Improved dielectric and non-ohmic properties of Ca2Cu2Ti4O12 ceramics prepared by a polymer pyrolysis method |
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Authors: | Prasit Thongbai Bundit PutasaengTeerapon Yamwong Santi Maensiri |
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Affiliation: | a Integrated Nanotechnology Research Center (INRC), Department of Physics, Khon Kaen University, Khon Kaen, 40002, Thailand b National Metals and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, 12120, Thailand c School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand |
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Abstract: | Non-ohmic and dielectric properties of Ca2Cu2Ti4O12 (CaCu3Ti4O12/CaTiO3 composite) ceramics prepared by a polymer pyrolysis method (PP-ceramic samples) are investigated. The PP-ceramics show a highly dense structure and improved non-ohmic and dielectric properties compared to the ceramics obtained by a solid state reaction method (SSR-ceramic samples). ?′ (tan δ) of the PP-ceramic samples is found to be higher (lower) than that of the SSR-ceramic samples. Interestingly, the PP-ceramic sintered at 1050 °C for 10 h exhibits the high ?′ of 2530 with weak frequency dependence below 1 MHz, the low tan δ less than 0.05 in the frequency range of 160 Hz-177 kHz, and the little temperature coefficient, i.e., |Δ?′| ≤ 15 % in the temperature range from −55 to 85 °C. These results indicate that the CaCu3Ti4O12/CaTiO3 composite system prepared by PP method is a promising high-?′ material for practical capacitor application. |
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Keywords: | CaCu3Ti4O12 Dielectric properties Composites Non-ohmic properties |
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