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 .

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 .

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 .

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 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Pavlović, Vera P.
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
AU  - Tshantshapanyan, Ani
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/4557
AB  - Sintering of pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with the addition of 5 mass % TeO2 was studied. Green bodies were prepared from powder mixtures mechanically activated in a high-energy planetary mill, shaped by uniaxial (20 MPa) and cold isostatic pressing (1000 MPa). The pressure-less sintering of these specimens was performed at 1350°C for 1 h. High relative density over 95% of the theoretical value was obtained through solid-state reaction and pressure-less sintering of powder activated for 40 min, and for the first time reported in the literature. Phase composition and microstructures of sintered samples were determined by XRD and SEM, coupled with EDS mapping. The real part of the complex relative permittivity of the samples was measured at 200 MHz. The loss tangent of all samples was below the resolution of the measurement setup. A strong correlation between the relative permittivity and the density agrees with previously published data.
PB  - Taylor and Francis
T2  - Advances in Applied Ceramics
T1  - Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering
SP  - 241
EP  - 248
VL  - 118
IS  - 5
DO  - 10.1080/17436753.2018.1548150
UR  - https://hdl.handle.net/21.15107/rcub_dais_4557
ER  - 

@article{
author = "Obradović, Nina and Pavlović, Vera P. and Kachlik, Martin and Maca, Karel and Olćan, Dragan and Đorđević, Antonije and Tshantshapanyan, Ani and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2019",
abstract = "Sintering of pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with the addition of 5 mass % TeO2 was studied. Green bodies were prepared from powder mixtures mechanically activated in a high-energy planetary mill, shaped by uniaxial (20 MPa) and cold isostatic pressing (1000 MPa). The pressure-less sintering of these specimens was performed at 1350°C for 1 h. High relative density over 95% of the theoretical value was obtained through solid-state reaction and pressure-less sintering of powder activated for 40 min, and for the first time reported in the literature. Phase composition and microstructures of sintered samples were determined by XRD and SEM, coupled with EDS mapping. The real part of the complex relative permittivity of the samples was measured at 200 MHz. The loss tangent of all samples was below the resolution of the measurement setup. A strong correlation between the relative permittivity and the density agrees with previously published data.",
publisher = "Taylor and Francis",
journal = "Advances in Applied Ceramics",
title = "Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering",
pages = "241-248",
volume = "118",
number = "5",
doi = "10.1080/17436753.2018.1548150",
url = "https://hdl.handle.net/21.15107/rcub_dais_4557"
}

Obradović, N., Pavlović, V. P., Kachlik, M., Maca, K., Olćan, D., Đorđević, A., Tshantshapanyan, A., Vlahović, B.,& Pavlović, V. B.. (2019). Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering. in Advances in Applied Ceramics
Taylor and Francis., 118(5), 241-248.
https://doi.org/10.1080/17436753.2018.1548150
https://hdl.handle.net/21.15107/rcub_dais_4557

Obradović N, Pavlović VP, Kachlik M, Maca K, Olćan D, Đorđević A, Tshantshapanyan A, Vlahović B, Pavlović VB. Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering. in Advances in Applied Ceramics. 2019;118(5):241-248.
doi:10.1080/17436753.2018.1548150
https://hdl.handle.net/21.15107/rcub_dais_4557 .

Obradović, Nina, Pavlović, Vera P., Kachlik, Martin, Maca, Karel, Olćan, Dragan, Đorđević, Antonije, Tshantshapanyan, Ani, Vlahović, Branislav, Pavlović, Vladimir B., "Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering" in Advances in Applied Ceramics, 118, no. 5 (2019):241-248,
https://doi.org/10.1080/17436753.2018.1548150 .,
https://hdl.handle.net/21.15107/rcub_dais_4557 .

