TY  - DATA
AU  - Zdujić, Miodrag
AU  - Lukić, Ivana
AU  - Kesić, Željka
AU  - Janković-Častvan, Ivona
AU  - Marković, Smilja
AU  - Jovalekić, Čedomir
AU  - Skala, Dejan
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119300615
UR  - https://dais.sanu.ac.rs/123456789/5974
AB  - The UV–vis diffuse reflectance (DRS) spectra and Kubelka-Munk transformed reflectance spectra of the samples calcined at 700 and 900 oC along
with starting CaO and SiO2 powders used for the synthesis
T2  - Advanced Powder Technology
T1  - Supporting information for the article: Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č., Skala, D., 2019.  Synthesis  of  CaOSiO2  compounds  and  their  testing  as  heterogeneous  catalysts  for transesterification of sunflower oil. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2019.03.009
UR  - https://hdl.handle.net/21.15107/rcub_dais_5974
ER  - 

@misc{
author = "Zdujić, Miodrag and Lukić, Ivana and Kesić, Željka and Janković-Častvan, Ivona and Marković, Smilja and Jovalekić, Čedomir and Skala, Dejan",
year = "2019",
abstract = "The UV–vis diffuse reflectance (DRS) spectra and Kubelka-Munk transformed reflectance spectra of the samples calcined at 700 and 900 oC along
with starting CaO and SiO2 powders used for the synthesis",
journal = "Advanced Powder Technology",
title = "Supporting information for the article: Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č., Skala, D., 2019.  Synthesis  of  CaOSiO2  compounds  and  their  testing  as  heterogeneous  catalysts  for transesterification of sunflower oil. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2019.03.009",
url = "https://hdl.handle.net/21.15107/rcub_dais_5974"
}

Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č.,& Skala, D.. (2019). Supporting information for the article: Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č., Skala, D., 2019.  Synthesis  of  CaOSiO2  compounds  and  their  testing  as  heterogeneous  catalysts  for transesterification of sunflower oil. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2019.03.009. in Advanced Powder Technology.
https://hdl.handle.net/21.15107/rcub_dais_5974

Zdujić M, Lukić I, Kesić Ž, Janković-Častvan I, Marković S, Jovalekić Č, Skala D. Supporting information for the article: Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č., Skala, D., 2019.  Synthesis  of  CaOSiO2  compounds  and  their  testing  as  heterogeneous  catalysts  for transesterification of sunflower oil. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2019.03.009. in Advanced Powder Technology. 2019;.
https://hdl.handle.net/21.15107/rcub_dais_5974 .

Zdujić, Miodrag, Lukić, Ivana, Kesić, Željka, Janković-Častvan, Ivona, Marković, Smilja, Jovalekić, Čedomir, Skala, Dejan, "Supporting information for the article: Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č., Skala, D., 2019.  Synthesis  of  CaOSiO2  compounds  and  their  testing  as  heterogeneous  catalysts  for transesterification of sunflower oil. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2019.03.009" in Advanced Powder Technology (2019),
https://hdl.handle.net/21.15107/rcub_dais_5974 .

TY  - JOUR
AU  - Zdujić, Miodrag
AU  - Lukić, Ivana
AU  - Kesić, Željka
AU  - Janković-Častvan, Ivona
AU  - Marković, Smilja
AU  - Jovalekić, Čedomir
AU  - Skala, Dejan
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119300615
UR  - https://dais.sanu.ac.rs/123456789/5802
AB  - The powder mixtures of calcium oxide (CaO) and silica gel (SiO2) in molar ratios of 1:1, 1.5:1, 2:1 and 3:1 were mechanochemically treated with the addition of water, and were subsequently calcined with a goal of synthesizing CaSiO3, Ca3Si2O7, Ca2SiO4 compounds and CaO/Ca2SiO4 two-phase mixture. The prepared materials were characterized by XRD, FTIR, SEM/EDS, particle size laser diffraction (PSLD), UV–vis diffuse reflectance spectroscopy (DRS), N2 adsorption/desorption isotherms, Hammett indicator for basic strength and volumetric analysis for free CaO content. The catalytic activity of calcium silicates with different Ca/Si ratios was tested in the transesterification of triacylglycerols (sunflower oil) with methanol. Samples obtained with initial composition 2CaO·SiO2 and 3CaO·SiO2 calcined at 700 °C, and 3CaO·SiO2 calcined at 900 °C had high catalytic activity, resulting with triacylglycerols conversion and fatty acids methyl ester formation (FAME or biodiesel) above 96%. The activity of these samples can be attributed to the existence of free CaO defined by CaO/Ca2SiO4 complex mixture. The effect of different amount of catalyst used for transesterification (0.2–2 wt%) was analyzed using the most active catalyst i.e. 3CaO·SiO2 calcined at 700 °C as well as possibility of its reuse for biodiesel synthesis. It was also found that CaSiO3, Ca3Si2O7 and Ca2SiO4, phases did not possess catalytic activity.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil
SP  - 1141
EP  - 1150
VL  - 30
IS  - 6
DO  - 10.1016/j.apt.2019.03.009
UR  - https://hdl.handle.net/21.15107/rcub_dais_5802
ER  - 

@article{
author = "Zdujić, Miodrag and Lukić, Ivana and Kesić, Željka and Janković-Častvan, Ivona and Marković, Smilja and Jovalekić, Čedomir and Skala, Dejan",
year = "2019",
abstract = "The powder mixtures of calcium oxide (CaO) and silica gel (SiO2) in molar ratios of 1:1, 1.5:1, 2:1 and 3:1 were mechanochemically treated with the addition of water, and were subsequently calcined with a goal of synthesizing CaSiO3, Ca3Si2O7, Ca2SiO4 compounds and CaO/Ca2SiO4 two-phase mixture. The prepared materials were characterized by XRD, FTIR, SEM/EDS, particle size laser diffraction (PSLD), UV–vis diffuse reflectance spectroscopy (DRS), N2 adsorption/desorption isotherms, Hammett indicator for basic strength and volumetric analysis for free CaO content. The catalytic activity of calcium silicates with different Ca/Si ratios was tested in the transesterification of triacylglycerols (sunflower oil) with methanol. Samples obtained with initial composition 2CaO·SiO2 and 3CaO·SiO2 calcined at 700 °C, and 3CaO·SiO2 calcined at 900 °C had high catalytic activity, resulting with triacylglycerols conversion and fatty acids methyl ester formation (FAME or biodiesel) above 96%. The activity of these samples can be attributed to the existence of free CaO defined by CaO/Ca2SiO4 complex mixture. The effect of different amount of catalyst used for transesterification (0.2–2 wt%) was analyzed using the most active catalyst i.e. 3CaO·SiO2 calcined at 700 °C as well as possibility of its reuse for biodiesel synthesis. It was also found that CaSiO3, Ca3Si2O7 and Ca2SiO4, phases did not possess catalytic activity.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil",
pages = "1141-1150",
volume = "30",
number = "6",
doi = "10.1016/j.apt.2019.03.009",
url = "https://hdl.handle.net/21.15107/rcub_dais_5802"
}

Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č.,& Skala, D.. (2019). Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology
Elsevier., 30(6), 1141-1150.
https://doi.org/10.1016/j.apt.2019.03.009
https://hdl.handle.net/21.15107/rcub_dais_5802

Zdujić M, Lukić I, Kesić Ž, Janković-Častvan I, Marković S, Jovalekić Č, Skala D. Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology. 2019;30(6):1141-1150.
doi:10.1016/j.apt.2019.03.009
https://hdl.handle.net/21.15107/rcub_dais_5802 .

Zdujić, Miodrag, Lukić, Ivana, Kesić, Željka, Janković-Častvan, Ivona, Marković, Smilja, Jovalekić, Čedomir, Skala, Dejan, "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil" in Advanced Powder Technology, 30, no. 6 (2019):1141-1150,
https://doi.org/10.1016/j.apt.2019.03.009 .,
https://hdl.handle.net/21.15107/rcub_dais_5802 .

TY  - JOUR
AU  - Zdujić, Miodrag
AU  - Lukić, Ivana
AU  - Kesić, Željka
AU  - Janković-Častvan, Ivona
AU  - Marković, Smilja
AU  - Jovalekić, Čedomir
AU  - Skala, Dejan
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0921883119300615
UR  - https://dais.sanu.ac.rs/123456789/5142
AB  - The powder mixtures of calcium oxide (CaO) and silica gel (SiO2) in molar ratios of 1:1, 1.5:1, 2:1 and 3:1 were mechanochemically treated with the addition of water, and were subsequently calcined with a goal of synthesizing CaSiO3, Ca3Si2O7, Ca2SiO4 compounds and CaO/Ca2SiO4 two-phase mixture. The prepared materials were characterized by XRD, FTIR, SEM/EDS, particle size laser diffraction (PSLD), UV–vis diffuse reflectance spectroscopy (DRS), N2 adsorption/desorption isotherms, Hammett indicator for basic strength and volumetric analysis for free CaO content. The catalytic activity of calcium silicates with different Ca/Si ratios was tested in the transesterification of triacylglycerols (sunflower oil) with methanol. Samples obtained with initial composition 2CaO·SiO2 and 3CaO·SiO2 calcined at 700 °C, and 3CaO·SiO2 calcined at 900 °C had high catalytic activity, resulting with triacylglycerols conversion and fatty acids methyl ester formation (FAME or biodiesel) above 96%. The activity of these samples can be attributed to the existence of free CaO defined by CaO/Ca2SiO4 complex mixture. The effect of different amount of catalyst used for transesterification (0.2–2 wt%) was analyzed using the most active catalyst i.e. 3CaO·SiO2 calcined at 700 °C as well as possibility of its reuse for biodiesel synthesis. It was also found that CaSiO3, Ca3Si2O7 and Ca2SiO4, phases did not possess catalytic activity.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil
SP  - 1141
EP  - 1150
VL  - 30
IS  - 6
DO  - 10.1016/j.apt.2019.03.009
UR  - https://hdl.handle.net/21.15107/rcub_dais_5142
ER  - 

@article{
author = "Zdujić, Miodrag and Lukić, Ivana and Kesić, Željka and Janković-Častvan, Ivona and Marković, Smilja and Jovalekić, Čedomir and Skala, Dejan",
year = "2019",
abstract = "The powder mixtures of calcium oxide (CaO) and silica gel (SiO2) in molar ratios of 1:1, 1.5:1, 2:1 and 3:1 were mechanochemically treated with the addition of water, and were subsequently calcined with a goal of synthesizing CaSiO3, Ca3Si2O7, Ca2SiO4 compounds and CaO/Ca2SiO4 two-phase mixture. The prepared materials were characterized by XRD, FTIR, SEM/EDS, particle size laser diffraction (PSLD), UV–vis diffuse reflectance spectroscopy (DRS), N2 adsorption/desorption isotherms, Hammett indicator for basic strength and volumetric analysis for free CaO content. The catalytic activity of calcium silicates with different Ca/Si ratios was tested in the transesterification of triacylglycerols (sunflower oil) with methanol. Samples obtained with initial composition 2CaO·SiO2 and 3CaO·SiO2 calcined at 700 °C, and 3CaO·SiO2 calcined at 900 °C had high catalytic activity, resulting with triacylglycerols conversion and fatty acids methyl ester formation (FAME or biodiesel) above 96%. The activity of these samples can be attributed to the existence of free CaO defined by CaO/Ca2SiO4 complex mixture. The effect of different amount of catalyst used for transesterification (0.2–2 wt%) was analyzed using the most active catalyst i.e. 3CaO·SiO2 calcined at 700 °C as well as possibility of its reuse for biodiesel synthesis. It was also found that CaSiO3, Ca3Si2O7 and Ca2SiO4, phases did not possess catalytic activity.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil",
pages = "1141-1150",
volume = "30",
number = "6",
doi = "10.1016/j.apt.2019.03.009",
url = "https://hdl.handle.net/21.15107/rcub_dais_5142"
}

Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č.,& Skala, D.. (2019). Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology
Elsevier., 30(6), 1141-1150.
https://doi.org/10.1016/j.apt.2019.03.009
https://hdl.handle.net/21.15107/rcub_dais_5142

Zdujić M, Lukić I, Kesić Ž, Janković-Častvan I, Marković S, Jovalekić Č, Skala D. Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology. 2019;30(6):1141-1150.
doi:10.1016/j.apt.2019.03.009
https://hdl.handle.net/21.15107/rcub_dais_5142 .

