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Projects / Programmes source: ARIS

High Temperature Phase Equilibria, Sintering and Microstructure Development in Multicomponent Ceramic Systems

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Research activity

Code Science Field Subfield
1.04.03  Natural sciences and mathematics  Chemistry  Inorganic chemistry 

Code Science Field
T153  Technological sciences  Ceramic materials and powders 
P250  Natural sciences and mathematics  Condensed matter: structure, thermal and mechanical properties, crystallography, phase equilibria 
Keywords
Phase equilibria. System BaO-TiO2-La2O3. System BaO-TiO2-CeO2-Ce2O3. Abnormal grain growth. Kinetics. Computer simulation. Liquid phase sintering. Hexagonal barium titanate. Defect perovskites. High temperature chemistry.
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (13)
no. Code Name and surname Research area Role Period No. of publications
1.  06627  PhD Slavko Bernik  Materials science and technology  Researcher  1996 - 2001  621 
2.  00842  PhD Ljubo Golič  Chemistry  Researcher  1996 - 2001  364 
3.  19241  PhD Jyoti Prosad Guha  Materials science and technology  Researcher  1999 - 2001  14 
4.  00066  PhD Dragomir Kolar  Systems and cybernetics  Head  2000 - 2001  729 
5.  10808  PhD Uroš Kunaver  Chemistry  Researcher  1998 - 2001  49 
6.  10372  PhD Darko Makovec  Materials science and technology  Researcher  1998 - 2001  667 
7.  15599  Tomislav Pustotnik    Researcher  1998 - 2001  8 
8.  10570  PhD Boris Saje  Materials science and technology  Researcher  1998 - 2001  87 
9.  08012  PhD Danilo Suvorov  Materials science and technology  Researcher  2000 - 2001  1,050 
10.  11093  PhD Srečo Davor Škapin  Chemistry  Researcher  1998 - 2001  590 
11.  15714  Borut Vičič    Researcher  1996 - 2001  5 
12.  04295  Jarmila Wernig    Researcher  1998 - 2001  2 
13.  07475  Silvo Zupančič    Researcher  1996 - 2001  17 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,753 
Abstract
Ceramics based on the ternary BaO-TiO2-R2O3 systems (R = rare earth, mostly La and Nd) are extensively used for manufacturing passive electronic components. Of particular interest are compositions in the vicinity of BaTiO3 which are used for preparation of (1) semiconductive electronic components with large positive temperature coefficient (PTCR), (2) highly temperature stable ceramic capacitors (''''NPO'''' type) and (3) high permitivitty microwave resonators.The electrical properties of ceramics strongly depend on their crystal structure, stoichiometry, grain size and phase composition. Microstructure, which develops during the sintering operation, depends above all on chemical reactions which ocurr at high temperatures. The aim of the project is to corrleate the phase equilibrium data and processing parameters (temperature and time) with electrical properties of ceramics. To achieve this goal, ternary systems must be determined and processing parameters optimised. The main issues will be, beside determination of phase equilibria in the systems BaO-TiO2-R2O3 (R = Ce, La, Nd), determination of kinetics and mechanism of densification and microstructure development. Electrical properties of optimised ceramics will be examined. It is expected that the results will contribute to the better knowledge of important phenomena in the fields of solid state chemistry and ceramics. At the same time, the results will be of interest for the manufacturers of ceramic electronic components. Results, achieved in 1998, were presented to professionals in publications, listed in bibliography of project leader and coworkers.
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