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  - Terzić, Anja
AU  - Obradović, Nina
AU  - Stojanović, Jovica
AU  - Pavlović, Vladimir B.
AU  - Andrić, Ljubiša
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2356
AB  - The focus of the study was on providing insights into interconnections between sintering and development of the crystalline microstructure, and consequently variations in dielectric behavior of four steatites fabricated from a low-cost raw material, i.e. talc. The changes, induced by the alternations of the binders (bentonite, kaolin clay) and fluxing agents (BaCO3, feldspar), were monitored in the temperature range 1000° to 1250 °C in which complete densification and re-crystallization of the investigated structures were accomplished. The critical points in the synthesis of steatite materials were assessed by instrumental analyses. Crystallinity changes and mineral phase transition during sintering were monitored by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy accompanied with EDS mapping. The thermal stability was observed on the green mixtures using differential thermal and thermo gravimetric analyses. Electrical measurements recorded variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the sintering temperature. The investigation highlighted critical design points, as well as the optimal combinations of the raw materials for production of the steatite ceramics for advanced electrical engineering applications.
PB  - Elsevier
T2  - Ceramics International
T1  - Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials
SP  - 13264
EP  - 13275
VL  - 43
IS  - 16
DO  - 10.1016/j.ceramint.2017.07.024
UR  - https://hdl.handle.net/21.15107/rcub_dais_2356
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Stojanović, Jovica and Pavlović, Vladimir B. and Andrić, Ljubiša and Olćan, Dragan and Đorđević, Antonije",
year = "2017",
abstract = "The focus of the study was on providing insights into interconnections between sintering and development of the crystalline microstructure, and consequently variations in dielectric behavior of four steatites fabricated from a low-cost raw material, i.e. talc. The changes, induced by the alternations of the binders (bentonite, kaolin clay) and fluxing agents (BaCO3, feldspar), were monitored in the temperature range 1000° to 1250 °C in which complete densification and re-crystallization of the investigated structures were accomplished. The critical points in the synthesis of steatite materials were assessed by instrumental analyses. Crystallinity changes and mineral phase transition during sintering were monitored by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy accompanied with EDS mapping. The thermal stability was observed on the green mixtures using differential thermal and thermo gravimetric analyses. Electrical measurements recorded variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the sintering temperature. The investigation highlighted critical design points, as well as the optimal combinations of the raw materials for production of the steatite ceramics for advanced electrical engineering applications.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials",
pages = "13264-13275",
volume = "43",
number = "16",
doi = "10.1016/j.ceramint.2017.07.024",
url = "https://hdl.handle.net/21.15107/rcub_dais_2356"
}

Terzić, A., Obradović, N., Stojanović, J., Pavlović, V. B., Andrić, L., Olćan, D.,& Đorđević, A.. (2017). Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials. in Ceramics International
Elsevier., 43(16), 13264-13275.
https://doi.org/10.1016/j.ceramint.2017.07.024
https://hdl.handle.net/21.15107/rcub_dais_2356

Terzić A, Obradović N, Stojanović J, Pavlović VB, Andrić L, Olćan D, Đorđević A. Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials. in Ceramics International. 2017;43(16):13264-13275.
doi:10.1016/j.ceramint.2017.07.024
https://hdl.handle.net/21.15107/rcub_dais_2356 .

Terzić, Anja, Obradović, Nina, Stojanović, Jovica, Pavlović, Vladimir B., Andrić, Ljubiša, Olćan, Dragan, Đorđević, Antonije, "Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials" in Ceramics International, 43, no. 16 (2017):13264-13275,
https://doi.org/10.1016/j.ceramint.2017.07.024 .,
https://hdl.handle.net/21.15107/rcub_dais_2356 .

TY  - CONF
AU  - Obradović, Nina
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Filipović, Suzana
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/15444
AB  - In this study, sintering of two systems was investigated in parallel, pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with addition of 5 mass % TeO2. Green bodies were prepared from powder mixtures mechanically activated for 0, 10 and 40minutes by uniaxial pressing at 20 MPa followed by cold isostatic pressing (CIP) at 1000 MPa. The pressure-less sintering of these specimens was performed at a temperature of 1350 oC for 1 h, with 10 oC/min heating rate. Densities over 96 % of theoretical values were obtained for samples activated for 40 minutes. XRD measurements of MAS-40 sintered sample pointed at a mixture that consisted of several phases, majority of cordierite (> 73 %), spinel MgAl2O4 (> 22 %), ZrSiO4 (2.5 %), and Al2O3 (1.8%), while XRD pattern of MAS-40-TeO2 contained majority of cordierite (> 72 %), spinel MgAl2O4 (> 23 %), ZrSiO4 (1.9 %), and Al2O3 (1.9 %). The relative permittivities of the samples were measured in an open test fixture. The results for the real part of the complex relative permittivity of the samples, measured at 200 MHz, are shown in Table I. The loss tangent for all samples was very small, below the resolution of the measurement setup (0.005).
There is a strong correlation between the relative permittivity and the density, which agrees with our previous results.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017
T1  - Characterization of pressure-less sintered MgO-Al2O3-SiO2-TeO2 system
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_dais_15444
ER  - 