Zdujić, Miodrag, Lukić, Ivana, Kesić, Željka, Janković-Častvan, Ivona, Marković, Smilja, Jovalekić, Čedomir, Skala, Dejan, "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil" in Advanced Powder Technology, 30, no. 6 (2019):1141-1150,
https://doi.org/10.1016/j.apt.2019.03.009 .,
https://hdl.handle.net/21.15107/rcub_dais_5142 .

TY  - JOUR
AU  - Kesić, Željka
AU  - Lukić, Ivana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Veljković, Vlada B.
AU  - Skala, Dejan
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/2363
AB  - Calcium-containing perovskites CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 were synthesized by calcination of mechanochemically treated stoichiometric mixtures of CaCO3 and either TiO2, MnO2, ZrO2 or Fe2O3 powders. X-ray diffraction analysis revealed a pure single perovskite phase for all four samples after calcination. This study proved that the pure perovskite phase exhibited low or no catalytic activity at 60 °C for the methanolysis of sunflower oil. However, at 165 °C FAME yield of more than 90% was reached after 2 h using CaTiO3, CaMnO3 and CaZrO3 as catalyst. Contrary to inactive pure perovskites at 60 °C, the CaTiO3 and Ca2Fe2O5 samples containing a very small amount of “free” CaO also showed methanolysis activity at 60 °C. This fact can be used to explain some contradictory statements reported in literature related to the perovskites as catalyst for biodiesel synthesis at mild temperatures.
PB  - Elsevier
T2  - Fuel Processing Technology
T1  - Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis
SP  - 162
EP  - 168
VL  - 143
DO  - 10.1016/j.fuproc.2015.11.018
UR  - https://hdl.handle.net/21.15107/rcub_dais_2363
ER  - 

@article{
author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovalekić, Čedomir and Veljković, Vlada B. and Skala, Dejan",
year = "2016",
abstract = "Calcium-containing perovskites CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 were synthesized by calcination of mechanochemically treated stoichiometric mixtures of CaCO3 and either TiO2, MnO2, ZrO2 or Fe2O3 powders. X-ray diffraction analysis revealed a pure single perovskite phase for all four samples after calcination. This study proved that the pure perovskite phase exhibited low or no catalytic activity at 60 °C for the methanolysis of sunflower oil. However, at 165 °C FAME yield of more than 90% was reached after 2 h using CaTiO3, CaMnO3 and CaZrO3 as catalyst. Contrary to inactive pure perovskites at 60 °C, the CaTiO3 and Ca2Fe2O5 samples containing a very small amount of “free” CaO also showed methanolysis activity at 60 °C. This fact can be used to explain some contradictory statements reported in literature related to the perovskites as catalyst for biodiesel synthesis at mild temperatures.",
publisher = "Elsevier",
journal = "Fuel Processing Technology",
title = "Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis",
pages = "162-168",
volume = "143",
doi = "10.1016/j.fuproc.2015.11.018",
url = "https://hdl.handle.net/21.15107/rcub_dais_2363"
}

Kesić, Ž., Lukić, I., Zdujić, M., Jovalekić, Č., Veljković, V. B.,& Skala, D.. (2016). Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis. in Fuel Processing Technology
Elsevier., 143, 162-168.
https://doi.org/10.1016/j.fuproc.2015.11.018
https://hdl.handle.net/21.15107/rcub_dais_2363

Kesić Ž, Lukić I, Zdujić M, Jovalekić Č, Veljković VB, Skala D. Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis. in Fuel Processing Technology. 2016;143:162-168.
doi:10.1016/j.fuproc.2015.11.018
https://hdl.handle.net/21.15107/rcub_dais_2363 .

Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovalekić, Čedomir, Veljković, Vlada B., Skala, Dejan, "Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis" in Fuel Processing Technology, 143 (2016):162-168,
https://doi.org/10.1016/j.fuproc.2015.11.018 .,
https://hdl.handle.net/21.15107/rcub_dais_2363 .

TY  - CONF
AU  - Jugović, Dragana
AU  - Bradarić, Ivica
AU  - Jovalekić, Čedomir
AU  - Barudžija, Tanja
AU  - Kusigerski, Vladan
AU  - Mitrić, Miodrag
PY  - 2016
UR  - https://dais.sanu.ac.rs/123456789/897
AB  - Perovskite oxides with the composition LaFe1-xCrxO3 (x = 0.5 and 0.75) have been studied. The samples have been prepared using the mechanochemical treatment. A mixture of crystalline La(OH)3, Fe2O3 and Cr2O3 powders in stoichiometric ratio was mechanochemically treated in a planetary ball mill up to 40 h of milling. The mechanochemical formation of the LaFe1-xCrxO3 perovskite phase was followed by X-ray diffraction and magnetization measurements. The Rietveld refinement of the XRD data shows that the compounds crystallize in an orthorhombic perovskite structure with a random distribution of the Fe and Cr cations at the B sublattice. All structural and microstructural parameters were analyzed. In addition, magnetic measurements for LaFe0.5Cr0.5O3 show clear antiferromagnetic ordering bellow 250 K, which supports above conclusion of random distribution of Fe and Cr cations.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
T1  - Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)
SP  - 57
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_dais_897
ER  - 

@conference{
author = "Jugović, Dragana and Bradarić, Ivica and Jovalekić, Čedomir and Barudžija, Tanja and Kusigerski, Vladan and Mitrić, Miodrag",
year = "2016",
abstract = "Perovskite oxides with the composition LaFe1-xCrxO3 (x = 0.5 and 0.75) have been studied. The samples have been prepared using the mechanochemical treatment. A mixture of crystalline La(OH)3, Fe2O3 and Cr2O3 powders in stoichiometric ratio was mechanochemically treated in a planetary ball mill up to 40 h of milling. The mechanochemical formation of the LaFe1-xCrxO3 perovskite phase was followed by X-ray diffraction and magnetization measurements. The Rietveld refinement of the XRD data shows that the compounds crystallize in an orthorhombic perovskite structure with a random distribution of the Fe and Cr cations at the B sublattice. All structural and microstructural parameters were analyzed. In addition, magnetic measurements for LaFe0.5Cr0.5O3 show clear antiferromagnetic ordering bellow 250 K, which supports above conclusion of random distribution of Fe and Cr cations.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016",
title = "Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_dais_897"
}

Jugović, D., Bradarić, I., Jovalekić, Č., Barudžija, T., Kusigerski, V.,& Mitrić, M.. (2016). Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75). in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
Belgrade : Materials Research Society of Serbia., 57-57.
https://hdl.handle.net/21.15107/rcub_dais_897

Jugović D, Bradarić I, Jovalekić Č, Barudžija T, Kusigerski V, Mitrić M. Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75). in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016. 2016;:57-57.
https://hdl.handle.net/21.15107/rcub_dais_897 .

Jugović, Dragana, Bradarić, Ivica, Jovalekić, Čedomir, Barudžija, Tanja, Kusigerski, Vladan, Mitrić, Miodrag, "Structural and magnetic properties of mechanochemically synthesized LaFe1-xCrxO3 (x = 0.5 and 0.75)" in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016 (2016):57-57,
https://hdl.handle.net/21.15107/rcub_dais_897 .

TY  - JOUR
AU  - Kesić, Željka
AU  - Lukić, Ivana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Liu, Hui
AU  - Skala, Dejan
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3542
AB  - The goal of this study was to prepare a CaO·ZnO catalyst containing a small amount of K2CO3 and analyze its activity for biodiesel synthesis. The catalyst was prepared using the following procedure: CaO and ZnO (mole ratio of 1:2), water and K2CO3 (in various amounts) were mechanochemically treated and after milling heated at 700 °C in air atmosphere for obtaining mixed CaO·ZnO/xK2CO3 oxides (x = 0, 1, 2 and 4 mol of K2CO3 per 10 mol of CaO). All the samples were characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), particle size laser diffraction (PSLD) distribution, solubility measurement of Ca, Zn and K ions in methanol as well as by determination of their alkalinity (Hammett Indicator method). Prepared CaO·ZnO/xK2CO3 composite powders were tested as catalysts for methanolysis of sunflower oil at 70 °C using mole ratio of sunflower oil to methanol of 1:10 and with 2 mass% of catalyst based on oil weight. The presence of K2CO3 in prepared samples was found to increase the activity of catalyst, and that such effect is caused by homogeneous-heterogeneous catalysis of biodiesel synthesis. © 2015, CI and CEQ. All Rights Reserved.
PB  - Belgrade: Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly
T1  - Mechanochemical synthesis of CaO·ZnO·K2CO3 catalyst: Characterization and activity for methanolysis of sunflower oil
SP  - 1
EP  - 12
VL  - 21
IS  - 1
DO  - 10.2298/CICEQ131026041K
UR  - https://hdl.handle.net/21.15107/rcub_dais_3542
ER  - 

@article{
author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovalekić, Čedomir and Liu, Hui and Skala, Dejan",
year = "2015",
abstract = "The goal of this study was to prepare a CaO·ZnO catalyst containing a small amount of K2CO3 and analyze its activity for biodiesel synthesis. The catalyst was prepared using the following procedure: CaO and ZnO (mole ratio of 1:2), water and K2CO3 (in various amounts) were mechanochemically treated and after milling heated at 700 °C in air atmosphere for obtaining mixed CaO·ZnO/xK2CO3 oxides (x = 0, 1, 2 and 4 mol of K2CO3 per 10 mol of CaO). All the samples were characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), particle size laser diffraction (PSLD) distribution, solubility measurement of Ca, Zn and K ions in methanol as well as by determination of their alkalinity (Hammett Indicator method). Prepared CaO·ZnO/xK2CO3 composite powders were tested as catalysts for methanolysis of sunflower oil at 70 °C using mole ratio of sunflower oil to methanol of 1:10 and with 2 mass% of catalyst based on oil weight. The presence of K2CO3 in prepared samples was found to increase the activity of catalyst, and that such effect is caused by homogeneous-heterogeneous catalysis of biodiesel synthesis. © 2015, CI and CEQ. All Rights Reserved.",
publisher = "Belgrade: Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly",
title = "Mechanochemical synthesis of CaO·ZnO·K2CO3 catalyst: Characterization and activity for methanolysis of sunflower oil",
pages = "1-12",
volume = "21",
number = "1",
doi = "10.2298/CICEQ131026041K",
url = "https://hdl.handle.net/21.15107/rcub_dais_3542"
}

Kesić, Ž., Lukić, I., Zdujić, M., Jovalekić, Č., Liu, H.,& Skala, D.. (2015). Mechanochemical synthesis of CaO·ZnO·K2CO3 catalyst: Characterization and activity for methanolysis of sunflower oil. in Chemical Industry and Chemical Engineering Quarterly
Belgrade: Association of the Chemical Engineers of Serbia., 21(1), 1-12.
https://doi.org/10.2298/CICEQ131026041K
https://hdl.handle.net/21.15107/rcub_dais_3542

Kesić Ž, Lukić I, Zdujić M, Jovalekić Č, Liu H, Skala D. Mechanochemical synthesis of CaO·ZnO·K2CO3 catalyst: Characterization and activity for methanolysis of sunflower oil. in Chemical Industry and Chemical Engineering Quarterly. 2015;21(1):1-12.
doi:10.2298/CICEQ131026041K
https://hdl.handle.net/21.15107/rcub_dais_3542 .

Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovalekić, Čedomir, Liu, Hui, Skala, Dejan, "Mechanochemical synthesis of CaO·ZnO·K2CO3 catalyst: Characterization and activity for methanolysis of sunflower oil" in Chemical Industry and Chemical Engineering Quarterly, 21, no. 1 (2015):1-12,
https://doi.org/10.2298/CICEQ131026041K .,
https://hdl.handle.net/21.15107/rcub_dais_3542 .

TY  - JOUR
AU  - Lukić, Miodrag J.
AU  - Jovalekić, Čedomir
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3548
AB  - Correlation between high-temperature electrical response and microstructural properties of dense hydroxyapatite with average grain size from micrometer to nanometer level in heating/cooling cycle was investigated. Grain interior and grain boundary contributions to overall conductivity were determined. Nanostructured hydroxyapatite exhibited enhanced grain interior conductivity, with significantly higher activation energy (∼2.4 eV) than that of coarsed microstructures (∼1.7 eV). This difference in activation energies is explained by the possible influence of dehydroxylation during materials fabrication procedure, which affected the amount of OH- ions as the main charge carriers. Grain boundary conductivity was similar for all microstructures, with activation energy above ∼2 eV, implying the OH- ions migration across grain boundaries. Electrical response in cooling cycle confirmed the trends found during heating. © 2014 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Research Bulletin
T1  - Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement
SP  - 534
EP  - 538
VL  - 61
DO  - 10.1016/j.materresbull.2014.10.072
UR  - https://hdl.handle.net/21.15107/rcub_dais_3548
ER  - 

@article{
author = "Lukić, Miodrag J. and Jovalekić, Čedomir and Marković, Smilja and Uskoković, Dragan",
year = "2015",
abstract = "Correlation between high-temperature electrical response and microstructural properties of dense hydroxyapatite with average grain size from micrometer to nanometer level in heating/cooling cycle was investigated. Grain interior and grain boundary contributions to overall conductivity were determined. Nanostructured hydroxyapatite exhibited enhanced grain interior conductivity, with significantly higher activation energy (∼2.4 eV) than that of coarsed microstructures (∼1.7 eV). This difference in activation energies is explained by the possible influence of dehydroxylation during materials fabrication procedure, which affected the amount of OH- ions as the main charge carriers. Grain boundary conductivity was similar for all microstructures, with activation energy above ∼2 eV, implying the OH- ions migration across grain boundaries. Electrical response in cooling cycle confirmed the trends found during heating. © 2014 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Research Bulletin",
title = "Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement",
pages = "534-538",
volume = "61",
doi = "10.1016/j.materresbull.2014.10.072",
url = "https://hdl.handle.net/21.15107/rcub_dais_3548"
}

Lukić, M. J., Jovalekić, Č., Marković, S.,& Uskoković, D.. (2015). Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement. in Materials Research Bulletin
Elsevier., 61, 534-538.
https://doi.org/10.1016/j.materresbull.2014.10.072
https://hdl.handle.net/21.15107/rcub_dais_3548

Lukić MJ, Jovalekić Č, Marković S, Uskoković D. Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement. in Materials Research Bulletin. 2015;61:534-538.
doi:10.1016/j.materresbull.2014.10.072
https://hdl.handle.net/21.15107/rcub_dais_3548 .

Lukić, Miodrag J., Jovalekić, Čedomir, Marković, Smilja, Uskoković, Dragan, "Enhanced high-temperature electrical response of hydroxyapatite upon grain size refinement" in Materials Research Bulletin, 61 (2015):534-538,
https://doi.org/10.1016/j.materresbull.2014.10.072 .,
https://hdl.handle.net/21.15107/rcub_dais_3548 .

TY  - CONF
AU  - Kesić, Željka
AU  - Lukić, Ivana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Shao, Yong
AU  - Liu, Hui
AU  - Skala, Dejan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/423
AB  - The mixed oxide of CaO·ZnO and K2CO3 were prepared by ball milling of CaO and ZnO powders and water, with addition of K2CO3 and afterward by calcination at 700 oC. Influence of different molar ratio of K2CO3 and CaO (x=1, 2 and 4 moles of K2CO3 per 10 moles of CaO) was studied . The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning
electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and the particle size laser diffraction (PSLD) distribution. The addition of smaller amount of K2CO3 at the beginning of ball miling (x≤2), favors the formation of calcium zinc hydroxide hydrate, while it is not the case when K2CO3 larger addition was used (x > 2). A larger amount of potassium carbonate in the initial
composition of powder mixture negatively affected formation of CaZn2(OH)6·2H2O. Bimodal distribution were detected for all samples after calcination at 700 oC and the results showed that the distribution of elements in the bulk is not homogeneous and that surface of formed mixed oxide CaO.ZnO (XPS analysis) after calcination is mainly covered by potassium species. That evidence indicate that the K2CO3 was not fully incorporated into the matrix. Prepared samples could be used for methanolysis of vegetable oil and fatty acid methyl esters (FAME, i.e. biodiesel) synthesis.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
T1  - Biodiesel synthesis based on CaO·ZnO.K2CO3 as catalyst
SP  - 46
EP  - 46
UR  - https://hdl.handle.net/21.15107/rcub_dais_423
ER  - 

@conference{
author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovalekić, Čedomir and Shao, Yong and Liu, Hui and Skala, Dejan",
year = "2013",
abstract = "The mixed oxide of CaO·ZnO and K2CO3 were prepared by ball milling of CaO and ZnO powders and water, with addition of K2CO3 and afterward by calcination at 700 oC. Influence of different molar ratio of K2CO3 and CaO (x=1, 2 and 4 moles of K2CO3 per 10 moles of CaO) was studied . The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning
electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and the particle size laser diffraction (PSLD) distribution. The addition of smaller amount of K2CO3 at the beginning of ball miling (x≤2), favors the formation of calcium zinc hydroxide hydrate, while it is not the case when K2CO3 larger addition was used (x > 2). A larger amount of potassium carbonate in the initial
composition of powder mixture negatively affected formation of CaZn2(OH)6·2H2O. Bimodal distribution were detected for all samples after calcination at 700 oC and the results showed that the distribution of elements in the bulk is not homogeneous and that surface of formed mixed oxide CaO.ZnO (XPS analysis) after calcination is mainly covered by potassium species. That evidence indicate that the K2CO3 was not fully incorporated into the matrix. Prepared samples could be used for methanolysis of vegetable oil and fatty acid methyl esters (FAME, i.e. biodiesel) synthesis.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade",
title = "Biodiesel synthesis based on CaO·ZnO.K2CO3 as catalyst",
pages = "46-46",
url = "https://hdl.handle.net/21.15107/rcub_dais_423"
}

Kesić, Ž., Lukić, I., Zdujić, M., Jovalekić, Č., Shao, Y., Liu, H.,& Skala, D.. (2013). Biodiesel synthesis based on CaO·ZnO.K2CO3 as catalyst. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
Belgrade : Serbian Ceramic Society., 46-46.
https://hdl.handle.net/21.15107/rcub_dais_423

Kesić Ž, Lukić I, Zdujić M, Jovalekić Č, Shao Y, Liu H, Skala D. Biodiesel synthesis based on CaO·ZnO.K2CO3 as catalyst. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade. 2013;:46-46.
https://hdl.handle.net/21.15107/rcub_dais_423 .

Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovalekić, Čedomir, Shao, Yong, Liu, Hui, Skala, Dejan, "Biodiesel synthesis based on CaO·ZnO.K2CO3 as catalyst" in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade (2013):46-46,
https://hdl.handle.net/21.15107/rcub_dais_423 .

TY  - CONF
AU  - Kesić, Željka
AU  - Lukić, Ivana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Shao, Yong
AU  - Liu, Hui
AU  - Skala, Dejan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/422
AB  - The mixed oxide of CaO·ZnO and K2CO3 were prepared by ball milling of CaO and ZnO powders and water, with addition of K2CO3 and afterward by calcination at 700 oC. Influence of different molar ratio of K2CO3 and CaO (x=1, 2 and 4 moles of K2CO3 per 10 moles of CaO) was studied . The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and the particle size laser diffraction (PSLD) distribution. The addition of smaller amount of K2CO3 at the beginning of ball miling (x≤2), favors the formation of calcium zinc hydroxide hydrate, while it is not the case when K2CO3 larger addition was used (x > 2). A larger amount of potassium carbonate in the initial composition of powder mixture negatively affected formation of CaZn2(OH)6·2H2O. Bimodal distribution were detected for all samples after calcination at 700 oC and the results showed that the distribution of elements in the bulk is not homogeneous and that surface of formed mixed oxide CaO.ZnO (XPS analysis) after calcination is mainly covered by potassium species. That evidence indicate that the K2CO3 was not fully incorporated into the matrix. Prepared samples could be used for methanolysis of vegetable oil and fatty acid methyl esters (FAME, i.e. biodiesel) synthesis.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
T1  - Characterization of mechanochemically synthesized CaO·ZnO.K2CO3
SP  - 45
EP  - 45
UR  - https://hdl.handle.net/21.15107/rcub_dais_422
ER  - 

@conference{
author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovalekić, Čedomir and Shao, Yong and Liu, Hui and Skala, Dejan",
year = "2013",
abstract = "The mixed oxide of CaO·ZnO and K2CO3 were prepared by ball milling of CaO and ZnO powders and water, with addition of K2CO3 and afterward by calcination at 700 oC. Influence of different molar ratio of K2CO3 and CaO (x=1, 2 and 4 moles of K2CO3 per 10 moles of CaO) was studied . The prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and the particle size laser diffraction (PSLD) distribution. The addition of smaller amount of K2CO3 at the beginning of ball miling (x≤2), favors the formation of calcium zinc hydroxide hydrate, while it is not the case when K2CO3 larger addition was used (x > 2). A larger amount of potassium carbonate in the initial composition of powder mixture negatively affected formation of CaZn2(OH)6·2H2O. Bimodal distribution were detected for all samples after calcination at 700 oC and the results showed that the distribution of elements in the bulk is not homogeneous and that surface of formed mixed oxide CaO.ZnO (XPS analysis) after calcination is mainly covered by potassium species. That evidence indicate that the K2CO3 was not fully incorporated into the matrix. Prepared samples could be used for methanolysis of vegetable oil and fatty acid methyl esters (FAME, i.e. biodiesel) synthesis.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade",
title = "Characterization of mechanochemically synthesized CaO·ZnO.K2CO3",
pages = "45-45",
url = "https://hdl.handle.net/21.15107/rcub_dais_422"
}

Kesić, Ž., Lukić, I., Zdujić, M., Jovalekić, Č., Shao, Y., Liu, H.,& Skala, D.. (2013). Characterization of mechanochemically synthesized CaO·ZnO.K2CO3. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
Belgrade : Serbian Ceramic Society., 45-45.
https://hdl.handle.net/21.15107/rcub_dais_422

Kesić Ž, Lukić I, Zdujić M, Jovalekić Č, Shao Y, Liu H, Skala D. Characterization of mechanochemically synthesized CaO·ZnO.K2CO3. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade. 2013;:45-45.
https://hdl.handle.net/21.15107/rcub_dais_422 .

Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovalekić, Čedomir, Shao, Yong, Liu, Hui, Skala, Dejan, "Characterization of mechanochemically synthesized CaO·ZnO.K2CO3" in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade (2013):45-45,
https://hdl.handle.net/21.15107/rcub_dais_422 .

TY  - CHAP
AU  - Marković, Smilja
AU  - Lukić, Miodrag J.
AU  - Jovalekić, Čedomir
AU  - Škapin, Srečo Davor
AU  - Suvorov, Danilo
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/512
AB  - CCTO powders were prepared by solid state reaction and mechanochemically, respectively. Synthesized powders were characterized by XRD, FE-SEM and PSA techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powders were uniaxially pressed into pellets and sintered up to 1100 °C, with heating rates of 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for choosing conventional and two step sintering (TSS) conditions. By TSS the samples were heated up to 1070 °C and after retention for 10 min cooled down to 1020 °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FE-SEM method; the electrical properties were investigated in medium frequency (MF) range (42 Hz-5 MHz) and in the microwave (MW) range of frequencies. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with high dielectric permittivity in the kilohertz range as well as at the resonant frequency.
PB  - Hoboken, NJ : John Wiley & Sons
T2  - Processing and Properties of Advanced Ceramics and Composites V
T1  - Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics
SP  - 337
EP  - 348
DO  - 10.1002/9781118744109.ch37
UR  - https://hdl.handle.net/21.15107/rcub_dais_512
ER  - 

@inbook{
author = "Marković, Smilja and Lukić, Miodrag J. and Jovalekić, Čedomir and Škapin, Srečo Davor and Suvorov, Danilo and Uskoković, Dragan",
year = "2013",
abstract = "CCTO powders were prepared by solid state reaction and mechanochemically, respectively. Synthesized powders were characterized by XRD, FE-SEM and PSA techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powders were uniaxially pressed into pellets and sintered up to 1100 °C, with heating rates of 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for choosing conventional and two step sintering (TSS) conditions. By TSS the samples were heated up to 1070 °C and after retention for 10 min cooled down to 1020 °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FE-SEM method; the electrical properties were investigated in medium frequency (MF) range (42 Hz-5 MHz) and in the microwave (MW) range of frequencies. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with high dielectric permittivity in the kilohertz range as well as at the resonant frequency.",
publisher = "Hoboken, NJ : John Wiley & Sons",
journal = "Processing and Properties of Advanced Ceramics and Composites V",
booktitle = "Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics",
pages = "337-348",
doi = "10.1002/9781118744109.ch37",
url = "https://hdl.handle.net/21.15107/rcub_dais_512"
}

Marković, S., Lukić, M. J., Jovalekić, Č., Škapin, S. D., Suvorov, D.,& Uskoković, D.. (2013). Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics. in Processing and Properties of Advanced Ceramics and Composites V
Hoboken, NJ : John Wiley & Sons., 337-348.
https://doi.org/10.1002/9781118744109.ch37
https://hdl.handle.net/21.15107/rcub_dais_512

Marković S, Lukić MJ, Jovalekić Č, Škapin SD, Suvorov D, Uskoković D. Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics. in Processing and Properties of Advanced Ceramics and Composites V. 2013;:337-348.
doi:10.1002/9781118744109.ch37
https://hdl.handle.net/21.15107/rcub_dais_512 .

Marković, Smilja, Lukić, Miodrag J., Jovalekić, Čedomir, Škapin, Srečo Davor, Suvorov, Danilo, Uskoković, Dragan, "Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics" in Processing and Properties of Advanced Ceramics and Composites V (2013):337-348,
https://doi.org/10.1002/9781118744109.ch37 .,
https://hdl.handle.net/21.15107/rcub_dais_512 .

TY  - CHAP
AU  - Marković, Smilja
AU  - Lukić, Miodrag J.
AU  - Jovalekić, Čedomir
AU  - Škapin, Srečo Davor
AU  - Suvorov, Danilo
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/511
AB  - CCTO powders were prepared by solid state reaction and mechanochemically, respectively. Synthesized powders were characterized by XRD, FE-SEM and PSA techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powders were uniaxially pressed into pellets and sintered up to 1100 °C, with heating rates of 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for choosing conventional and two step sintering (TSS) conditions. By TSS the samples were heated up to 1070 °C and after retention for 10 min cooled down to 1020 °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FE-SEM method; the electrical properties were investigated in medium frequency (MF) range (42 Hz-5 MHz) and in the microwave (MW) range of frequencies. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with high dielectric permittivity in the kilohertz range as well as at the resonant frequency.
PB  - Hoboken, NJ : John Wiley & Sons
T2  - Processing and Properties of Advanced Ceramics and Composites V
T1  - Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics
SP  - 337
EP  - 348
DO  - 10.1002/9781118744109.ch37
UR  - https://hdl.handle.net/21.15107/rcub_dais_511
ER  - 

@inbook{
author = "Marković, Smilja and Lukić, Miodrag J. and Jovalekić, Čedomir and Škapin, Srečo Davor and Suvorov, Danilo and Uskoković, Dragan",
year = "2013",
abstract = "CCTO powders were prepared by solid state reaction and mechanochemically, respectively. Synthesized powders were characterized by XRD, FE-SEM and PSA techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powders were uniaxially pressed into pellets and sintered up to 1100 °C, with heating rates of 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for choosing conventional and two step sintering (TSS) conditions. By TSS the samples were heated up to 1070 °C and after retention for 10 min cooled down to 1020 °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FE-SEM method; the electrical properties were investigated in medium frequency (MF) range (42 Hz-5 MHz) and in the microwave (MW) range of frequencies. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with high dielectric permittivity in the kilohertz range as well as at the resonant frequency.",
publisher = "Hoboken, NJ : John Wiley & Sons",
journal = "Processing and Properties of Advanced Ceramics and Composites V",
booktitle = "Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics",
pages = "337-348",
doi = "10.1002/9781118744109.ch37",
url = "https://hdl.handle.net/21.15107/rcub_dais_511"
}

Marković, S., Lukić, M. J., Jovalekić, Č., Škapin, S. D., Suvorov, D.,& Uskoković, D.. (2013). Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics. in Processing and Properties of Advanced Ceramics and Composites V
Hoboken, NJ : John Wiley & Sons., 337-348.
https://doi.org/10.1002/9781118744109.ch37
https://hdl.handle.net/21.15107/rcub_dais_511

Marković S, Lukić MJ, Jovalekić Č, Škapin SD, Suvorov D, Uskoković D. Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics. in Processing and Properties of Advanced Ceramics and Composites V. 2013;:337-348.
doi:10.1002/9781118744109.ch37
https://hdl.handle.net/21.15107/rcub_dais_511 .

Marković, Smilja, Lukić, Miodrag J., Jovalekić, Čedomir, Škapin, Srečo Davor, Suvorov, Danilo, Uskoković, Dragan, "Sintering Effects on Microstructure and Electrical Properties of CaCu3Ti4O12 Ceramics" in Processing and Properties of Advanced Ceramics and Composites V (2013):337-348,
https://doi.org/10.1002/9781118744109.ch37 .,
https://hdl.handle.net/21.15107/rcub_dais_511 .

TY  - CONF
AU  - Lukić, Miodrag J.
AU  - Veselinović, Ljiljana
AU  - Jovalekić, Čedomir
AU  - Škapin, Srečo Davor
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/396
AB  - Hydroxyapatite based materials are still the most promising materials in the field of skeletal and dental tissue reconstruction. Improvement of their existing properties and broadening their application fields requires simultaneous achievements in synthesis and processing of advanced nanostructured materials, accompanied by understanding of basic principles governing their behaviour. 
In this study, overall procedure, from synthesis, processing and characterization of dense
nanostructured hydroxyapatite and biphasic calcium phosphate, is presented. The consideration of nanosintering phenomena and influence of phase transformations on sintering behaviour of nanocrystalline Ca-deficient hydroxyapatite will be given. Electrical and mechanical properties will also be determined.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - Two-step sintering, phase transformations, electrical and mechanical properties of nanostructured bioceramic materials based on hydroxyapatite
SP  - 132
EP  - 132
UR  - https://hdl.handle.net/21.15107/rcub_dais_396
ER  - 

@conference{
author = "Lukić, Miodrag J. and Veselinović, Ljiljana and Jovalekić, Čedomir and Škapin, Srečo Davor and Marković, Smilja and Uskoković, Dragan",
year = "2013",
abstract = "Hydroxyapatite based materials are still the most promising materials in the field of skeletal and dental tissue reconstruction. Improvement of their existing properties and broadening their application fields requires simultaneous achievements in synthesis and processing of advanced nanostructured materials, accompanied by understanding of basic principles governing their behaviour. 
In this study, overall procedure, from synthesis, processing and characterization of dense
nanostructured hydroxyapatite and biphasic calcium phosphate, is presented. The consideration of nanosintering phenomena and influence of phase transformations on sintering behaviour of nanocrystalline Ca-deficient hydroxyapatite will be given. Electrical and mechanical properties will also be determined.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "Two-step sintering, phase transformations, electrical and mechanical properties of nanostructured bioceramic materials based on hydroxyapatite",
pages = "132-132",
url = "https://hdl.handle.net/21.15107/rcub_dais_396"
}

Lukić, M. J., Veselinović, L., Jovalekić, Č., Škapin, S. D., Marković, S.,& Uskoković, D.. (2013). Two-step sintering, phase transformations, electrical and mechanical properties of nanostructured bioceramic materials based on hydroxyapatite. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 132-132.
https://hdl.handle.net/21.15107/rcub_dais_396

Lukić MJ, Veselinović L, Jovalekić Č, Škapin SD, Marković S, Uskoković D. Two-step sintering, phase transformations, electrical and mechanical properties of nanostructured bioceramic materials based on hydroxyapatite. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts. 2013;:132-132.
https://hdl.handle.net/21.15107/rcub_dais_396 .

Lukić, Miodrag J., Veselinović, Ljiljana, Jovalekić, Čedomir, Škapin, Srečo Davor, Marković, Smilja, Uskoković, Dragan, "Two-step sintering, phase transformations, electrical and mechanical properties of nanostructured bioceramic materials based on hydroxyapatite" in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts (2013):132-132,
https://hdl.handle.net/21.15107/rcub_dais_396 .

TY  - JOUR
AU  - Barudžija, Tanja
AU  - Gusev, Alexey A.
AU  - Jugović, Dragana
AU  - Marinović Cincović, Milena
AU  - Dramićanin, Miroslav
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Mitrić, Miodrag
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/462
AB  - Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 °C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.
PB  - Belgrade : Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate
SP  - 309
EP  - 315
VL  - 66
VL  - 66
VL  - 66
IS  - 3
IS  - 3
DO  - 10.2298/HEMIND111103103B
UR  - https://hdl.handle.net/21.15107/rcub_dais_462
ER  - 

@article{
author = "Barudžija, Tanja and Gusev, Alexey A. and Jugović, Dragana and Marinović Cincović, Milena and Dramićanin, Miroslav and Zdujić, Miodrag and Jovalekić, Čedomir and Mitrić, Miodrag",
year = "2012",
abstract = "Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 °C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.",
publisher = "Belgrade : Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate",
pages = "309-315",
volume = "66, 66, 66",
number = "3, 3",
doi = "10.2298/HEMIND111103103B",
url = "https://hdl.handle.net/21.15107/rcub_dais_462"
}

Barudžija, T., Gusev, A. A., Jugović, D., Marinović Cincović, M., Dramićanin, M., Zdujić, M., Jovalekić, Č.,& Mitrić, M.. (2012). Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate. in Hemijska industrija
Belgrade : Association of the Chemical Engineers of Serbia., 66(3), 309-315.
https://doi.org/10.2298/HEMIND111103103B
https://hdl.handle.net/21.15107/rcub_dais_462

Barudžija T, Gusev AA, Jugović D, Marinović Cincović M, Dramićanin M, Zdujić M, Jovalekić Č, Mitrić M. Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate. in Hemijska industrija. 2012;66(3):309-315.
doi:10.2298/HEMIND111103103B
https://hdl.handle.net/21.15107/rcub_dais_462 .

