Colossal breakdown electric field and dielectric response of Al-doped CaCu3Ti4O12 ceramics

被引：66

作者：

Jia, Ran ^{[1
]}

Zhao, Xuetong ^{[1
,2
]}

Li, Jianying ^{[1
]}

Tang, Xian ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Peoples R China

[2] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Chongqing 400044, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2014年 / 185卷

关键词：

CaCu3Ti4O12; CuAl2O4; Dielectric properties; Grain boundary; Dimensional effect; CONSTANT; RELAXATION; BEHAVIOR; PHASE;

D O I：

10.1016/j.mseb.2014.02.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A greatly enhanced breakdown electric field of similar to 21 kV/cm was achieved by liquid-phase doping of Al2O3 in CaCu3Ti4O12 (COD) ceramics. It was found that the dielectric loss of CCTO ceramics was composed of two dielectric relaxation peaks and dc conduction. Impedance analysis showed that the grain boundary resistance was increased from 0.37 M Omega to 13.55 M Omega and the corresponding activation energy of grain boundary was elevated from 0.63 eV to 0.81 eV. The frequency dependence of the conductivity was interpreted with the Jonscher's law, which indicated that the contribution of dc-like conduction at low frequency was effectively suppressed by Al2O3 doping. In addition, dimensional effect of the CCTO ceramics was found and an inflection (or critical) point behavior can be observed for pure and Al-doped samples, which referred to the variation of the breakdown electric field with the thickness of the samples. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：79 / 85

页数：7

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