TY  - CONF
AU  - Obradović, Nina
AU  - Đorđević, Antonije
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/6962
AB  - Mechanical activation is commonly used as a pre-sintering process in order to enhance the reactivity of materials, reduce the particle size, increase diffusion rates, accelerate the reaction, and lower the sintering temperature. The mechanical activation can affect the final electrical and mechanical characteristics. In this paper we consider the influence of the mechanical activation on the permittivity and the loss tangent. We outline methods for evaluation of these parameters, with emphasis on our coaxial-chamber technique for measurements in the VHF band.
PB  - Belgrade : ETRAN
PB  - Belgrade : Academic Mind
C3  - Proceedings of Papers – 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019, Silver Lake, Serbia, June 03 – 06, 2019 / Zbornik radova - 63. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 03 – 06. juna, 2019. godine
T1  - Influence of Mechanical Activation on Electrical Properties of Ceramic Materials in VHF Band
SP  - 636
EP  - 645
UR  - https://hdl.handle.net/21.15107/rcub_dais_6962
ER  - 

@conference{
author = "Obradović, Nina and Đorđević, Antonije",
year = "2019",
abstract = "Mechanical activation is commonly used as a pre-sintering process in order to enhance the reactivity of materials, reduce the particle size, increase diffusion rates, accelerate the reaction, and lower the sintering temperature. The mechanical activation can affect the final electrical and mechanical characteristics. In this paper we consider the influence of the mechanical activation on the permittivity and the loss tangent. We outline methods for evaluation of these parameters, with emphasis on our coaxial-chamber technique for measurements in the VHF band.",
publisher = "Belgrade : ETRAN, Belgrade : Academic Mind",
journal = "Proceedings of Papers – 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019, Silver Lake, Serbia, June 03 – 06, 2019 / Zbornik radova - 63. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 03 – 06. juna, 2019. godine",
title = "Influence of Mechanical Activation on Electrical Properties of Ceramic Materials in VHF Band",
pages = "636-645",
url = "https://hdl.handle.net/21.15107/rcub_dais_6962"
}

Obradović, N.,& Đorđević, A.. (2019). Influence of Mechanical Activation on Electrical Properties of Ceramic Materials in VHF Band. in Proceedings of Papers – 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019, Silver Lake, Serbia, June 03 – 06, 2019 / Zbornik radova - 63. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 03 – 06. juna, 2019. godine
Belgrade : ETRAN., 636-645.
https://hdl.handle.net/21.15107/rcub_dais_6962

Obradović N, Đorđević A. Influence of Mechanical Activation on Electrical Properties of Ceramic Materials in VHF Band. in Proceedings of Papers – 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019, Silver Lake, Serbia, June 03 – 06, 2019 / Zbornik radova - 63. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 03 – 06. juna, 2019. godine. 2019;:636-645.
https://hdl.handle.net/21.15107/rcub_dais_6962 .

Obradović, Nina, Đorđević, Antonije, "Influence of Mechanical Activation on Electrical Properties of Ceramic Materials in VHF Band" in Proceedings of Papers – 6th International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2019, Silver Lake, Serbia, June 03 – 06, 2019 / Zbornik radova - 63. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 03 – 06. juna, 2019. godine (2019):636-645,
https://hdl.handle.net/21.15107/rcub_dais_6962 .

TY  - JOUR
AU  - Đorđević, Antonije
AU  - Olćan, Dragan
AU  - Obradović, Nina
AU  - Paunović, Vesna
AU  - Filipović, Suzana
AU  - Pavlović, Vladimir B.
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2369
AB  - Post-sintering of magnesium titanate ceramics by hot isostatic pressing (HIP) in an oxygen-free atmosphere significantly alters various electrical properties of the product. In particular, the sintered material becomes a semiconductor. The aims of this paper are: to extend our investigations of the electrical properties of this material by expanding the frequency range of measurements, to design interpolation formulas for the frequency dependence of the complex relative permittivity, and to propose HIP-sintered magnesium titanate as a material for thermistors that have a negative-temperature-coefficient resistance (NTCR), as well as for varistors.
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Electrical properties of magnesium titanate ceramics post-sintered by hot isostatic pressing
SP  - 373
EP  - 380
VL  - 49
IS  - 4
DO  - 10.2298/SOS1704373D
UR  - https://hdl.handle.net/21.15107/rcub_dais_2369
ER  - 