Barudžija, Tanja, Gusev, Alexey A., Jugović, Dragana, Marinović Cincović, Milena, Dramićanin, Miroslav, Zdujić, Miodrag, Jovalekić, Čedomir, Mitrić, Miodrag, "Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate" in Hemijska industrija, 66, no. 3 (2012):309-315,
https://doi.org/10.2298/HEMIND111103103B .,
https://hdl.handle.net/21.15107/rcub_dais_462 .

TY  - JOUR
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/270
AB  - Powder mixtures of α-Bi2O3 containing 2, 5 and 10 mole % of TiO2, ZrO2 or HfO2 were homogenized, heated at 820ºC for 24 h and quenched in air. X-ray powder diffraction technique was used to characterize the prepared samples. In all cases metastable Bi2O3 polymorphs, γ-Bi2O3 or β-Bi2O3, are found as single or major phases. Addition of Ti4+ ions stabilizes γ-Bi2O3 polymorph, while either Zr4+ or Hf4+ ions stabilize β-Bi2O3 polymorph. In the samples with 2 and 5 mole % of TiO2 the presence of even two γ-Bi2O3 phases (Bi12TiO20 compound and a very low Ti-doped γ-Bi2O3) was established. Similarly, in the sample with 2 mole % of HfO2 two β-Bi2O3 phases were found. Phase composition of prepared samples, values of unit cell parameters and the appearance of two polymorphs with identical crystal structure but different unit cell parameters are discussed and compared with known data.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf
SP  - 1091
EP  - 1096
VL  - 77
IS  - 8
DO  - 10.2298/JSC110914215P
UR  - https://hdl.handle.net/21.15107/rcub_dais_270
ER  - 

@article{
author = "Poleti, Dejan and Karanović, Ljiljana and Zdujić, Miodrag and Jovalekić, Čedomir",
year = "2012",
abstract = "Powder mixtures of α-Bi2O3 containing 2, 5 and 10 mole % of TiO2, ZrO2 or HfO2 were homogenized, heated at 820ºC for 24 h and quenched in air. X-ray powder diffraction technique was used to characterize the prepared samples. In all cases metastable Bi2O3 polymorphs, γ-Bi2O3 or β-Bi2O3, are found as single or major phases. Addition of Ti4+ ions stabilizes γ-Bi2O3 polymorph, while either Zr4+ or Hf4+ ions stabilize β-Bi2O3 polymorph. In the samples with 2 and 5 mole % of TiO2 the presence of even two γ-Bi2O3 phases (Bi12TiO20 compound and a very low Ti-doped γ-Bi2O3) was established. Similarly, in the sample with 2 mole % of HfO2 two β-Bi2O3 phases were found. Phase composition of prepared samples, values of unit cell parameters and the appearance of two polymorphs with identical crystal structure but different unit cell parameters are discussed and compared with known data.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf",
pages = "1091-1096",
volume = "77",
number = "8",
doi = "10.2298/JSC110914215P",
url = "https://hdl.handle.net/21.15107/rcub_dais_270"
}

Poleti, D., Karanović, L., Zdujić, M.,& Jovalekić, Č.. (2012). Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 77(8), 1091-1096.
https://doi.org/10.2298/JSC110914215P
https://hdl.handle.net/21.15107/rcub_dais_270

Poleti D, Karanović L, Zdujić M, Jovalekić Č. Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf. in Journal of the Serbian Chemical Society. 2012;77(8):1091-1096.
doi:10.2298/JSC110914215P
https://hdl.handle.net/21.15107/rcub_dais_270 .

Poleti, Dejan, Karanović, Ljiljana, Zdujić, Miodrag, Jovalekić, Čedomir, "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf" in Journal of the Serbian Chemical Society, 77, no. 8 (2012):1091-1096,
https://doi.org/10.2298/JSC110914215P .,
https://hdl.handle.net/21.15107/rcub_dais_270 .

TY  - JOUR
AU  - Barudžija, Tanja
AU  - Gusev, Alexey A.
AU  - Jugović, Dragana
AU  - Dramićanin, Miroslav
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Mitrić, Miodrag
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/257
AB  - Nano-sized titanium monoxide (TiO) powder was prepared by mechanochemical synthesis. A mixture of commercial Ti and TiO2 (rutile) powders with the molar ratio of 1:1 was milled in a planetary ball mill for 5, 10, 20, 30 and 60 min under argon atmosphere. The final single-phase titanium monoxide sample was characterized by X-ray diffraction (XRD), magnetic measurements using a superconducting quantum interference device magnetometer (SQUID) and thermogravimetric analysis (TGA). The temperature dependency of the magnetic susceptibility is characterized by significant contribution of Pauli paramagnetism due to conduction electrons.
PB  - Belgrade : Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide
SP  - 181
EP  - 186
VL  - 66
VL  - 66
IS  - 2
DO  - 10.2298/HEMIND111027090B
UR  - https://hdl.handle.net/21.15107/rcub_dais_257
ER  - 

@article{
author = "Barudžija, Tanja and Gusev, Alexey A. and Jugović, Dragana and Dramićanin, Miroslav and Zdujić, Miodrag and Jovalekić, Čedomir and Mitrić, Miodrag",
year = "2012",
abstract = "Nano-sized titanium monoxide (TiO) powder was prepared by mechanochemical synthesis. A mixture of commercial Ti and TiO2 (rutile) powders with the molar ratio of 1:1 was milled in a planetary ball mill for 5, 10, 20, 30 and 60 min under argon atmosphere. The final single-phase titanium monoxide sample was characterized by X-ray diffraction (XRD), magnetic measurements using a superconducting quantum interference device magnetometer (SQUID) and thermogravimetric analysis (TGA). The temperature dependency of the magnetic susceptibility is characterized by significant contribution of Pauli paramagnetism due to conduction electrons.",
publisher = "Belgrade : Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide",
pages = "181-186",
volume = "66, 66",
number = "2",
doi = "10.2298/HEMIND111027090B",
url = "https://hdl.handle.net/21.15107/rcub_dais_257"
}

Barudžija, T., Gusev, A. A., Jugović, D., Dramićanin, M., Zdujić, M., Jovalekić, Č.,& Mitrić, M.. (2012). Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide. in Hemijska industrija
Belgrade : Association of the Chemical Engineers of Serbia., 66(2), 181-186.
https://doi.org/10.2298/HEMIND111027090B
https://hdl.handle.net/21.15107/rcub_dais_257

Barudžija T, Gusev AA, Jugović D, Dramićanin M, Zdujić M, Jovalekić Č, Mitrić M. Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide. in Hemijska industrija. 2012;66(2):181-186.
doi:10.2298/HEMIND111027090B
https://hdl.handle.net/21.15107/rcub_dais_257 .

Barudžija, Tanja, Gusev, Alexey A., Jugović, Dragana, Dramićanin, Miroslav, Zdujić, Miodrag, Jovalekić, Čedomir, Mitrić, Miodrag, "Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide" in Hemijska industrija, 66, no. 2 (2012):181-186,
https://doi.org/10.2298/HEMIND111027090B .,
https://hdl.handle.net/21.15107/rcub_dais_257 .

TY  - CONF
AU  - Marković, Smilja
AU  - Lukić, Miodrag J.
AU  - Jovalekić, Čedomir
AU  - Škapin, Srečo Davor
AU  - Suvorov, Danilo
AU  - Uskoković, Dragan
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/437
AB  - A perovskite-type compound, calcium copper titanate (CaCu3Ti4O12, CCTO) attracted ever increasing attention for its practical applications in microelectronics, especially for preparation of capacitors and memory devices. CCTO ceramics are very attractive because of their giant dielectric constant (∼104−105) in the kilohertz region at room temperature, and their good stability over a wide temperature range from 100 to 600 K. Here, CCTO powder was prepared by solid state reaction between CaCO3, CuO and TiO2 at 1000 °C for 12 hours. Synthesized powder was characterized by XRD, FTIR and FESEM techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powder was uniaxially pressed into pallets (Ø 6 mm) and sintered up to 1100 °C, with 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for calculation of activation energy for sintering process, and furthermore, for choosing two step sintering (TSS) conditions. By TSS the samples were heated up to 1050 (1070) °C and after retention for 10 min the cooled down to 1000 (1020) °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FESEM method; the electrical properties were investigated by ac impedance spectroscopy over the ranges 1000 - 25 °C and 40 Hz - 5 MHz. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with giant dielectric permittivity.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
T1  - Sintering effects on microstructure and dielectric properties of CCTO ceramics
SP  - 74
EP  - 74
UR  - https://hdl.handle.net/21.15107/rcub_dais_437
ER  - 

@conference{
author = "Marković, Smilja and Lukić, Miodrag J. and Jovalekić, Čedomir and Škapin, Srečo Davor and Suvorov, Danilo and Uskoković, Dragan",
year = "2012",
abstract = "A perovskite-type compound, calcium copper titanate (CaCu3Ti4O12, CCTO) attracted ever increasing attention for its practical applications in microelectronics, especially for preparation of capacitors and memory devices. CCTO ceramics are very attractive because of their giant dielectric constant (∼104−105) in the kilohertz region at room temperature, and their good stability over a wide temperature range from 100 to 600 K. Here, CCTO powder was prepared by solid state reaction between CaCO3, CuO and TiO2 at 1000 °C for 12 hours. Synthesized powder was characterized by XRD, FTIR and FESEM techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powder was uniaxially pressed into pallets (Ø 6 mm) and sintered up to 1100 °C, with 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for calculation of activation energy for sintering process, and furthermore, for choosing two step sintering (TSS) conditions. By TSS the samples were heated up to 1050 (1070) °C and after retention for 10 min the cooled down to 1000 (1020) °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FESEM method; the electrical properties were investigated by ac impedance spectroscopy over the ranges 1000 - 25 °C and 40 Hz - 5 MHz. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with giant dielectric permittivity.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts",
title = "Sintering effects on microstructure and dielectric properties of CCTO ceramics",
pages = "74-74",
url = "https://hdl.handle.net/21.15107/rcub_dais_437"
}

Marković, S., Lukić, M. J., Jovalekić, Č., Škapin, S. D., Suvorov, D.,& Uskoković, D.. (2012). Sintering effects on microstructure and dielectric properties of CCTO ceramics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 74-74.
https://hdl.handle.net/21.15107/rcub_dais_437

Marković S, Lukić MJ, Jovalekić Č, Škapin SD, Suvorov D, Uskoković D. Sintering effects on microstructure and dielectric properties of CCTO ceramics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts. 2012;:74-74.
https://hdl.handle.net/21.15107/rcub_dais_437 .

Marković, Smilja, Lukić, Miodrag J., Jovalekić, Čedomir, Škapin, Srečo Davor, Suvorov, Danilo, Uskoković, Dragan, "Sintering effects on microstructure and dielectric properties of CCTO ceramics" in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts (2012):74-74,
https://hdl.handle.net/21.15107/rcub_dais_437 .

