In this article the influence of ball miling process on structure of MgO-TiO2 system was investigated. The mixtures of MgO-TiO2 powders were mechanically activated in a planetary ball mill for the time period from 0 to 120 minutes. The influence of mechanical activation on the lattice vibrational spectra was studied by Raman spectroscopy at room temperature. Structural investigations have been performed on produced powders. Nitrogen adsorption method was used to determine the BET specific surface area and pore size distribution. Unusual results have been obtained: specific surface area continuously decreased up to 40 minutes of activation and increased after that, reaching its minimun value of 5.5 m2/g. The Raman spectra of activated powders have shown that anatase modes have been decreasing in intensity and broadening as the time of activation extended. Also, the additional modes attributed to TiO2 II, srilankite and rutile phases started to appear as a consequence of activation

Filipović, Suzana

Obradović, Nina

Pavlović, Vladimir B.

Ristić, Momčilo

Šćepanović, M.

Ristić, Momčilo M.

Serbian Academy of Science and Arts Digital Archive (DAIS)

   Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION II New Frontiers in Multifunctional Material Science and Processing                 Serbian Ceramic Society Institute of Chemistry Technology and Metallurgy Institute for Technology of Nuclear and Other Raw Mineral Materials Institute for Testing of Materials  Archeological Institute of SASA  PROGRAM AND THE BOOK OF ABSTRACTS                         Serbian Academy of Sciences and Arts, Knez Mihailova 35 Sep 30th - Oct 1st, 2013, Belgrade, Serbia     Book title: Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION II: Program and the Book of Abstracts   Publisher: Serbian Ceramic Society  Editors: Prof.dr Voja Mitić Dr Nina Obradovic Dr Lidija Mančić  Technical Editor: Dr Lidija Mačić  Printing:  Serbian Academy of Sciences and Arts,  Knez Mihailova 35, Belgrade Format Pop Lukina 15, Belgrade   Edition:  100 copies  Mosaics: Original Format 30x40 cm Mirjana Milić, Vladimir Skerlić, Maja Opačić, Maša Nicić, Nina Nicić, Milica Konstantinović, Marjan Vesić - Academy od SOC for Fine Arts and Conservation  CIP - Каталогизација у публикацији Народна библиотека Србије, Београд  666.3/.7(048) 66.017/.018(048)  SERBIAN Ceramic Society. Conference (2 ;    2013 ; Beograd)    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, Serbia ; organized by Serbian Ceramic Society... [et al.] ;  [editors Vojislav Mitić, Nina Obradović, Lidija Mančić]. - Belgrade : Serbian Ceramic Society, 2013 (Belgrade : Serbian Academy of Sciences and Arts). - XVI, 61 str. ; 30 cm  Tiraž 100.  ISBN 978-86-915627-1-7 1. Serbian Ceramic Society (Beograd) a) Керамика - Апстракти b) Наука о  материјалима - Апстракти  c) Наноматеријали - Апстракти COBISS.SR-ID 201203212     The Serbian Ceramic Society Conference »Advanced Ceramics and Application II« Sep 30-Oct 1, 2013, Serbian Academy of Sciences and Arts, Knez Mihailova 35, Belgrade, Serbia   40  P14 Influence of MoO3 on sintering temperature of mechanically  activated MgO-Al2O3-SiO2 system  N. Đorđević1, N. Obradović2, A. Radosavljević-Mihajlović3, B. Jokić4, S. Filipović2, M. Mitrić3, S. Marković2   1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 2Institute of Technical Sciences of SASA, Knez Mihailova 35/IV, Belgrade, Serbia 3Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia 4University of Belgrade, Faculty of Technology and Metallurgy, Belgrade    Cordierite, 2MgO⋅2Al2O3⋅5SiO2, is a very attractive high-temperature ceramic material, due to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low dielectric constant and good mechanical properties. In order to accelerate the process of sintering, 5.00 mass% MoO3 has been added to the starting mixtures. The mechanical activation of the starting mixtures was performed in a high energy ball mill during 0-80 minutes. The particle size analysis (PSA) was employed in order to determine the changes in the particle size of the mechanically treated powders. The phase composition of the starting powders and sintered samples was analyzed by the X-ray diffraction method. Furthermore, differential thermal analysis (DTA) was used in order to determine characteristic temperatures within the system during heating. Based on the obtained DTA results, it was established that mechanical activation has some influence on temperatures of phase transitions. Sintering process was performed in air at 1200oC for 2h.    