@article{
author = "Đorđević, Antonije and Olćan, Dragan and Obradović, Nina and Paunović, Vesna and Filipović, Suzana and Pavlović, Vladimir B.",
year = "2017",
abstract = "Post-sintering of magnesium titanate ceramics by hot isostatic pressing (HIP) in an oxygen-free atmosphere significantly alters various electrical properties of the product. In particular, the sintered material becomes a semiconductor. The aims of this paper are: to extend our investigations of the electrical properties of this material by expanding the frequency range of measurements, to design interpolation formulas for the frequency dependence of the complex relative permittivity, and to propose HIP-sintered magnesium titanate as a material for thermistors that have a negative-temperature-coefficient resistance (NTCR), as well as for varistors.",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Electrical properties of magnesium titanate ceramics post-sintered by hot isostatic pressing",
pages = "373-380",
volume = "49",
number = "4",
doi = "10.2298/SOS1704373D",
url = "https://hdl.handle.net/21.15107/rcub_dais_2369"
}

Đorđević, A., Olćan, D., Obradović, N., Paunović, V., Filipović, S.,& Pavlović, V. B.. (2017). Electrical properties of magnesium titanate ceramics post-sintered by hot isostatic pressing. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 49(4), 373-380.
https://doi.org/10.2298/SOS1704373D
https://hdl.handle.net/21.15107/rcub_dais_2369

Đorđević A, Olćan D, Obradović N, Paunović V, Filipović S, Pavlović VB. Electrical properties of magnesium titanate ceramics post-sintered by hot isostatic pressing. in Science of Sintering. 2017;49(4):373-380.
doi:10.2298/SOS1704373D
https://hdl.handle.net/21.15107/rcub_dais_2369 .

Đorđević, Antonije, Olćan, Dragan, Obradović, Nina, Paunović, Vesna, Filipović, Suzana, Pavlović, Vladimir B., "Electrical properties of magnesium titanate ceramics post-sintered by hot isostatic pressing" in Science of Sintering, 49, no. 4 (2017):373-380,
https://doi.org/10.2298/SOS1704373D .,
https://hdl.handle.net/21.15107/rcub_dais_2369 .

TY  - JOUR
AU  - Đorđević, Antonije
AU  - Dinkić, Jelena
AU  - Stevanović, Marija
AU  - Olćan, Dragan
AU  - Filipović, Suzana
AU  - Obradović, Nina
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/2319
AB  - We present two coaxial chambers for measurements of  the  complex  permittivity of solid  and  liquid  samples, in a frequency range that is in the transition between lower frequencies, here  parallel-plate capacitor techniques are used, and higher(microwave) frequencies, where antennas, open coaxial  lines, and  waveguide s  are  employed.  Using  a  network  analyzer,  we  measure  the  reflection  coefficient  of  the chamber. From the obtained results, we extract the relative permittivity of the  measured  sample  using  a  quasistatic  or  a  dynamic  model  of  the chamber with the sample.
PB  - Belgrade : National Society for Microwave Technique, Technologies and Systems and Serbia and Montenegro IEEE MTT-S Chapter
T2  - Microwave Review
T1  - Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers
SP  - 3
EP  - 9
VL  - 22
IS  - 2
UR  - https://hdl.handle.net/21.15107/rcub_dais_2319
ER  - 

@article{
author = "Đorđević, Antonije and Dinkić, Jelena and Stevanović, Marija and Olćan, Dragan and Filipović, Suzana and Obradović, Nina",
year = "2016",
abstract = "We present two coaxial chambers for measurements of  the  complex  permittivity of solid  and  liquid  samples, in a frequency range that is in the transition between lower frequencies, here  parallel-plate capacitor techniques are used, and higher(microwave) frequencies, where antennas, open coaxial  lines, and  waveguide s  are  employed.  Using  a  network  analyzer,  we  measure  the  reflection  coefficient  of  the chamber. From the obtained results, we extract the relative permittivity of the  measured  sample  using  a  quasistatic  or  a  dynamic  model  of  the chamber with the sample.",
publisher = "Belgrade : National Society for Microwave Technique, Technologies and Systems and Serbia and Montenegro IEEE MTT-S Chapter",
journal = "Microwave Review",
title = "Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers",
pages = "3-9",
volume = "22",
number = "2",
url = "https://hdl.handle.net/21.15107/rcub_dais_2319"
}

Đorđević, A., Dinkić, J., Stevanović, M., Olćan, D., Filipović, S.,& Obradović, N.. (2016). Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers. in Microwave Review
Belgrade : National Society for Microwave Technique, Technologies and Systems and Serbia and Montenegro IEEE MTT-S Chapter., 22(2), 3-9.
https://hdl.handle.net/21.15107/rcub_dais_2319

Đorđević A, Dinkić J, Stevanović M, Olćan D, Filipović S, Obradović N. Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers. in Microwave Review. 2016;22(2):3-9.
https://hdl.handle.net/21.15107/rcub_dais_2319 .

