论文信息 - Effects of CuO on the Preparation, Microstructure and Dielectric Response of CaCu3Ti4O12

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).

Rui Zhang | Hai Long Wang | Li Guan | D. Qin | J. Qiao

[1] K. Varma,et al. Effect of sintering conditions on the dielectric properties of CaCu3Ti4O12 and La2/3Cu3Ti4O12 ceramics : A comparative study , 2006 .

[2] T. Fang,et al. Effects of Cu stoichiometry on the microstructures, barrier-layer structures, electrical conduction, dielectric responses, and stability of CaCu3Ti4O12 , 2006 .

[3] S. K. Pradhan,et al. Microstructure characterization of ball-mill-prepared nanocrystalline CaCu3Ti4O12 by Rietveld method , 2006 .

[4] M. Pan,et al. The effect of processing on the giant dielectric properties of CaCu3Ti4O12 , 2005 .

[5] D. Capsoni,et al. Role of doping and CuO segregation in improving the giant permittivity of CaCu3Ti4O12 , 2004 .

[6] M. Shen,et al. Deposition and dielectric properties of CaCu3Ti4O12 thin films on Pt/Ti/ SiO2/Si substrates using pulsed-laser deposition , 2003 .

[7] P. Gehring,et al. Neutron scattering study of antiferromagnetic order in CaCu3Ti4O12 , 2002 .

[8] Margaret L. Gardel,et al. Giant dielectric constant response in a copper-titanate , 2000 .

[9] Arthur W. Sleight,et al. High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases , 2000 .

[10] Cheng-Fu Yang. Improvement of the sintering and dielectric characteristics of surface barrier layer capacitors by CuO addition , 1996 .

[11] Thierry Lebey,et al. Dielectric properties of CaCu 3Ti 4O 12 based multiphased ceramics , 2006 .