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DOI Prefix 10.20431 |
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International Journal of Advanced Research in Chemical Science
Volume-1 Issue-2, 2014, Page No:4-10
Dielectric Properties of Calcium Copper Titanates (CaCu3Ti4O12) Synthesized by Solid State Reaction
Omar A.A. Abdelal, Ahmed A. Hassan and M. El-Sayed Ali
Metallurgy Dept., NRC, Atomic Energy Authority, Cairo, Egypt.
Citation : Omar A.A. Abdelal, Ahmed A. Hassan and M. El-Sayed Ali, Dielectric Properties of Calcium Copper Titanates (CaCu3Ti4O12) Synthesized by Solid State Reaction International Journal of Advanced Research in Chemical Science. 2014;1(2):4-10.
Abstract
The conventional solid-state reaction technique was used to obtain CaCu3Ti4O12 (CCTO) Ceramics. The crystal structure, microstructure and dielectric properties of polycrystalline CCTO samples sintered at different temperatures were investigated. X-ray diffraction (XRD) patterns showed no change in crystal structure phase of samples sintered at different temperatures. The SEM showed normal grain growth in CCTO samples sintered at 1090 °C, while abnormal grain growth was observed in samples sintered at 1140°C. The chemical composition of the calcined powder determined by EDS corresponds to CaCu3Ti4O12. Dielectric constant of CCTO ceramic sintered at 1090 °C showed weak frequency dependence in the range of 100 Hz to 1 MHz, and gave a value of 104 measured at room temperature and 100 Hz. While the samples sintered at 1140°C showed significant frequency dependence and gave a value of 105. The dielectric loss was about 0.3 for the sample sintered at 1090 °C while it was close to 1 for the sample sintered at 1140 °C.
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