@conference{
author = "Obradović, Nina and Đorđević, Nataša and Kosanović, Darko and Filipović, Suzana and Kachlik, Martin and Maca, Karel and Olćan, Dragan and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2017",
abstract = "In this study, sintering of two systems was investigated in parallel, pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with addition of 5 mass % TeO2. Green bodies were prepared from powder mixtures mechanically activated for 0, 10 and 40minutes by uniaxial pressing at 20 MPa followed by cold isostatic pressing (CIP) at 1000 MPa. The pressure-less sintering of these specimens was performed at a temperature of 1350 oC for 1 h, with 10 oC/min heating rate. Densities over 96 % of theoretical values were obtained for samples activated for 40 minutes. XRD measurements of MAS-40 sintered sample pointed at a mixture that consisted of several phases, majority of cordierite (> 73 %), spinel MgAl2O4 (> 22 %), ZrSiO4 (2.5 %), and Al2O3 (1.8%), while XRD pattern of MAS-40-TeO2 contained majority of cordierite (> 72 %), spinel MgAl2O4 (> 23 %), ZrSiO4 (1.9 %), and Al2O3 (1.9 %). The relative permittivities of the samples were measured in an open test fixture. The results for the real part of the complex relative permittivity of the samples, measured at 200 MHz, are shown in Table I. The loss tangent for all samples was very small, below the resolution of the measurement setup (0.005).
There is a strong correlation between the relative permittivity and the density, which agrees with our previous results.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017",
title = "Characterization of pressure-less sintered MgO-Al2O3-SiO2-TeO2 system",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_dais_15444"
}

Obradović, N., Đorđević, N., Kosanović, D., Filipović, S., Kachlik, M., Maca, K., Olćan, D., Đorđević, A.,& Pavlović, V. B.. (2017). Characterization of pressure-less sintered MgO-Al2O3-SiO2-TeO2 system. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017
Belgrade : Materials Research Society of Serbia., 70-70.
https://hdl.handle.net/21.15107/rcub_dais_15444

Obradović N, Đorđević N, Kosanović D, Filipović S, Kachlik M, Maca K, Olćan D, Đorđević A, Pavlović VB. Characterization of pressure-less sintered MgO-Al2O3-SiO2-TeO2 system. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017. 2017;:70-70.
https://hdl.handle.net/21.15107/rcub_dais_15444 .

Obradović, Nina, Đorđević, Nataša, Kosanović, Darko, Filipović, Suzana, Kachlik, Martin, Maca, Karel, Olćan, Dragan, Đorđević, Antonije, Pavlović, Vladimir B., "Characterization of pressure-less sintered MgO-Al2O3-SiO2-TeO2 system" in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017 (2017):70-70,
https://hdl.handle.net/21.15107/rcub_dais_15444 .

TY  - CONF
AU  - Olćan, Dragan
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Terzić, Anja
AU  - Pavlović, Vladimir B.
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Đorđević, Antonije
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/4824
AB  - We present an overview of electromagnetic numerical techniques and measurement apparatus that have been used for assessing electrical properties of ceramic samples. The complex permittivity of the ceramics is typically the first electromagnetic property of interest. In the measurement approach that we use, ceramic samples, in the shape of pills with metalized faces, are placed in either a proprietary coaxial chamber or in an open fixture. The scattering parameter (reflection coefficient) is measured using a network analyzer. For the deembedding of the complex permittivity of a sample one needs precise electromagnetic simulations, including detailed models of the chamber or the open fixture. For lower and intermediate frequencies we use a numerical technique for electrostatic analysis, based on the method of moments with Galerkin testing. We create a database that is used afterwards for evaluation of the complex permittivity practically in real time. For higher frequencies, a full electrodynamic model of the chamber is developed with WIPL-D software. For all our deembedding techniques, we have also developed a detailed model of losses in the SMA coaxial connectors, which is essential for a precise evaluation of the imaginary part of the complex permittivity for low-loss dielectrics. We present results of several measurements in order to illustrate the used techniques.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017
T1  - Assessing electrical properties of ceramic samples
SP  - 51
EP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_dais_4824
ER  - 