TY  - JOUR
AU  - Marković, Smilja
AU  - Jovalekić, Čedomir
AU  - Veselinović, Ljiljana
AU  - Mentus, Slavko
AU  - Uskoković, Dragan
PY  - 2010
UR  - https://dais.sanu.ac.rs/123456789/3425
AB  - Barium titanate stannate (BTS) functionally graded materials (FGMs) with different tin/titanium concentration gradient were prepared by the powder-stacking method and uniaxially pressing process, followed by sintering. Impedance spectroscopy (IS) was used to determine the electrical characteristics of FGMs and ingredient BTS ceramics, as well as to distinguish the grain-interior and grain boundary resistivity of the ceramics. Activation energies of FGMs and ingredients were calculated. It has been established that for BTS ceramics the activation energy deduced from grain-interior conductivity (0.73-0.75 eV) is defined by chemical composition, while activation energy for grain boundary conductivity (1.07-1.25 eV) is influenced by microstructural development (density and average grain size). Furthermore, for FGMs, activation energy for grain-interior conductivity kept the intrinsic properties (0.74-0.78 eV) and did not depend on tin/titanium concentration gradient, while activation energy (1.03-1.29 eV) for grain boundary was determined by the microstructural gradient. No point dissipation was observed by IS, accordingly, no insulator interfaces (cracks and/or delamination) between graded layers were detected. © 2009 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Journal of the European Ceramic Society
T1  - Electrical properties of barium titanate stannate functionally graded materials
SP  - 1427
EP  - 1435
VL  - 30
IS  - 6
DO  - 10.1016/j.jeurceramsoc.2009.10.020
UR  - https://hdl.handle.net/21.15107/rcub_dais_3425
ER  - 

@article{
author = "Marković, Smilja and Jovalekić, Čedomir and Veselinović, Ljiljana and Mentus, Slavko and Uskoković, Dragan",
year = "2010",
abstract = "Barium titanate stannate (BTS) functionally graded materials (FGMs) with different tin/titanium concentration gradient were prepared by the powder-stacking method and uniaxially pressing process, followed by sintering. Impedance spectroscopy (IS) was used to determine the electrical characteristics of FGMs and ingredient BTS ceramics, as well as to distinguish the grain-interior and grain boundary resistivity of the ceramics. Activation energies of FGMs and ingredients were calculated. It has been established that for BTS ceramics the activation energy deduced from grain-interior conductivity (0.73-0.75 eV) is defined by chemical composition, while activation energy for grain boundary conductivity (1.07-1.25 eV) is influenced by microstructural development (density and average grain size). Furthermore, for FGMs, activation energy for grain-interior conductivity kept the intrinsic properties (0.74-0.78 eV) and did not depend on tin/titanium concentration gradient, while activation energy (1.03-1.29 eV) for grain boundary was determined by the microstructural gradient. No point dissipation was observed by IS, accordingly, no insulator interfaces (cracks and/or delamination) between graded layers were detected. © 2009 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of the European Ceramic Society",
title = "Electrical properties of barium titanate stannate functionally graded materials",
pages = "1427-1435",
volume = "30",
number = "6",
doi = "10.1016/j.jeurceramsoc.2009.10.020",
url = "https://hdl.handle.net/21.15107/rcub_dais_3425"
}

Marković, S., Jovalekić, Č., Veselinović, L., Mentus, S.,& Uskoković, D.. (2010). Electrical properties of barium titanate stannate functionally graded materials. in Journal of the European Ceramic Society
Elsevier., 30(6), 1427-1435.
https://doi.org/10.1016/j.jeurceramsoc.2009.10.020
https://hdl.handle.net/21.15107/rcub_dais_3425

Marković S, Jovalekić Č, Veselinović L, Mentus S, Uskoković D. Electrical properties of barium titanate stannate functionally graded materials. in Journal of the European Ceramic Society. 2010;30(6):1427-1435.
doi:10.1016/j.jeurceramsoc.2009.10.020
https://hdl.handle.net/21.15107/rcub_dais_3425 .

Marković, Smilja, Jovalekić, Čedomir, Veselinović, Ljiljana, Mentus, Slavko, Uskoković, Dragan, "Electrical properties of barium titanate stannate functionally graded materials" in Journal of the European Ceramic Society, 30, no. 6 (2010):1427-1435,
https://doi.org/10.1016/j.jeurceramsoc.2009.10.020 .,
https://hdl.handle.net/21.15107/rcub_dais_3425 .

TY  - JOUR
AU  - Jovalekić, Čedomir
AU  - Zdujić, Miodrag
PY  - 2010
UR  - https://dais.sanu.ac.rs/123456789/3431
AB  - The effect of thermal treatment atmosphere (argon, air or oxygen) on the electret behavior of bismuth titanate (Bi4Ti3O12) ceramics was investigated. Polycrystalline ferroelectric ceramics were prepared by reactive liquid phase sintering. Sintered samples were polarized applying an electric field, Ep = 1 MV m-1 at 100 °C for 60 min. Effective surface density, σeff of free charges was determined by compensation voltage measurements. Thermally treated samples in oxygen atmosphere exhibit a significant decrease of σeff while those treated in argon exhibit an increase of σeff accompanied by the improvement in stability of electret charge. In all cases homocharge with a time independent sign was obtained. © 2009 Elsevier Ltd and Techna Group S.r.l.
PB  - Elsevier
T2  - Ceramics International
T1  - Electret state in Bi4Ti3O12 ceramics
SP  - 789
EP  - 792
VL  - 36
IS  - 2
DO  - 10.1016/j.ceramint.2009.09.019
UR  - https://hdl.handle.net/21.15107/rcub_dais_3431
ER  - 

@article{
author = "Jovalekić, Čedomir and Zdujić, Miodrag",
year = "2010",
abstract = "The effect of thermal treatment atmosphere (argon, air or oxygen) on the electret behavior of bismuth titanate (Bi4Ti3O12) ceramics was investigated. Polycrystalline ferroelectric ceramics were prepared by reactive liquid phase sintering. Sintered samples were polarized applying an electric field, Ep = 1 MV m-1 at 100 °C for 60 min. Effective surface density, σeff of free charges was determined by compensation voltage measurements. Thermally treated samples in oxygen atmosphere exhibit a significant decrease of σeff while those treated in argon exhibit an increase of σeff accompanied by the improvement in stability of electret charge. In all cases homocharge with a time independent sign was obtained. © 2009 Elsevier Ltd and Techna Group S.r.l.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Electret state in Bi4Ti3O12 ceramics",
pages = "789-792",
volume = "36",
number = "2",
doi = "10.1016/j.ceramint.2009.09.019",
url = "https://hdl.handle.net/21.15107/rcub_dais_3431"
}

Jovalekić, Č.,& Zdujić, M.. (2010). Electret state in Bi4Ti3O12 ceramics. in Ceramics International
Elsevier., 36(2), 789-792.
https://doi.org/10.1016/j.ceramint.2009.09.019
https://hdl.handle.net/21.15107/rcub_dais_3431

Jovalekić Č, Zdujić M. Electret state in Bi4Ti3O12 ceramics. in Ceramics International. 2010;36(2):789-792.
doi:10.1016/j.ceramint.2009.09.019
https://hdl.handle.net/21.15107/rcub_dais_3431 .

Jovalekić, Čedomir, Zdujić, Miodrag, "Electret state in Bi4Ti3O12 ceramics" in Ceramics International, 36, no. 2 (2010):789-792,
https://doi.org/10.1016/j.ceramint.2009.09.019 .,
https://hdl.handle.net/21.15107/rcub_dais_3431 .

TY  - JOUR
AU  - Marković, Smilja
AU  - Miljković, Miroslav
AU  - Jovalekić, Čedomir
AU  - Mentus, Slavko
AU  - Uskoković, Dragan
PY  - 2009
UR  - https://dais.sanu.ac.rs/123456789/178
AB  - In this study, a correlation between densification, microstructure, and electrical properties of BaTiO3 (BT) ceramics prepared from ultrasonically de-agglomerated BT powders has been analyzed. BT powders with the same crystal structure (tetragonal) and stoichiometry, but with different average particle size, were used to prepare sintered ceramics. Densification and electrical properties of the sintered BT ceramics were correlated to the average particle size of the powders. It was found that a decrease in average particle size improved the densification process as well as the ceramics' microstructure. The impedance measurements were done up to 320°C in order to separate grain (bulk) and grain boundary contributions. Bulk resistance was more or less the same, independent on the average particle size of the powder. On the contrary, grain boundary resistance increased with decreasing average particle size of the powder.
PB  - Taylor & Francis
T2  - Materials and Manufacturing Processes
T1  - Densification, Microstructure, and Electrical Properties of BaTiO3 (BT) Ceramics Prepared from Ultrasonically De-Agglomerated BT Powders
SP  - 1114
EP  - 1123
VL  - 24
IS  - 10-11
DO  - 10.1080/10426910903031750
UR  - https://hdl.handle.net/21.15107/rcub_dais_178
ER  - 

@article{
author = "Marković, Smilja and Miljković, Miroslav and Jovalekić, Čedomir and Mentus, Slavko and Uskoković, Dragan",
year = "2009",
abstract = "In this study, a correlation between densification, microstructure, and electrical properties of BaTiO3 (BT) ceramics prepared from ultrasonically de-agglomerated BT powders has been analyzed. BT powders with the same crystal structure (tetragonal) and stoichiometry, but with different average particle size, were used to prepare sintered ceramics. Densification and electrical properties of the sintered BT ceramics were correlated to the average particle size of the powders. It was found that a decrease in average particle size improved the densification process as well as the ceramics' microstructure. The impedance measurements were done up to 320°C in order to separate grain (bulk) and grain boundary contributions. Bulk resistance was more or less the same, independent on the average particle size of the powder. On the contrary, grain boundary resistance increased with decreasing average particle size of the powder.",
publisher = "Taylor & Francis",
journal = "Materials and Manufacturing Processes",
title = "Densification, Microstructure, and Electrical Properties of BaTiO3 (BT) Ceramics Prepared from Ultrasonically De-Agglomerated BT Powders",
pages = "1114-1123",
volume = "24",
number = "10-11",
doi = "10.1080/10426910903031750",
url = "https://hdl.handle.net/21.15107/rcub_dais_178"
}

Marković, S., Miljković, M., Jovalekić, Č., Mentus, S.,& Uskoković, D.. (2009). Densification, Microstructure, and Electrical Properties of BaTiO3 (BT) Ceramics Prepared from Ultrasonically De-Agglomerated BT Powders. in Materials and Manufacturing Processes
Taylor & Francis., 24(10-11), 1114-1123.
https://doi.org/10.1080/10426910903031750
https://hdl.handle.net/21.15107/rcub_dais_178

Marković S, Miljković M, Jovalekić Č, Mentus S, Uskoković D. Densification, Microstructure, and Electrical Properties of BaTiO3 (BT) Ceramics Prepared from Ultrasonically De-Agglomerated BT Powders. in Materials and Manufacturing Processes. 2009;24(10-11):1114-1123.
doi:10.1080/10426910903031750
https://hdl.handle.net/21.15107/rcub_dais_178 .

Marković, Smilja, Miljković, Miroslav, Jovalekić, Čedomir, Mentus, Slavko, Uskoković, Dragan, "Densification, Microstructure, and Electrical Properties of BaTiO3 (BT) Ceramics Prepared from Ultrasonically De-Agglomerated BT Powders" in Materials and Manufacturing Processes, 24, no. 10-11 (2009):1114-1123,
https://doi.org/10.1080/10426910903031750 .,
https://hdl.handle.net/21.15107/rcub_dais_178 .

