Dielectric properties of Li-doped CaCu3Ti4O12 Ceramics
CaCu3Ti4O12 ceramics doped with 0-2.0 wt％ Li2CO3 were prepared by the solid-state reaction, and their electric and dielectric properties were investigated. It is found that these ceramics had the properties of high dielectric constant and comparatively low dielectric loss. At the doping amount of 0.5 wt％, the dielectric constant is kept to be 105 with weak frequency dependence below 105 Hz, and its loss tangent (tan δ) is suppressed below 0.1 between 300 Hz-5 kHz (with the minimum value of 0.06 at 1 kHz from 218 K to 338 K). The impedance spectroscopy analysis confirms that the decrease of dielectric loss is mainly due to the increase of resistance in the grain boundary, which may be related to the influence of Ti4O7 secondary phase. Our result indicates that doping Li2CO3 is an efficient method to optimize the dielectric properties of CaCu3Ti4O12.
Ceramics Dielectrics Doping
Ying He Huaiwu Zhang Yuanxun Li Weiwei Ling Yunyan Wang Peng Liu
The Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Sciencea College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, China
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
251-256
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）