@conference{
author = "Olćan, Dragan and Obradović, Nina and Filipović, Suzana and Terzić, Anja and Pavlović, Vladimir B. and Kachlik, Martin and Maca, Karel and Đorđević, Antonije",
year = "2017",
abstract = "We present an overview of electromagnetic numerical techniques and measurement apparatus that have been used for assessing electrical properties of ceramic samples. The complex permittivity of the ceramics is typically the first electromagnetic property of interest. In the measurement approach that we use, ceramic samples, in the shape of pills with metalized faces, are placed in either a proprietary coaxial chamber or in an open fixture. The scattering parameter (reflection coefficient) is measured using a network analyzer. For the deembedding of the complex permittivity of a sample one needs precise electromagnetic simulations, including detailed models of the chamber or the open fixture. For lower and intermediate frequencies we use a numerical technique for electrostatic analysis, based on the method of moments with Galerkin testing. We create a database that is used afterwards for evaluation of the complex permittivity practically in real time. For higher frequencies, a full electrodynamic model of the chamber is developed with WIPL-D software. For all our deembedding techniques, we have also developed a detailed model of losses in the SMA coaxial connectors, which is essential for a precise evaluation of the imaginary part of the complex permittivity for low-loss dielectrics. We present results of several measurements in order to illustrate the used techniques.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017",
title = "Assessing electrical properties of ceramic samples",
pages = "51-52",
url = "https://hdl.handle.net/21.15107/rcub_dais_4824"
}

Olćan, D., Obradović, N., Filipović, S., Terzić, A., Pavlović, V. B., Kachlik, M., Maca, K.,& Đorđević, A.. (2017). Assessing electrical properties of ceramic samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017
Belgrade : Serbian Ceramic Society., 51-52.
https://hdl.handle.net/21.15107/rcub_dais_4824

Olćan D, Obradović N, Filipović S, Terzić A, Pavlović VB, Kachlik M, Maca K, Đorđević A. Assessing electrical properties of ceramic samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017. 2017;:51-52.
https://hdl.handle.net/21.15107/rcub_dais_4824 .

Olćan, Dragan, Obradović, Nina, Filipović, Suzana, Terzić, Anja, Pavlović, Vladimir B., Kachlik, Martin, Maca, Karel, Đorđević, Antonije, "Assessing electrical properties of ceramic samples" in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017 (2017):51-52,
https://hdl.handle.net/21.15107/rcub_dais_4824 .

TY  - CONF
AU  - Ђорђевић, Антоније
AU  - Динкић, Јелена
AU  - Стевановић, Марија
AU  - Олћан, Драган
AU  - Филиповић, Сузана
AU  - Обрадовић, Нина
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/15516
AB  - У раду су приказане коаксијалне коморе за мерење релативне комплексне пермитивности чврстих и течних узорака у опсегу учестaности који је на прелазу између нижих учестаности, за које се стандардно користи метод плочастог кондензатора, и високих (микроталасних) учестаности, за које се користе мерни системи са антенама, отвореним коаксијалним водовима или таласоводима. Анализатором мрежа мери се коефицијент рефлексије коморе. Из тих резултата, пермитивност узорка се одређује помоћу квазистатичког или динамичког модела коморе са узорком.
PB  - Београд : ЕТРАН
C3  - Зборник апстраката и програм 60. конференције ЕТРАН-а, Златибор, 13–16 јун 2016. године
T1  - Мерење пермитивности чврстих и течних диелектрика у коаксијалним коморама
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_dais_15516
ER  - 

@conference{
author = "Ђорђевић, Антоније and Динкић, Јелена and Стевановић, Марија and Олћан, Драган and Филиповић, Сузана and Обрадовић, Нина",
year = "2016",
abstract = "У раду су приказане коаксијалне коморе за мерење релативне комплексне пермитивности чврстих и течних узорака у опсегу учестaности који је на прелазу између нижих учестаности, за које се стандардно користи метод плочастог кондензатора, и високих (микроталасних) учестаности, за које се користе мерни системи са антенама, отвореним коаксијалним водовима или таласоводима. Анализатором мрежа мери се коефицијент рефлексије коморе. Из тих резултата, пермитивност узорка се одређује помоћу квазистатичког или динамичког модела коморе са узорком.",
publisher = "Београд : ЕТРАН",
journal = "Зборник апстраката и програм 60. конференције ЕТРАН-а, Златибор, 13–16 јун 2016. године",
title = "Мерење пермитивности чврстих и течних диелектрика у коаксијалним коморама",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_dais_15516"
}

