TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Stojanović, Jovica
AU  - Đorđević, Antonije
AU  - Andrić, Ljubiša
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/519
AB  - Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources - talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 degrees C and holding period conducted at 1250 degrees C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics
EP  - 3022
IS  - 3
SP  - 3013
VL  - 45
DO  - 10.1016/j.ceramint.2018.10.120
UR  - conv_842
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Kosanović, Darko and Stojanović, Jovica and Đorđević, Antonije and Andrić, Ljubiša and Pavlović, Vladimir B.",
year = "2019",
abstract = "Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources - talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 degrees C and holding period conducted at 1250 degrees C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics",
pages = "3022-3013",
number = "3",
volume = "45",
doi = "10.1016/j.ceramint.2018.10.120",
url = "conv_842"
}

Terzić, A., Obradović, N., Kosanović, D., Stojanović, J., Đorđević, A., Andrić, L.,& Pavlović, V. B.. (2019). Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(3), 3013-3022.
https://doi.org/10.1016/j.ceramint.2018.10.120
conv_842

Terzić A, Obradović N, Kosanović D, Stojanović J, Đorđević A, Andrić L, Pavlović VB. Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International. 2019;45(3):3013-3022.
doi:10.1016/j.ceramint.2018.10.120
conv_842 .

Terzić, Anja, Obradović, Nina, Kosanović, Darko, Stojanović, Jovica, Đorđević, Antonije, Andrić, Ljubiša, Pavlović, Vladimir B., "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics" in Ceramics International, 45, no. 3 (2019):3013-3022,
https://doi.org/10.1016/j.ceramint.2018.10.120 .,
conv_842 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Blagojević, Vladimir
AU  - Filipović, Suzana
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Pavlović, Vladimir
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/501
AB  - Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100-1400 degrees C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 degrees C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.
PB  - Springer, Dordrecht
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Kinetics of thermally activated processes in cordierite-based ceramics
EP  - 2998
IS  - 5
SP  - 2989
VL  - 138
DO  - 10.1007/s10973-018-7924-1
UR  - https://hdl.handle.net/21.15107/rcub_dais_7048
UR  - conv_867
ER  - 

@article{
author = "Obradović, Nina and Blagojević, Vladimir and Filipović, Suzana and Đorđević, Nataša and Kosanović, Darko and Marković, Smilja and Kachlik, Martin and Maca, Karel and Pavlović, Vladimir",
year = "2019",
abstract = "Thermally activated processes in cordierite-based ceramics were investigated to determine the effect of the mechanical activation and the addition of TeO2 on kinetic and thermodynamic parameters of these processes. Using a combination of dilatometry and DTA measurements in the 100-1400 degrees C temperature range, it was established that both the mechanical activation and the addition of TeO2 have a significant effect on processes in cordierite-based ceramics. A combination of 5 mass% addition of TeO2 and mechanical activation for 40 min reduced the sintering temperature of cordierite ceramics to around 1100 degrees C. In addition, the analysis of DTA measurements of mechanically activated samples indicates that the mechanical activation leads to intensification of the cordierite formation through an increase in concentration of surface defects and an increase in grain contact surface in the initial powder.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Kinetics of thermally activated processes in cordierite-based ceramics",
pages = "2998-2989",
number = "5",
volume = "138",
doi = "10.1007/s10973-018-7924-1",
url = "https://hdl.handle.net/21.15107/rcub_dais_7048, conv_867"
}

Obradović, N., Blagojević, V., Filipović, S., Đorđević, N., Kosanović, D., Marković, S., Kachlik, M., Maca, K.,& Pavlović, V.. (2019). Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 138(5), 2989-2998.
https://doi.org/10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_7048

Obradović N, Blagojević V, Filipović S, Đorđević N, Kosanović D, Marković S, Kachlik M, Maca K, Pavlović V. Kinetics of thermally activated processes in cordierite-based ceramics. in Journal of Thermal Analysis and Calorimetry. 2019;138(5):2989-2998.
doi:10.1007/s10973-018-7924-1
https://hdl.handle.net/21.15107/rcub_dais_7048 .