TY  - JOUR
AU  - Jovalekić, Čedomir
AU  - Zdujić, Miodrag
AU  - Atanasoska, Ljiljana
PY  - 2009
UR  - https://dais.sanu.ac.rs/123456789/3469
AB  - The Auger and XPS technique has been used for investigation in the surface of bismuth titanate (Bi4Ti3O12) (BIT) ceramics obtained by reactive sintering from Bi2O3 and TiO2 oxides. All peaks characteristic for bismuth, titanium and oxygen are clearly visible in the spectrum. Oxygen vacancies are preferentially sited in the vicinity of bismuth ions observed by our X-ray photoemission data. The variation in the valence state of titanium ions is also possible. The XPS and AES measurements confirm that the surface elemental composition of bismuth titanate ceramics does not deviate from nominal bulk composition. © 2008 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Journal of Alloys and Compounds
T1  - Surface analysis of bismuth titanate by Auger and X-ray photoelectron spectroscopy
SP  - 441
EP  - 444
VL  - 469
IS  - 1-2
DO  - 10.1016/j.jallcom.2008.01.131
UR  - https://hdl.handle.net/21.15107/rcub_dais_3469
ER  - 

@article{
author = "Jovalekić, Čedomir and Zdujić, Miodrag and Atanasoska, Ljiljana",
year = "2009",
abstract = "The Auger and XPS technique has been used for investigation in the surface of bismuth titanate (Bi4Ti3O12) (BIT) ceramics obtained by reactive sintering from Bi2O3 and TiO2 oxides. All peaks characteristic for bismuth, titanium and oxygen are clearly visible in the spectrum. Oxygen vacancies are preferentially sited in the vicinity of bismuth ions observed by our X-ray photoemission data. The variation in the valence state of titanium ions is also possible. The XPS and AES measurements confirm that the surface elemental composition of bismuth titanate ceramics does not deviate from nominal bulk composition. © 2008 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of Alloys and Compounds",
title = "Surface analysis of bismuth titanate by Auger and X-ray photoelectron spectroscopy",
pages = "441-444",
volume = "469",
number = "1-2",
doi = "10.1016/j.jallcom.2008.01.131",
url = "https://hdl.handle.net/21.15107/rcub_dais_3469"
}

Jovalekić, Č., Zdujić, M.,& Atanasoska, L.. (2009). Surface analysis of bismuth titanate by Auger and X-ray photoelectron spectroscopy. in Journal of Alloys and Compounds
Elsevier., 469(1-2), 441-444.
https://doi.org/10.1016/j.jallcom.2008.01.131
https://hdl.handle.net/21.15107/rcub_dais_3469

Jovalekić Č, Zdujić M, Atanasoska L. Surface analysis of bismuth titanate by Auger and X-ray photoelectron spectroscopy. in Journal of Alloys and Compounds. 2009;469(1-2):441-444.
doi:10.1016/j.jallcom.2008.01.131
https://hdl.handle.net/21.15107/rcub_dais_3469 .

Jovalekić, Čedomir, Zdujić, Miodrag, Atanasoska, Ljiljana, "Surface analysis of bismuth titanate by Auger and X-ray photoelectron spectroscopy" in Journal of Alloys and Compounds, 469, no. 1-2 (2009):441-444,
https://doi.org/10.1016/j.jallcom.2008.01.131 .,
https://hdl.handle.net/21.15107/rcub_dais_3469 .

TY  - JOUR
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Poleti, Dejan
AU  - Veljković, Ivana
AU  - Karanović, Ljiljana
PY  - 2009
UR  - https://dais.sanu.ac.rs/123456789/3454
AB  - Concurrent milling of Bi4Ti3O12 was carried out in a planetary ball mill with hardened-steel 13 or 6 mm diameter balls with a goal to investigate how the system responds to the constrains imposed by milling. Milling intensity for various milling parameters was derived from the electrical power measurement. The reverse amorphous ↔ crystalline phase transition induced by milling is governed by impact energy and frequency. Below a certain threshold value of impact energy crystallization does not occur, whereas a higher impact frequency accelerates amorphization. Mechanochemical reactions are predominantly discrete processes, which occur at the moment of impact. © 2009 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Letters
T1  - Mechanochemically induced amorphous/crystalline phase transition in the Bi4Ti3O12 compound
SP  - 2542
EP  - 2544
VL  - 63
IS  - 29
DO  - 10.1016/j.matlet.2009.08.055
UR  - https://hdl.handle.net/21.15107/rcub_dais_3454
ER  - 

@article{
author = "Zdujić, Miodrag and Jovalekić, Čedomir and Poleti, Dejan and Veljković, Ivana and Karanović, Ljiljana",
year = "2009",
abstract = "Concurrent milling of Bi4Ti3O12 was carried out in a planetary ball mill with hardened-steel 13 or 6 mm diameter balls with a goal to investigate how the system responds to the constrains imposed by milling. Milling intensity for various milling parameters was derived from the electrical power measurement. The reverse amorphous ↔ crystalline phase transition induced by milling is governed by impact energy and frequency. Below a certain threshold value of impact energy crystallization does not occur, whereas a higher impact frequency accelerates amorphization. Mechanochemical reactions are predominantly discrete processes, which occur at the moment of impact. © 2009 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Letters",
title = "Mechanochemically induced amorphous/crystalline phase transition in the Bi4Ti3O12 compound",
pages = "2542-2544",
volume = "63",
number = "29",
doi = "10.1016/j.matlet.2009.08.055",
url = "https://hdl.handle.net/21.15107/rcub_dais_3454"
}

Zdujić, M., Jovalekić, Č., Poleti, D., Veljković, I.,& Karanović, L.. (2009). Mechanochemically induced amorphous/crystalline phase transition in the Bi4Ti3O12 compound. in Materials Letters
Elsevier., 63(29), 2542-2544.
https://doi.org/10.1016/j.matlet.2009.08.055
https://hdl.handle.net/21.15107/rcub_dais_3454

Zdujić M, Jovalekić Č, Poleti D, Veljković I, Karanović L. Mechanochemically induced amorphous/crystalline phase transition in the Bi4Ti3O12 compound. in Materials Letters. 2009;63(29):2542-2544.
doi:10.1016/j.matlet.2009.08.055
https://hdl.handle.net/21.15107/rcub_dais_3454 .

Zdujić, Miodrag, Jovalekić, Čedomir, Poleti, Dejan, Veljković, Ivana, Karanović, Ljiljana, "Mechanochemically induced amorphous/crystalline phase transition in the Bi4Ti3O12 compound" in Materials Letters, 63, no. 29 (2009):2542-2544,
https://doi.org/10.1016/j.matlet.2009.08.055 .,
https://hdl.handle.net/21.15107/rcub_dais_3454 .

TY  - JOUR
AU  - Zdujić, Miodrag
AU  - Poleti, Dejan
AU  - Jovalekić, Čedomir
AU  - Karanović, Ljiljana
PY  - 2009
UR  - https://dais.sanu.ac.rs/123456789/174
AB  - A powder mixture of α-Bi2O3 and HfO2, in the molar ratio 2:3, was mechanochemically treated in a planetary ball mill under air, using zirconium oxide vials and balls as the milling medium. After 50 h of milling, the mechanochemical reaction led to the formation of a nanocrystalline δ-Bi2O3 phase (fluorite-type solid solution Bi0.78Hf0.59Zr0.63O3.61), with a crystallite size of 20 nm. The mechanochemical reaction started at a very beginning of milling accompanied by an accumulation of ZrO2 arising from the milling tools. The samples prepared after various milling times were characterized by X-ray powder diffraction and DSC analysis. The electrical properties of the as-milled and pressed Bi0.78Hf0.59Zr0.63O3.61 powder were studied using impedance spectroscopy in the temperature range from 100 to 700°C under air. The electrical conductivity was determined to be 9.43×10-6 and 0.080 S cm-1 for the temperatures of 300 and 700°C, respectively.
AB  - Smeša prahova α-Bi2O3 i HfO2 u molarnom odnosu 2:3 mehanohemijski je tretirana u planetarnom mlinu u atmosferi vazduha, koristeći cirkonijumske posude i kuglice kao medijum za mlevenje. Posle 50 h mlevenja, mehanohemijska reakcija dovodi do stvaranja nanokristalne δ-Bi2O3 faze (čvrsti rastvor fluoritske strukture Bi0,78Hf0,59Zr0,63O3,61), veličine kristalita 20 nm. Mehanohemijska reakcija otpočinje u samom početku mlevenja i praćena je akumulacijum ZrO2 koji potiče od medijuma za mlevenje. Uzorci dobijeni posle različitih vremena mlevenja karakterisani su rendgenskom strukturnom i termijskom analizom. Električna svojstva mlevenih i presovanih Bi0,78Hf0,59Zr0,63O3,61 prahova ispitivana su impedansnom spektroskopijom u temperaturnom opsegu od 100 do 700°C. Dobijena električna provodnost je 9,43·10-6 i 0,080 S cm-1 za temperaturu 300 i 700°C, redom.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2
SP  - 1401
EP  - 1411
VL  - 74
IS  - 12
DO  - 10.2298/JSC0912401Z
UR  - https://hdl.handle.net/21.15107/rcub_dais_174
ER  - 

@article{
author = "Zdujić, Miodrag and Poleti, Dejan and Jovalekić, Čedomir and Karanović, Ljiljana",
year = "2009",
abstract = "A powder mixture of α-Bi2O3 and HfO2, in the molar ratio 2:3, was mechanochemically treated in a planetary ball mill under air, using zirconium oxide vials and balls as the milling medium. After 50 h of milling, the mechanochemical reaction led to the formation of a nanocrystalline δ-Bi2O3 phase (fluorite-type solid solution Bi0.78Hf0.59Zr0.63O3.61), with a crystallite size of 20 nm. The mechanochemical reaction started at a very beginning of milling accompanied by an accumulation of ZrO2 arising from the milling tools. The samples prepared after various milling times were characterized by X-ray powder diffraction and DSC analysis. The electrical properties of the as-milled and pressed Bi0.78Hf0.59Zr0.63O3.61 powder were studied using impedance spectroscopy in the temperature range from 100 to 700°C under air. The electrical conductivity was determined to be 9.43×10-6 and 0.080 S cm-1 for the temperatures of 300 and 700°C, respectively., Smeša prahova α-Bi2O3 i HfO2 u molarnom odnosu 2:3 mehanohemijski je tretirana u planetarnom mlinu u atmosferi vazduha, koristeći cirkonijumske posude i kuglice kao medijum za mlevenje. Posle 50 h mlevenja, mehanohemijska reakcija dovodi do stvaranja nanokristalne δ-Bi2O3 faze (čvrsti rastvor fluoritske strukture Bi0,78Hf0,59Zr0,63O3,61), veličine kristalita 20 nm. Mehanohemijska reakcija otpočinje u samom početku mlevenja i praćena je akumulacijum ZrO2 koji potiče od medijuma za mlevenje. Uzorci dobijeni posle različitih vremena mlevenja karakterisani su rendgenskom strukturnom i termijskom analizom. Električna svojstva mlevenih i presovanih Bi0,78Hf0,59Zr0,63O3,61 prahova ispitivana su impedansnom spektroskopijom u temperaturnom opsegu od 100 do 700°C. Dobijena električna provodnost je 9,43·10-6 i 0,080 S cm-1 za temperaturu 300 i 700°C, redom.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2",
pages = "1401-1411",
volume = "74",
number = "12",
doi = "10.2298/JSC0912401Z",
url = "https://hdl.handle.net/21.15107/rcub_dais_174"
}

Zdujić, M., Poleti, D., Jovalekić, Č.,& Karanović, L.. (2009). Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 74(12), 1401-1411.
https://doi.org/10.2298/JSC0912401Z
https://hdl.handle.net/21.15107/rcub_dais_174

Zdujić M, Poleti D, Jovalekić Č, Karanović L. Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2. in Journal of the Serbian Chemical Society. 2009;74(12):1401-1411.
doi:10.2298/JSC0912401Z
https://hdl.handle.net/21.15107/rcub_dais_174 .