P15 Structural characterization of mechanically activated MgO-TiO2 system  S. Filipović1, N. Obradović1, J. Krstić2, M. Šćepanović3, V. Pavlović1 and M. M. Ristić4  1Institute of Technical Sciences-SASA, Knez Mihajlova 35/IV, 11000 Belgrade, Serbia 2University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering, Njegoševa 12, 11000 Belgrade, Serbia 3Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia 4Serbian Academy of Sciences and Arts, Knez Mihajlova 35, 11000 Belgrade, Serbia    In this article the influence of ball miling process on structure of MgO-TiO2 system was investigated. The mixtures of MgO-TiO2 powders were mechanically activated in a planetary ball mill for the time period from 0 to 120 minutes. The influence of mechanical activation on the lattice vibrational spectra was studied by Raman spectroscopy at room temperature. Structural investigations have been performed on produced powders. Nitrogen adsorption method was used to determine the BET specific surface area and pore size distribution. Unusual results have been obtained: specific surface area continuosly decreased up to 40 minutes of activation and increased after that, reaching its minimun value of 5.5 m2/g. The Raman spectra of activated powders have shown that anatase modes have been decreasing in intensity and broadening as the time of The Serbian Ceramic Society Conference »Advanced Ceramics and Application II« Sep 30-Oct 1, 2013, Serbian Academy of Sciences and Arts, Knez Mihailova 35, Belgrade, Serbia   41  activation extended. Also, the additional modes attributed to TiO2 II, srilankite and rutile phases started to appear as a consequence of activation.     P16 Annealing and doping concentration effects of Y2O3: Sm3+nanopowder obtained by self-propagation room temperature reaction  Sanja Ćulibrk, Vesna Lojpur, Vesna Đordjević and Miroslav D.Dramićanin  Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Belgrade, Serbia  In this report, structure, morphology and luminescence of Y2O3:Sm3+nanoparticles prepared by self-propagating room temperature reaction are presented. This new, simple and cost effective synthesis allows obtaining desired phase composition by mixing appropriate amounts of yttrium and samarium nitrates together with sodium hydroxide. A set of samples is prepared with different Sm3+concentrations (0.1, 0.2, 0.5, 1 and 2 at %) in order to observe changes of luminescence properties. Also, effects of post synthesis annealing at several temperatures (600 °C, 800 °C and 1100 °C) are analyzed. For all samples X-ray diffraction showed that powders have cubic bixbyite structure (Ia-3), and TEM analysis showed particles of about 50 nm. Luminescence emission spectra clearly show peaks characteristic for electronic spin-forbidden transition of Sm3+ ions 4G5/2→6H5/2, 6H7/2 and 6H9/2 centered at 578, 607 and 654 nm, respectively. Emission lifetime values decrease with Sm3+ ion concentration increments, from 1.94ms for 0.1 at% to 0.97 ms for 2 at%. In addition, enlargement of lifetime values observed when thermal treatment is done at the highest temperature due to the elimination of luminescence quenching species from the surface of particles.     P17 Effect of processing parameters on structural and morphological   Y2O3 :Yb3+/Ho3+  powders characteristics  V. Lojpur1, L. Mancic2, B.A. Marinkovic3, M.D. Dramicanin1, O. Milosevic2  1Vinca Institute of Nuclear Science, University of Belgrade, P.O. Box 522, Belgrade, Serbia 2Institute of Technical Sciences of SASA, K. Mihailova 35/IV, Belgrade, Serbia 3 Departamento de Engenharia de Materiais, PUC-Rio, Rio de Janeiro, RJ, Brazil   Up-converting yttrium oxide powders doped with Yb3+ and co-doped with Ho3+ were synthesized through hydrothermal processing at 200 °C/3 h. Reverse precipitation of the starting nitrates mixture is performed with the help of ammonium hydrogen carbonate (AHC) solution up to pH 7 or pH 9 prior to hydrothermal treatment. Morphological features of the as-prepared (asp) powders and rare earth oxides obtained after powders additional annealing at 1100 oC (3 and 12 h) are discussed based on X-ray powder diffractometry (XRPD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Structural refinement confirmed generation of the cubic bixbyte-structure (S.G. Ia-3) with non-uniform accomodation of dopants at C2 and S6 cationic sites. SEM revealed that the particles have plate-like or rod-like morphology in dependence of hydrothermal processing (pH). Due to the fact that are composed from nanograins (30-100 nm) they 

English

Structural characterization of mechanically activated MgO-TiO2 system

Digital Repository of the Institute of Technical Sciences of SASA

 
 