Obradović, Nina, Blagojević, Vladimir, Filipović, Suzana, Đorđević, Nataša, Kosanović, Darko, Marković, Smilja, Kachlik, Martin, Maca, Karel, Pavlović, Vladimir, "Kinetics of thermally activated processes in cordierite-based ceramics" in Journal of Thermal Analysis and Calorimetry, 138, no. 5 (2019):2989-2998,
https://doi.org/10.1007/s10973-018-7924-1 .,
https://hdl.handle.net/21.15107/rcub_dais_7048 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Đorđević, Nataša
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Kosanović, Darko
AU  - Mitrić, Miodrag
AU  - Pavlović, Vladimir
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/410
AB  - Since cordierite, 2MgO center dot 2Al(2)O(3)center dot 5SiO(2) (MAS), is a very useful high-temperature ceramic material, it is important to decrease its sintering temperature. In order to accelerate the process of sintering, 5.00 mass% MoO3 was added to the starting mixtures. The mechanical activation of the starting mixtures was performed in a high-energy ball mill in time intervals from 0 to 160 min. After the activation, starting mixtures were sintered at 1300 A degrees C for 2 h. In order to determine the impact of mechanical activation on particle size distribution and powders morphology, the mechanically treated powders were characterized by a laser light-scattering particle size analyzer and scanning electron microscopy. The phase composition of the starting mixtures and sintered samples was analyzed by the X-ray diffraction method. In order to determine temperature intervals of chemical reactions and phase transitions, differential thermal analyses (DTA) and thermo-gravimetric analysis were used. Kissinger's equation was employed to calculate apparent activation energies of various processes that occur within the system during heating. Based on the obtained DTA results, it was established that mechanical activation along with MoO3 additive has influence on sintering temperature which was decreased for more than 100 A degrees C, comparing to the literature data.
PB  - Springer, Dordrecht
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA
EP  - 673
IS  - 2
SP  - 667
VL  - 124
DO  - 10.1007/s10973-015-5132-9
UR  - conv_757
ER  - 

@article{
author = "Obradović, Nina and Đorđević, Nataša and Filipović, Suzana and Marković, Smilja and Kosanović, Darko and Mitrić, Miodrag and Pavlović, Vladimir",
year = "2016",
abstract = "Since cordierite, 2MgO center dot 2Al(2)O(3)center dot 5SiO(2) (MAS), is a very useful high-temperature ceramic material, it is important to decrease its sintering temperature. In order to accelerate the process of sintering, 5.00 mass% MoO3 was added to the starting mixtures. The mechanical activation of the starting mixtures was performed in a high-energy ball mill in time intervals from 0 to 160 min. After the activation, starting mixtures were sintered at 1300 A degrees C for 2 h. In order to determine the impact of mechanical activation on particle size distribution and powders morphology, the mechanically treated powders were characterized by a laser light-scattering particle size analyzer and scanning electron microscopy. The phase composition of the starting mixtures and sintered samples was analyzed by the X-ray diffraction method. In order to determine temperature intervals of chemical reactions and phase transitions, differential thermal analyses (DTA) and thermo-gravimetric analysis were used. Kissinger's equation was employed to calculate apparent activation energies of various processes that occur within the system during heating. Based on the obtained DTA results, it was established that mechanical activation along with MoO3 additive has influence on sintering temperature which was decreased for more than 100 A degrees C, comparing to the literature data.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA",
pages = "673-667",
number = "2",
volume = "124",
doi = "10.1007/s10973-015-5132-9",
url = "conv_757"
}

Obradović, N., Đorđević, N., Filipović, S., Marković, S., Kosanović, D., Mitrić, M.,& Pavlović, V.. (2016). Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 124(2), 667-673.
https://doi.org/10.1007/s10973-015-5132-9
conv_757

Obradović N, Đorđević N, Filipović S, Marković S, Kosanović D, Mitrić M, Pavlović V. Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA. in Journal of Thermal Analysis and Calorimetry. 2016;124(2):667-673.
doi:10.1007/s10973-015-5132-9
conv_757 .

