ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 57, (3) 215 - 218 (2013)


THE EFFECT OF DIFFERENT POLYMORPHS TiO2 RAW MATERIALS ON THE DIELECTRIC PROPERTIES AND MICROSTRUCTURE IN CaCu3Ti4O12 CERAMICS
 
Hao Wentao 1,2, Xu Panpan 3, Wang Xiaomin 4, Cao Ensi 2,1, Peng Hua 2,1, Zhang Jialiang 3
 
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

Keywords: CaCu3Ti4O12 ceramics, Different polymorphs TiO2 raw materials, Dielectric properties, Microstructure
 

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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