 
Serbian Ceramic Society Conference 
ADVANCED CERAMICS AND APPLICATION II 
New Frontiers in Multifunctional Material Science and Processing 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Serbian Ceramic Society 
Institute of Chemistry Technology and Metallurgy 
Institute for Technology of Nuclear and Other Raw Mineral Materials 
Institute for Testing of Materials 
 Archeological Institute of SASA 
 
PROGRAM AND THE BOOK OF ABSTRACTS 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Serbian Academy of Sciences and Arts, Knez Mihailova 35 
Sep 30th - Oct 1st, 2013, Belgrade, Serbia 
 
 
 
 
Book title: Serbian Ceramic Society Conference - ADVANCED CERAMICS AND 
APPLICATION II: Program and the Book of Abstracts  
 
Publisher: 
Serbian Ceramic Society 
 
Editors: 
Prof.dr Voja Mitić 
Dr Nina Obradovic 
Dr Lidija Mančić 
 
Technical Editor: 
Dr Lidija Mačić 
 
Printing:  
Serbian Academy of Sciences and Arts,  
Knez Mihailova 35, Belgrade 
Format 
Pop Lukina 15, Belgrade  
 
Edition:  
100 copies 
 
Mosaics: Original Format 30x40 cm 
Mirjana Milić, Vladimir Skerlić, Maja Opačić, Maša Nicić, Nina Nicić, Milica Konstantinović, 
Marjan Vesić - Academy od SOC for Fine Arts and Conservation 
 
CIP - Каталогизација у публикацији 
Народна библиотека Србије, Београд 
 
666.3/.7(048) 
66.017/.018(048) 
 
SERBIAN Ceramic Society. Conference (2 ;    2013 ; Beograd) 
   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, Serbia ; organized by Serbian Ceramic Society... [et al.] ;  
[editors Vojislav Mitić, Nina Obradović, Lidija Mančić]. - Belgrade : Serbian Ceramic Society, 
2013 (Belgrade : Serbian Academy of Sciences and Arts). - XVI, 61 str. ; 30 cm 
 
Tiraž 100. 
 
ISBN 978-86-915627-1-7 
1. Serbian Ceramic Society (Beograd) 
a) Керамика - Апстракти b) Наука о  материјалима - Апстракти  
c) Наноматеријали - Апстракти 
COBISS.SR-ID 201203212 
 
 
 
 
The Serbian Ceramic Society Conference »Advanced Ceramics and Application II« 
Sep 30-Oct 1, 2013, Serbian Academy of Sciences and Arts, Knez Mihailova 35, Belgrade, Serbia 
 
 
40  
P14 
Influence of MoO3 on sintering temperature of mechanically  
activated MgO-Al2O3-SiO2 system 
 
N. Đorđević1, N. Obradović2, A. Radosavljević-Mihajlović3, B. Jokić4, S. Filipović2, M. Mitrić3, S. 
Marković2  
 
1Institute for Technology of Nuclear and Other Mineral Raw Materials, Belgrade, Serbia 
2Institute of Technical Sciences of SASA, Knez Mihailova 35/IV, Belgrade, Serbia 
3Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia 
4University of Belgrade, Faculty of Technology and Metallurgy, Belgrade  
 
 Cordierite, 2MgO⋅2Al2O3⋅5SiO2, is a very attractive high-temperature ceramic material, due 
to its outstanding electrical characteristics, such as the low temperature expansion coefficient, low 
dielectric constant and good mechanical properties. In order to accelerate the process of sintering, 
5.00 mass% MoO3 has been added to the starting mixtures. The mechanical activation of the 
starting mixtures was performed in a high energy ball mill during 0-80 minutes. The particle size 
analysis (PSA) was employed in order to determine the changes in the particle size of the 
mechanically treated powders. The phase composition of the starting powders and sintered samples 
was analyzed by the X-ray diffraction method. Furthermore, differential thermal analysis (DTA) 
was used in order to determine characteristic temperatures within the system during heating. Based 
on the obtained DTA results, it was established that mechanical activation has some influence on 
temperatures of phase transitions. Sintering process was performed in air at 1200oC for 2h. 
 
