Effects of CuO on the Preparation, Microstructure and Dielectric Response of CaCu3Ti4O12
CaCu3Ti4O12 (CCTO) barrier layer ceramic capacitor was prepared by a two-step sintering process. The CCTO powders were pre-synthesized at 900oC by solid-state reaction and the effects of the amount of CuO on the formation of the CCTO powders were investigated. The CCTO ceramics were prepared by the second-step sintering. It was found that the abnormal grain growth and inhomogeneous microstructure are controlled by the amount of excessive CuO. The optimized CuO content in the composites is ~14 wt%. The maximum permittivity is 115,000 (1 kHz, 210oC).
Wei Pan and Jianghong Gong
J. F. Qiao et al., "Effects of CuO on the Preparation, Microstructure and Dielectric Response of CaCu3Ti4O12", Key Engineering Materials, Vols. 368-372, pp. 121-122, 2008