Đorđević, Antonije, Dinkić, Jelena, Stevanović, Marija, Olćan, Dragan, Filipović, Suzana, Obradović, Nina, "Measurement of Permittivity of Solid and Liquid Dielectrics in Coaxial Chambers" in Microwave Review, 22, no. 2 (2016):3-9,
https://hdl.handle.net/21.15107/rcub_dais_2319 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Pavlović, Vladimir B.
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
AU  - Kachlik, Martin
AU  - Maca, Karel
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/2314
AB  - Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The mixtures of MgO-Al2O3-SiO2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of time of mechanical treatment.
T2  - Science of Sintering
T1  - Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique
SP  - 157
EP  - 165
VL  - 48
IS  - 2
DO  - 10.2298/SOS1602157O
UR  - https://hdl.handle.net/21.15107/rcub_dais_2314
ER  - 

@article{
author = "Obradović, Nina and Filipović, Suzana and Đorđević, Nataša and Kosanović, Darko and Pavlović, Vladimir B. and Olćan, Dragan and Đorđević, Antonije and Kachlik, Martin and Maca, Karel",
year = "2016",
abstract = "Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The mixtures of MgO-Al2O3-SiO2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of time of mechanical treatment.",
journal = "Science of Sintering",
title = "Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique",
pages = "157-165",
volume = "48",
number = "2",
doi = "10.2298/SOS1602157O",
url = "https://hdl.handle.net/21.15107/rcub_dais_2314"
}

Obradović, N., Filipović, S., Đorđević, N., Kosanović, D., Pavlović, V. B., Olćan, D., Đorđević, A., Kachlik, M.,& Maca, K.. (2016). Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique. in Science of Sintering, 48(2), 157-165.
https://doi.org/10.2298/SOS1602157O
https://hdl.handle.net/21.15107/rcub_dais_2314

Obradović N, Filipović S, Đorđević N, Kosanović D, Pavlović VB, Olćan D, Đorđević A, Kachlik M, Maca K. Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique. in Science of Sintering. 2016;48(2):157-165.
doi:10.2298/SOS1602157O
https://hdl.handle.net/21.15107/rcub_dais_2314 .

Obradović, Nina, Filipović, Suzana, Đorđević, Nataša, Kosanović, Darko, Pavlović, Vladimir B., Olćan, Dragan, Đorđević, Antonije, Kachlik, Martin, Maca, Karel, "Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique" in Science of Sintering, 48, no. 2 (2016):157-165,
https://doi.org/10.2298/SOS1602157O .,
https://hdl.handle.net/21.15107/rcub_dais_2314 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Đorđević, Nataša
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Pavlović, Vladimir B.
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
AU  - Kachlik, Martin
AU  - Maca, Karel
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15996
AB  - Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The mixtures of MgO-Al2O3-SiO2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of time of mechanical treatment.
PB  - Insternational Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique
SP  - 157
EP  - 165
VL  - 48
IS  - 2
DO  - 10.2298/SOS1602157O
UR  - https://hdl.handle.net/21.15107/rcub_dais_15996
ER  - 

@article{
author = "Obradović, Nina and Đorđević, Nataša and Filipović, Suzana and Kosanović, Darko and Pavlović, Vladimir B. and Olćan, Dragan and Đorđević, Antonije and Kachlik, Martin and Maca, Karel",
year = "2016",
abstract = "Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The mixtures of MgO-Al2O3-SiO2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of time of mechanical treatment.",
publisher = "Insternational Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique",
pages = "157-165",
volume = "48",
number = "2",
doi = "10.2298/SOS1602157O",
url = "https://hdl.handle.net/21.15107/rcub_dais_15996"
}

Obradović, N., Đorđević, N., Filipović, S., Kosanović, D., Pavlović, V. B., Olćan, D., Đorđević, A., Kachlik, M.,& Maca, K.. (2016). Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique. in Science of Sintering
Insternational Institute for the Science of Sintering., 48(2), 157-165.
https://doi.org/10.2298/SOS1602157O
https://hdl.handle.net/21.15107/rcub_dais_15996

Obradović N, Đorđević N, Filipović S, Kosanović D, Pavlović VB, Olćan D, Đorđević A, Kachlik M, Maca K. Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique. in Science of Sintering. 2016;48(2):157-165.
doi:10.2298/SOS1602157O
https://hdl.handle.net/21.15107/rcub_dais_15996 .

Obradović, Nina, Đorđević, Nataša, Filipović, Suzana, Kosanović, Darko, Pavlović, Vladimir B., Olćan, Dragan, Đorđević, Antonije, Kachlik, Martin, Maca, Karel, "Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique" in Science of Sintering, 48, no. 2 (2016):157-165,
https://doi.org/10.2298/SOS1602157O .,
https://hdl.handle.net/21.15107/rcub_dais_15996 .