Obradović, Nina, Đorđević, Nataša, Filipović, Suzana, Marković, Smilja, Kosanović, Darko, Mitrić, Miodrag, Pavlović, Vladimir, "Reaction kinetics of mechanically activated cordierite-based ceramics studied via DTA" in Journal of Thermal Analysis and Calorimetry, 124, no. 2 (2016):667-673,
https://doi.org/10.1007/s10973-015-5132-9 .,
conv_757 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Pavlović, Vladimir
AU  - Olcan, Dragan
AU  - Đorđević, Antonije
AU  - Kachlik, Martin
AU  - Maca, Karel
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/395
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 (epsilon(r)) and loss tangent (tan delta) as a function of time of mechanical treatment.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Microstructural and Electrical Properties of Cordierite-based Ceramics Obtained After Two-step Sintering Technique
EP  - 165
IS  - 2
SP  - 157
VL  - 48
DO  - 10.2298/SOS1602157O
UR  - https://hdl.handle.net/21.15107/rcub_dais_2314
UR  - conv_766
ER  - 

@article{
author = "Obradović, Nina and Filipović, Suzana and Đorđević, Nataša and Kosanović, Darko and Pavlović, Vladimir and Olcan, 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 (epsilon(r)) and loss tangent (tan delta) as a function of time of mechanical treatment.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Microstructural and Electrical Properties of Cordierite-based Ceramics Obtained After Two-step Sintering Technique",
pages = "165-157",
number = "2",
volume = "48",
doi = "10.2298/SOS1602157O",
url = "https://hdl.handle.net/21.15107/rcub_dais_2314, conv_766"
}

