Ceramics-Silikáty 57, (3) 215 - 218 (2013) |
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THE EFFECT OF DIFFERENT POLYMORPHS TiO2 RAW MATERIALS ON THE DIELECTRIC PROPERTIES AND MICROSTRUCTURE IN CaCu3Ti4O12 CERAMICS
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Hao Wentao 1,2, Xu Panpan 3, Wang Xiaomin 4,
Cao Ensi 2,1,
Peng Hua 2,1,
Zhang Jialiang 3
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1 Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education,
Taiyuan University of Technology, Taiyuan 030024, P. R. China
2 College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, P. R. China
3 School of Physics, Shandong University, Jinan 250100, P. R. China
4 Yangzi middle School, Weifang 261000, P. R. China
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Keywords: CaCu3Ti4O12 ceramics, Different polymorphs TiO2 raw materials, Dielectric properties, Microstructure
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CaCu3Ti4O12 ceramics with different polymorphs of TiO2 as starting materials were prepared by the conventional solid-state
reaction technique. Their crystalline structure, microstructure and dielectric properties were systematically investigated.
It has been found that all of the ceramic specimens prepared in the present study have a good polycrystalline structure,
and no secondary phase is been found by XRD. However, large differences in dielectric properties and microstructure are
observed in them: 1) the characteristic frequency of dielectric relaxation around 1 MHz in the CCTO ceramics prepared
with rutile TiO2 is much lower than that in those ceramics prepared with anatase TiO2; 2) no matter dielectric properties
or microstructure, the CCTO ceramics prepared with rutile TiO2 are more sensitive to the sintering temperature than those
ceramics prepared with anatase TiO2. |
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