Zdujić, Miodrag, Poleti, Dejan, Jovalekić, Čedomir, Karanović, Ljiljana, "Mechanochemical synthesis and electrical conductivity of nanocrystalline δ-Bi2O3 stabilized by HfO2 and ZrO2" in Journal of the Serbian Chemical Society, 74, no. 12 (2009):1401-1411,
https://doi.org/10.2298/JSC0912401Z .,
https://hdl.handle.net/21.15107/rcub_dais_174 .

TY  - JOUR
AU  - Jovalekić, Čedomir
AU  - Zdujić, Miodrag
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
AU  - Mitrić, Miodrag
PY  - 2008
UR  - https://dais.sanu.ac.rs/123456789/3582
AB  - Powder mixtures of α-Bi2O3 (bismite) and monoclinic m-ZrO2 (baddeleyite) in the molar ratio 2:3 were mechanochemically and thermally treated with the goal to examine the phases, which may appear during such procedures. The prepared samples were characterized by X-ray powder diffraction, differential scanning calorimetry (DSC), electrical measurements, as well as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanochemical reaction leads to the gradual formation of a nanocrystalline phase, which resembles δ-Bi2O3, a high-temperature Bi2O3 polymorph. Isothermal sintering in air at a temperature of 820 °C for 24 h followed by quenching to room temperature yielded a mixture of ZrO2-stabilized β-Bi2O3 and m-ZrO2 phases, whereas in slowly cooled products, the complete separation of the initial α-Bi2O3 and m-ZrO2 constituents was observed. The dielectric permittivity of the sintered samples significantly depended on the temperature. The sintered and quenched samples exhibited a hysteresis dependence of the dielectric shift, showing that the ZrO2-doped β-Bi2O3 phase possess ferroelectric properties, which were detected for the first time. This fact, together with Rietveld refinement of the β-Bi2O3/m-ZrO2 mixture based on neutron powder diffraction data showed that ZrO2-doped β-Bi2O3 has a non-centrosymmetric structure with P over(4, -) 21 c as the true space group. The ZrO2 content in the doped β-Bi2O3 and the crystal chemical reasons for the stabilization of the β-Bi2O3 phase by the addition of m-ZrO2 are discussed. © 2008 Elsevier Inc. All rights reserved.
T2  - Journal of Solid State Chemistry
T1  - Structural and electrical properties of the 2Bi2O3·3ZrO2 system
SP  - 1321
EP  - 1329
VL  - 181
IS  - 6
DO  - 10.1016/j.jssc.2008.02.038
UR  - https://hdl.handle.net/21.15107/rcub_dais_3582
ER  - 

@article{
author = "Jovalekić, Čedomir and Zdujić, Miodrag and Poleti, Dejan and Karanović, Ljiljana and Mitrić, Miodrag",
year = "2008",
abstract = "Powder mixtures of α-Bi2O3 (bismite) and monoclinic m-ZrO2 (baddeleyite) in the molar ratio 2:3 were mechanochemically and thermally treated with the goal to examine the phases, which may appear during such procedures. The prepared samples were characterized by X-ray powder diffraction, differential scanning calorimetry (DSC), electrical measurements, as well as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanochemical reaction leads to the gradual formation of a nanocrystalline phase, which resembles δ-Bi2O3, a high-temperature Bi2O3 polymorph. Isothermal sintering in air at a temperature of 820 °C for 24 h followed by quenching to room temperature yielded a mixture of ZrO2-stabilized β-Bi2O3 and m-ZrO2 phases, whereas in slowly cooled products, the complete separation of the initial α-Bi2O3 and m-ZrO2 constituents was observed. The dielectric permittivity of the sintered samples significantly depended on the temperature. The sintered and quenched samples exhibited a hysteresis dependence of the dielectric shift, showing that the ZrO2-doped β-Bi2O3 phase possess ferroelectric properties, which were detected for the first time. This fact, together with Rietveld refinement of the β-Bi2O3/m-ZrO2 mixture based on neutron powder diffraction data showed that ZrO2-doped β-Bi2O3 has a non-centrosymmetric structure with P over(4, -) 21 c as the true space group. The ZrO2 content in the doped β-Bi2O3 and the crystal chemical reasons for the stabilization of the β-Bi2O3 phase by the addition of m-ZrO2 are discussed. © 2008 Elsevier Inc. All rights reserved.",
journal = "Journal of Solid State Chemistry",
title = "Structural and electrical properties of the 2Bi2O3·3ZrO2 system",
pages = "1321-1329",
volume = "181",
number = "6",
doi = "10.1016/j.jssc.2008.02.038",
url = "https://hdl.handle.net/21.15107/rcub_dais_3582"
}

Jovalekić, Č., Zdujić, M., Poleti, D., Karanović, L.,& Mitrić, M.. (2008). Structural and electrical properties of the 2Bi2O3·3ZrO2 system. in Journal of Solid State Chemistry, 181(6), 1321-1329.
https://doi.org/10.1016/j.jssc.2008.02.038
https://hdl.handle.net/21.15107/rcub_dais_3582

Jovalekić Č, Zdujić M, Poleti D, Karanović L, Mitrić M. Structural and electrical properties of the 2Bi2O3·3ZrO2 system. in Journal of Solid State Chemistry. 2008;181(6):1321-1329.
doi:10.1016/j.jssc.2008.02.038
https://hdl.handle.net/21.15107/rcub_dais_3582 .

Jovalekić, Čedomir, Zdujić, Miodrag, Poleti, Dejan, Karanović, Ljiljana, Mitrić, Miodrag, "Structural and electrical properties of the 2Bi2O3·3ZrO2 system" in Journal of Solid State Chemistry, 181, no. 6 (2008):1321-1329,
https://doi.org/10.1016/j.jssc.2008.02.038 .,
https://hdl.handle.net/21.15107/rcub_dais_3582 .

TY  - JOUR
AU  - Veljković, Ivana
AU  - Poleti, Dejan
AU  - Zdujić, Miodrag
AU  - Karanović, Ljiljana
AU  - Jovalekić, Čedomir
PY  - 2008
UR  - https://dais.sanu.ac.rs/123456789/3580
AB  - Nanocrystalline cubic titanium monoxide, TiOx (0.92 < x < 1.19), with mean crystallite size of ≈ 6 nm, was synthesized by mechanochemical treatment of Ti and TiO2 (rutile) powder mixtures with molar ratios of 1:1, 1.10:1 and 1.25:1. The mechanochemical solid state reaction in a high-energy planetary ball mill was completed for 2 h in either air or argon atmosphere. During heating in vacuum at 900 and 1000 °C for 24 h, nanocrystalline TiOx transforms to a well-crystallized, cubic or monoclinic TiOx. The materials prepared were characterized by XRPD, TGA/DSC and SEM/EDS analysis. © 2008 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Letters
T1  - Mechanochemical synthesis of nanocrystalline titanium monoxide
SP  - 2769
EP  - 2771
VL  - 62
IS  - 17-18
DO  - 10.1016/j.matlet.2008.01.039
UR  - https://hdl.handle.net/21.15107/rcub_dais_3580
ER  - 

@article{
author = "Veljković, Ivana and Poleti, Dejan and Zdujić, Miodrag and Karanović, Ljiljana and Jovalekić, Čedomir",
year = "2008",
abstract = "Nanocrystalline cubic titanium monoxide, TiOx (0.92 < x < 1.19), with mean crystallite size of ≈ 6 nm, was synthesized by mechanochemical treatment of Ti and TiO2 (rutile) powder mixtures with molar ratios of 1:1, 1.10:1 and 1.25:1. The mechanochemical solid state reaction in a high-energy planetary ball mill was completed for 2 h in either air or argon atmosphere. During heating in vacuum at 900 and 1000 °C for 24 h, nanocrystalline TiOx transforms to a well-crystallized, cubic or monoclinic TiOx. The materials prepared were characterized by XRPD, TGA/DSC and SEM/EDS analysis. © 2008 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Letters",
title = "Mechanochemical synthesis of nanocrystalline titanium monoxide",
pages = "2769-2771",
volume = "62",
number = "17-18",
doi = "10.1016/j.matlet.2008.01.039",
url = "https://hdl.handle.net/21.15107/rcub_dais_3580"
}

Veljković, I., Poleti, D., Zdujić, M., Karanović, L.,& Jovalekić, Č.. (2008). Mechanochemical synthesis of nanocrystalline titanium monoxide. in Materials Letters
Elsevier., 62(17-18), 2769-2771.
https://doi.org/10.1016/j.matlet.2008.01.039
https://hdl.handle.net/21.15107/rcub_dais_3580

Veljković I, Poleti D, Zdujić M, Karanović L, Jovalekić Č. Mechanochemical synthesis of nanocrystalline titanium monoxide. in Materials Letters. 2008;62(17-18):2769-2771.
doi:10.1016/j.matlet.2008.01.039
https://hdl.handle.net/21.15107/rcub_dais_3580 .

Veljković, Ivana, Poleti, Dejan, Zdujić, Miodrag, Karanović, Ljiljana, Jovalekić, Čedomir, "Mechanochemical synthesis of nanocrystalline titanium monoxide" in Materials Letters, 62, no. 17-18 (2008):2769-2771,
https://doi.org/10.1016/j.matlet.2008.01.039 .,
https://hdl.handle.net/21.15107/rcub_dais_3580 .

TY  - CONF
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Veljković, Ivana
AU  - Poleti, Dejan
AU  - Karanović, Ljiljana
PY  - 2008
UR  - https://dais.sanu.ac.rs/123456789/302
AB  - Poster presented at the XLVI Savetovanje srpskog hemijskog društva, Beograd, 29. mart (21. februar) 2008
T1  - Uticaj parametara mlevenja na odnos amorfne i kristalne faze u jedinjenju Bi4Ti3O12
UR  - https://hdl.handle.net/21.15107/rcub_dais_302
ER  - 

@conference{
author = "Zdujić, Miodrag and Jovalekić, Čedomir and Veljković, Ivana and Poleti, Dejan and Karanović, Ljiljana",
year = "2008",
abstract = "Poster presented at the XLVI Savetovanje srpskog hemijskog društva, Beograd, 29. mart (21. februar) 2008",
title = "Uticaj parametara mlevenja na odnos amorfne i kristalne faze u jedinjenju Bi4Ti3O12",
url = "https://hdl.handle.net/21.15107/rcub_dais_302"
}

Zdujić, M., Jovalekić, Č., Veljković, I., Poleti, D.,& Karanović, L.. (2008). Uticaj parametara mlevenja na odnos amorfne i kristalne faze u jedinjenju Bi4Ti3O12. .
https://hdl.handle.net/21.15107/rcub_dais_302

Zdujić M, Jovalekić Č, Veljković I, Poleti D, Karanović L. Uticaj parametara mlevenja na odnos amorfne i kristalne faze u jedinjenju Bi4Ti3O12. 2008;.
https://hdl.handle.net/21.15107/rcub_dais_302 .

Zdujić, Miodrag, Jovalekić, Čedomir, Veljković, Ivana, Poleti, Dejan, Karanović, Ljiljana, "Uticaj parametara mlevenja na odnos amorfne i kristalne faze u jedinjenju Bi4Ti3O12" (2008),
https://hdl.handle.net/21.15107/rcub_dais_302 .