Obradović, N., Filipović, S., Đorđević, N., Kosanović, D., Pavlović, V., Olcan, 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
Međunarodni Institut za nauku o sinterovanju, Beograd., 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 V, Olcan 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, Olcan, 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  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Mitrić, Miodrag N.
AU  - Pavlović, Vladimir B.
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/382
AB  - Ova istraživanja posvećena su uticaju mehaničke aktivacije na strukturu kordijeritne smeše 2MgO+2Al2O3+5SiO2. Praćena su i testirana dva paralelna sistema, jedan bez, i drugi u prisustvu 5 masenih % TeO2 kao aditiva. Mehanička aktivacija prahova vršena je u visoko energetskom mlinu sa kuglama u vremenskom intervalu od 0 do 40 minuta. Tokom aktivacije došlo je do reakcije polaznih komponenti u čvrstoj fazi, pri čemu su nastala intermedijarna jedinjenja. Metoda rendgenske difrakcije je korišćena radi identifikacije faznog sastava tokom reakcije, dok su SEM i PSA metode korišćene za praćenje promene morfologije mehanički tretiranih prahova. Cilj aktivacije polaznih prahova je sniženje temperature i mogućnost da se skrati vreme trajanja procesa sinterovanja u postupku dobijanja krajnjeg proizvoda.
AB  - Cordierite 2MgO+2Al2O3+5SiO2 is frequently used ceramic material, that is commonly used as a carrier of electrical components due to its low dielectric constant (~ 5), and low temperature thermal expansion coefficient (20·10-7 oC-1). In order to accelerate the process of sintering, 5.00 mass% TeO2 was added to the starting mixtures. System was tested in two parallel mixtures, one with no additives, and the other one with TeO2. The mechanical activation of the both mixtures was performed in a highenergy ball mill in time intervals from 0 to 40 min with ball to powder mass ratio 1:40. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders as well as microstructures was analyzed by the means of X-ray diffraction method and SEM.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Uticaj mehaničke aktivacije na sistem MgO-Al2O3-SiO2 u prisustvu aditiva TeO2
T1  - Influence of mechanical activation on MgO-Al2O3-SiO2 system in the presence of TeO2 additive
EP  - 802
IS  - 6
SP  - 797
VL  - 71
DO  - 10.5937/tehnika1606797F
UR  - conv_21
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Đorđević, Nataša and Kosanović, Darko and Marković, Smilja and Mitrić, Miodrag N. and Pavlović, Vladimir B.",
year = "2016",
abstract = "Ova istraživanja posvećena su uticaju mehaničke aktivacije na strukturu kordijeritne smeše 2MgO+2Al2O3+5SiO2. Praćena su i testirana dva paralelna sistema, jedan bez, i drugi u prisustvu 5 masenih % TeO2 kao aditiva. Mehanička aktivacija prahova vršena je u visoko energetskom mlinu sa kuglama u vremenskom intervalu od 0 do 40 minuta. Tokom aktivacije došlo je do reakcije polaznih komponenti u čvrstoj fazi, pri čemu su nastala intermedijarna jedinjenja. Metoda rendgenske difrakcije je korišćena radi identifikacije faznog sastava tokom reakcije, dok su SEM i PSA metode korišćene za praćenje promene morfologije mehanički tretiranih prahova. Cilj aktivacije polaznih prahova je sniženje temperature i mogućnost da se skrati vreme trajanja procesa sinterovanja u postupku dobijanja krajnjeg proizvoda., Cordierite 2MgO+2Al2O3+5SiO2 is frequently used ceramic material, that is commonly used as a carrier of electrical components due to its low dielectric constant (~ 5), and low temperature thermal expansion coefficient (20·10-7 oC-1). In order to accelerate the process of sintering, 5.00 mass% TeO2 was added to the starting mixtures. System was tested in two parallel mixtures, one with no additives, and the other one with TeO2. The mechanical activation of the both mixtures was performed in a highenergy ball mill in time intervals from 0 to 40 min with ball to powder mass ratio 1:40. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders as well as microstructures was analyzed by the means of X-ray diffraction method and SEM.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Uticaj mehaničke aktivacije na sistem MgO-Al2O3-SiO2 u prisustvu aditiva TeO2, Influence of mechanical activation on MgO-Al2O3-SiO2 system in the presence of TeO2 additive",
pages = "802-797",
number = "6",
volume = "71",
doi = "10.5937/tehnika1606797F",
url = "conv_21"
}

Filipović, S., Obradović, N., Đorđević, N., Kosanović, D., Marković, S., Mitrić, M. N.,& Pavlović, V. B.. (2016). Uticaj mehaničke aktivacije na sistem MgO-Al2O3-SiO2 u prisustvu aditiva TeO2. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 71(6), 797-802.
https://doi.org/10.5937/tehnika1606797F
conv_21

Filipović S, Obradović N, Đorđević N, Kosanović D, Marković S, Mitrić MN, Pavlović VB. Uticaj mehaničke aktivacije na sistem MgO-Al2O3-SiO2 u prisustvu aditiva TeO2. in Tehnika. 2016;71(6):797-802.
doi:10.5937/tehnika1606797F
conv_21 .

Filipović, Suzana, Obradović, Nina, Đorđević, Nataša, Kosanović, Darko, Marković, Smilja, Mitrić, Miodrag N., Pavlović, Vladimir B., "Uticaj mehaničke aktivacije na sistem MgO-Al2O3-SiO2 u prisustvu aditiva TeO2" in Tehnika, 71, no. 6 (2016):797-802,
https://doi.org/10.5937/tehnika1606797F .,
conv_21 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Đorđević, Nataša
AU  - Kosanović, Darko
AU  - Marković, Smilja
AU  - Pavlović, Vladimir
AU  - Olcan, Dragan
AU  - Đorđević, Antonije
AU  - Kachlik, Martin
AU  - Maca, Karel
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/393
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 (epsilon(r)) and loss tangent (tan delta) as a function of the time of mechanical treatment.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics
EP  - 13918
IS  - 12
SP  - 13909
VL  - 42
DO  - 10.1016/j.ceramint.2016.05.201
UR  - conv_763
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 and Olcan, 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 (epsilon(r)) and loss tangent (tan delta) as a function of the time of mechanical treatment.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics",
pages = "13918-13909",
number = "12",
volume = "42",
doi = "10.1016/j.ceramint.2016.05.201",
url = "conv_763, https://hdl.handle.net/21.15107/rcub_dais_2322"
}

