz). Relative magnetic permeability as well as magnetic power (active) losses was analyzed as frequency dependent. Very stable maximum magnetic permeability was observed for magnetic field of 200 A/m in the frequency range from 50 Hz (μr ≈ 480) to 10 kHz (μr ≈ 450). Active power referred to unit mass of about 30 W/kg was recorded at frequency of 1 kHz (@ 280 mT). As the hysteresis losses are proportionally to the frequency (~ f) and eddy-current losses are proportionally to the square of frequency (~ f2) it was performed separation between these two components from total magnetic power (active) losses. Numerical fitting of this functionality on frequency were performed and analysed. The results obtained were compared with the catalogue data for other MnZn ferrite components for applications in electronics.
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  - Magnetic features of MnZn ferrite for electronic applications
SP  - 59
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_dais_11901
ER  - 
@conference{
author = "Mitrović, Nebojša S. and Nedeljković, Borivoje and Obradović, Nina",
year = "2021",
abstract = "MnZn ferrites are one of the most common soft magnetic materials for application in microelectronics as a material for microwave components (transformers, transducers, inductors, magnetic fluids, sensors,). MnZn ferrites attracted attention due to wide range of relative magnetic permeability values (from 103 to 104), high resistivity (consequently low magnetic losses) as well as high thermal stability (high saturation magnetic flux density at high temperatures (Bs > 0.4 T at 100 OC) and a relatively high Curie temperature of about 230 OC).Recently, a variety of technologies have been examined for MnZn ferrite production: powder/ceramic injection moulding (PIM/CIM), chemical co-precipitation method, conventional ceramic processing, sol-gel or microemulsion. In this study a toroidal samples of MnZn ferrites with dimensions appropriate for applications in electronic industry (i.e. microelectronics: inner diameter 3.5 mm, outer diameter 7 mm, height 2 mm) were investigated. Magnetic properties were measured by hysteresis graph (B-H curve at level of magnetic excitation up to 1 kA/m and at different frequencies from 5 Hz to 10 kHz). Relative magnetic permeability as well as magnetic power (active) losses was analyzed as frequency dependent. Very stable maximum magnetic permeability was observed for magnetic field of 200 A/m in the frequency range from 50 Hz (μr ≈ 480) to 10 kHz (μr ≈ 450). Active power referred to unit mass of about 30 W/kg was recorded at frequency of 1 kHz (@ 280 mT). As the hysteresis losses are proportionally to the frequency (~ f) and eddy-current losses are proportionally to the square of frequency (~ f2) it was performed separation between these two components from total magnetic power (active) losses. Numerical fitting of this functionality on frequency were performed and analysed. The results obtained were compared with the catalogue data for other MnZn ferrite components for applications in electronics.",
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 = "Magnetic features of MnZn ferrite for electronic applications",
pages = "59-59",
url = "https://hdl.handle.net/21.15107/rcub_dais_11901"
}
Mitrović, N. S., Nedeljković, B.,& Obradović, N.. (2021). Magnetic features of MnZn ferrite for electronic applications. 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., 59-59.
https://hdl.handle.net/21.15107/rcub_dais_11901
Mitrović NS, Nedeljković B, Obradović N. Magnetic features of MnZn ferrite for electronic applications. 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;:59-59.
https://hdl.handle.net/21.15107/rcub_dais_11901 .
Mitrović, Nebojša S., Nedeljković, Borivoje, Obradović, Nina, "Magnetic features of MnZn ferrite for electronic applications" 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):59-59,
https://hdl.handle.net/21.15107/rcub_dais_11901 .