Ђорђевић, А., Динкић, Ј., Стевановић, М., Олћан, Д., Филиповић, С.,& Обрадовић, Н.. (2016). Мерење пермитивности чврстих и течних диелектрика у коаксијалним коморама. in Зборник апстраката и програм 60. конференције ЕТРАН-а, Златибор, 13–16 јун 2016. године
Београд : ЕТРАН., 29-29.
https://hdl.handle.net/21.15107/rcub_dais_15516

Ђорђевић А, Динкић Ј, Стевановић М, Олћан Д, Филиповић С, Обрадовић Н. Мерење пермитивности чврстих и течних диелектрика у коаксијалним коморама. in Зборник апстраката и програм 60. конференције ЕТРАН-а, Златибор, 13–16 јун 2016. године. 2016;:29-29.
https://hdl.handle.net/21.15107/rcub_dais_15516 .

Ђорђевић, Антоније, Динкић, Јелена, Стевановић, Марија, Олћан, Драган, Филиповић, Сузана, Обрадовић, Нина, "Мерење пермитивности чврстих и течних диелектрика у коаксијалним коморама" in Зборник апстраката и програм 60. конференције ЕТРАН-а, Златибор, 13–16 јун 2016. године (2016):29-29,
https://hdl.handle.net/21.15107/rcub_dais_15516 .

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 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Pavlović, Vladimir B.
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
AU  - Kachlik, Martin
AU  - Maca, Karel
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/2322
AB  - The mechanical activation can help reduce production costs and modify cordierite-based materials. In this study, the structure and electrical properties of the 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 time periods ranging from 0 to 160 min. Structural investigations were performed on the obtained powders. The effects of activation and a two-step sintering process on the microstructure and crystal structure were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thermal stability was analyzed using DTA. Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the time of mechanical treatment.
PB  - Elsevier
T2  - Ceramics International
T1  - Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics
SP  - 13909
EP  - 13918
VL  - 42
IS  - 12
DO  - 10.1016/j.ceramint.2016.05.201
UR  - https://hdl.handle.net/21.15107/rcub_dais_2322
ER  - 

@article{
author = "Obradović, Nina and Filipović, Suzana and Đorđević, Nataša and Kosanović, Darko and Marković, Smilja and Pavlović, Vladimir B. and Olćan, Dragan and Đorđević, Antonije and Kachlik, Martin and Maca, Karel",
year = "2016",
abstract = "The mechanical activation can help reduce production costs and modify cordierite-based materials. In this study, the structure and electrical properties of the 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 time periods ranging from 0 to 160 min. Structural investigations were performed on the obtained powders. The effects of activation and a two-step sintering process on the microstructure and crystal structure were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thermal stability was analyzed using DTA. Electrical measurements showed variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the time of mechanical treatment.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics",
pages = "13909-13918",
volume = "42",
number = "12",
doi = "10.1016/j.ceramint.2016.05.201",
url = "https://hdl.handle.net/21.15107/rcub_dais_2322"
}

Obradović, N., Filipović, S., Đorđević, N., Kosanović, D., Marković, S., Pavlović, V. B., Olćan, D., Đorđević, A., Kachlik, M.,& Maca, K.. (2016). Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics. in Ceramics International
Elsevier., 42(12), 13909-13918.
https://doi.org/10.1016/j.ceramint.2016.05.201
https://hdl.handle.net/21.15107/rcub_dais_2322

Obradović N, Filipović S, Đorđević N, Kosanović D, Marković S, Pavlović VB, Olćan D, Đorđević A, Kachlik M, Maca K. Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics. in Ceramics International. 2016;42(12):13909-13918.
doi:10.1016/j.ceramint.2016.05.201
https://hdl.handle.net/21.15107/rcub_dais_2322 .

Obradović, Nina, Filipović, Suzana, Đorđević, Nataša, Kosanović, Darko, Marković, Smilja, Pavlović, Vladimir B., Olćan, Dragan, Đorđević, Antonije, Kachlik, Martin, Maca, Karel, "Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics" in Ceramics International, 42, no. 12 (2016):13909-13918,
https://doi.org/10.1016/j.ceramint.2016.05.201 .,
https://hdl.handle.net/21.15107/rcub_dais_2322 .