Obradović, N., Filipović, S., Đorđević, N., Kosanović, D., Marković, S., Pavlović, V., Olcan, 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 Sci Ltd, Oxford., 42(12), 13909-13918.
https://doi.org/10.1016/j.ceramint.2016.05.201
conv_763

Obradović N, Filipović S, Đorđević N, Kosanović D, Marković S, Pavlović V, Olcan 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
conv_763 .

Obradović, Nina, Filipović, Suzana, Đorđević, Nataša, Kosanović, Darko, Marković, Smilja, Pavlović, Vladimir, Olcan, 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 .,
conv_763 .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Mitrić, Miodrag
AU  - Pavlović, V. P.
PY  - 2014
UR  - https://ritnms.itnms.ac.rs/handle/123456789/313
AB  - Cordierite (MAS) is difficult to sinter because of the very narrow sintering temperature range (1300-1400 degrees C). Because a low temperature process is desirable, it is necessary to find functional ads which can allow easier sintering process at lower temperature. The influence of MoO3 on the preparation process of cordierite ceramics was investigated. 2MgO-2Al(2)O(3)-5SiO(2) was researched by sintering followed binary systems: MgO/MoO3, Al2O3/MoO3 and SiO2/MoO3 (all sintered at 850 degrees C and 1100 degrees C, sintering time 2h). Composition of these systems was 80 mass% of oxide and 20 mass% MoO3. The effects of sintering, the composition and morphology were followed by X-ray diffraction and SEM microscopy. It has been found that MoO3, beside liquid phase, forms intermediary unstable compounds with MgO and Al2O3, which is the significance information for further research. MAS ceramics were sintered with 20 mass% MoO3 at 1100 degrees C, 1200 degrees C and 1300 degrees C, during 2h.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis
EP  - 313
IS  - 3
SP  - 307
VL  - 46
DO  - 10.2298/SOS1403307D
UR  - conv_720
ER  - 

@article{
author = "Đorđević, Nataša and Obradović, Nina and Kosanović, Darko and Mitrić, Miodrag and Pavlović, V. P.",
year = "2014",
abstract = "Cordierite (MAS) is difficult to sinter because of the very narrow sintering temperature range (1300-1400 degrees C). Because a low temperature process is desirable, it is necessary to find functional ads which can allow easier sintering process at lower temperature. The influence of MoO3 on the preparation process of cordierite ceramics was investigated. 2MgO-2Al(2)O(3)-5SiO(2) was researched by sintering followed binary systems: MgO/MoO3, Al2O3/MoO3 and SiO2/MoO3 (all sintered at 850 degrees C and 1100 degrees C, sintering time 2h). Composition of these systems was 80 mass% of oxide and 20 mass% MoO3. The effects of sintering, the composition and morphology were followed by X-ray diffraction and SEM microscopy. It has been found that MoO3, beside liquid phase, forms intermediary unstable compounds with MgO and Al2O3, which is the significance information for further research. MAS ceramics were sintered with 20 mass% MoO3 at 1100 degrees C, 1200 degrees C and 1300 degrees C, during 2h.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis",
pages = "313-307",
number = "3",
volume = "46",
doi = "10.2298/SOS1403307D",
url = "conv_720"
}

Đorđević, N., Obradović, N., Kosanović, D., Mitrić, M.,& Pavlović, V. P.. (2014). Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 46(3), 307-313.
https://doi.org/10.2298/SOS1403307D
conv_720

Đorđević N, Obradović N, Kosanović D, Mitrić M, Pavlović VP. Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis. in Science of Sintering. 2014;46(3):307-313.
doi:10.2298/SOS1403307D
conv_720 .