 
 
P15 
Structural characterization of mechanically activated MgO-TiO2 system 
 
S. Filipović1, N. Obradović1, J. Krstić2, M. Šćepanović3, V. Pavlović1 and M. M. Ristić4 
 
1Institute of Technical Sciences-SASA, Knez Mihajlova 35/IV, 11000 Belgrade, Serbia 
2University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of 
Catalysis and Chemical Engineering, Njegoševa 12, 11000 Belgrade, Serbia 
3Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia 
4Serbian Academy of Sciences and Arts, Knez Mihajlova 35, 11000 Belgrade, Serbia 
 
  In this article the influence of ball miling process on structure of MgO-TiO2 system was 
investigated. The mixtures of MgO-TiO2 powders were mechanically activated in a planetary ball 
mill for the time period from 0 to 120 minutes. The influence of mechanical activation on the lattice 
vibrational spectra was studied by Raman spectroscopy at room temperature. Structural 
investigations have been performed on produced powders. Nitrogen adsorption method was used to 
determine the BET specific surface area and pore size distribution. Unusual results have been 
obtained: specific surface area continuosly decreased up to 40 minutes of activation and increased 
after that, reaching its minimun value of 5.5 m2/g. The Raman spectra of activated powders have 
shown that anatase modes have been decreasing in intensity and broadening as the time of 
The Serbian Ceramic Society Conference »Advanced Ceramics and Application II« 
Sep 30-Oct 1, 2013, Serbian Academy of Sciences and Arts, Knez Mihailova 35, Belgrade, Serbia 
 
 
41  
activation extended. Also, the additional modes attributed to TiO2 II, srilankite and rutile phases 
started to appear as a consequence of activation.  
 
 
 
P16 
Annealing and doping concentration effects of Y2O3: Sm3+nanopowder obtained 
by self-propagation room temperature reaction 
 
Sanja Ćulibrk, Vesna Lojpur, Vesna Đordjević and Miroslav D.Dramićanin 
 
Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Belgrade, Serbia 
 
In this report, structure, morphology and luminescence of Y2O3:Sm3+nanoparticles prepared 
by self-propagating room temperature reaction are presented. This new, simple and cost effective 
synthesis allows obtaining desired phase composition by mixing appropriate amounts of yttrium 
and samarium nitrates together with sodium hydroxide. A set of samples is prepared with different 
Sm3+concentrations (0.1, 0.2, 0.5, 1 and 2 at %) in order to observe changes of luminescence 
properties. Also, effects of post synthesis annealing at several temperatures (600 °C, 800 °C and 
1100 °C) are analyzed. For all samples X-ray diffraction showed that powders have cubic bixbyite 
structure (Ia-3), and TEM analysis showed particles of about 50 nm. Luminescence emission 
spectra clearly show peaks characteristic for electronic spin-forbidden transition of Sm3+ ions 
4G5/2→6H5/2, 6H7/2 and 6H9/2 centered at 578, 607 and 654 nm, respectively. Emission lifetime values 
decrease with Sm3+ ion concentration increments, from 1.94ms for 0.1 at% to 0.97 ms for 2 at%. In 
addition, enlargement of lifetime values observed when thermal treatment is done at the highest 
temperature due to the elimination of luminescence quenching species from the surface of particles.  
 
 
 
P17 
Effect of processing parameters on structural and morphological   
Y2O3 :Yb3+/Ho3+  powders characteristics 
 
V. Lojpur1, L. Mancic2, B.A. Marinkovic3, M.D. Dramicanin1, O. Milosevic2 
 
1Vinca Institute of Nuclear Science, University of Belgrade, P.O. Box 522, Belgrade, Serbia 
2Institute of Technical Sciences of SASA, K. Mihailova 35/IV, Belgrade, Serbia 
3 Departamento de Engenharia de Materiais, PUC-Rio, Rio de Janeiro, RJ, Brazil 
 
 Up-converting yttrium oxide powders doped with Yb3+ and co-doped with Ho3+ were 
synthesized through hydrothermal processing at 200 °C/3 h. Reverse precipitation of the starting 
nitrates mixture is performed with the help of ammonium hydrogen carbonate (AHC) solution up to 
pH 7 or pH 9 prior to hydrothermal treatment. Morphological features of the as-prepared (asp) 
powders and rare earth oxides obtained after powders additional annealing at 1100 oC (3 and 12 h) 
are discussed based on X-ray powder diffractometry (XRPD), scanning electron microscopy (SEM) 
and energy dispersive spectroscopy (EDS). Structural refinement confirmed generation of the cubic 
bixbyte-structure (S.G. Ia-3) with non-uniform accomodation of dopants at C2 and S6 cationic sites. 
SEM revealed that the particles have plate-like or rod-like morphology in dependence of 
hydrothermal processing (pH). Due to the fact that are composed from nanograins (30-100 nm) they 


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