Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 27, Pages 7416-7420Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.04.052
Keywords
CaCu3Ti4O12; Dielectric properties; Composites; Non-ohmic properties
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Funding
- National Research University of Thailand, Office of the Higher Education Commission
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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). epsilon' (tan delta) 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 degrees C for 10 h exhibits the high epsilon' of 2530 with weak frequency dependence below 1 MHz, the low tan delta less than 0.05 in the frequency range of 160 Hz-177 kHz, and the little temperature coefficient, i.e., vertical bar Delta epsilon'vertical bar <= 15% in the temperature range from -55 to 85 degrees C. These results indicate that the CaCu3Ti4O12/CaTiO3 composite system prepared by PP method is a promising high-epsilon' material for practical capacitor application. (C) 2011 Elsevier B.V. All rights reserved.
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