Đorđević, Nataša, Obradović, Nina, Kosanović, Darko, Mitrić, Miodrag, Pavlović, V. P., "Sintering of Cordierite in the Presence of MoO3 and Crystallization Analysis" in Science of Sintering, 46, no. 3 (2014):307-313,
https://doi.org/10.2298/SOS1403307D .,
conv_720 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Đorđević, Nataša
AU  - Filipović, Suzana
AU  - Nikolić, N.
AU  - Kosanović, Darko
AU  - Mitrić, Miodrag
AU  - Marković, Smilja
AU  - Pavlović, Vladimir
PY  - 2012
UR  - https://ritnms.itnms.ac.rs/handle/123456789/202
AB  - Due to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low dielectric constant and good mechanical properties, cordierite, 2MgO center dot 2Al(2)O(3)center dot 5SiO(2), is a very attractive high-temperature ceramic material. In order to accelerate the process of sintering, 2.50 mass% Bi2O3 has been added to the starting mixtures. Liquid phase sintering caused by the presence of bismuth-oxide lowers the temperature of cordierite formation. The mechanical activation of the starting mixtures (0-56 min in vibro-mill) additionally lowers sintering temperatures. The sintering process was performed at 1200, 1300, 1350 and 1400 degrees C, for 2 h. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders and sintered materials was analyzed by the X-ray diffraction method. Furthermore, scanning electron microscopy (SEM) was used in the analysis of the powder morphology.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive
EP  - 161
SP  - 157
VL  - 218
DO  - 10.1016/j.powtec.2011.12.012
UR  - conv_610
ER  - 

@article{
author = "Obradović, Nina and Đorđević, Nataša and Filipović, Suzana and Nikolić, N. and Kosanović, Darko and Mitrić, Miodrag and Marković, Smilja and Pavlović, Vladimir",
year = "2012",
abstract = "Due to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low dielectric constant and good mechanical properties, cordierite, 2MgO center dot 2Al(2)O(3)center dot 5SiO(2), is a very attractive high-temperature ceramic material. In order to accelerate the process of sintering, 2.50 mass% Bi2O3 has been added to the starting mixtures. Liquid phase sintering caused by the presence of bismuth-oxide lowers the temperature of cordierite formation. The mechanical activation of the starting mixtures (0-56 min in vibro-mill) additionally lowers sintering temperatures. The sintering process was performed at 1200, 1300, 1350 and 1400 degrees C, for 2 h. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders and sintered materials was analyzed by the X-ray diffraction method. Furthermore, scanning electron microscopy (SEM) was used in the analysis of the powder morphology.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive",
pages = "161-157",
volume = "218",
doi = "10.1016/j.powtec.2011.12.012",
url = "conv_610"
}

Obradović, N., Đorđević, N., Filipović, S., Nikolić, N., Kosanović, D., Mitrić, M., Marković, S.,& Pavlović, V.. (2012). Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive. in Powder Technology
Elsevier, Amsterdam., 218, 157-161.
https://doi.org/10.1016/j.powtec.2011.12.012
conv_610

Obradović N, Đorđević N, Filipović S, Nikolić N, Kosanović D, Mitrić M, Marković S, Pavlović V. Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive. in Powder Technology. 2012;218:157-161.
doi:10.1016/j.powtec.2011.12.012
conv_610 .

Obradović, Nina, Đorđević, Nataša, Filipović, Suzana, Nikolić, N., Kosanović, Darko, Mitrić, Miodrag, Marković, Smilja, Pavlović, Vladimir, "Influence of mechanochemical activation on the sintering of cordierite ceramics in the presence of Bi2O3 as a functional additive" in Powder Technology, 218 (2012):157-161,
https://doi.org/10.1016/j.powtec.2011.12.012 .,
conv_610 .