Conductivity-permittivity relations in oxygen deficient CaCu3Ti4O12

被引：7

作者：

Luo, X. J. ^{[1
]}

Baerner, K. ^{[2
]}

Zhang, Y. T. ^{[1
]}

Gao, T. ^{[1
]}

Yang, C. P. ^{[3
]}

Liu, Y. S. ^{[1
]}

机构：

[1] Shanghai Univ Elect Power, Coll Math & Phys, Shanghai 200090, Peoples R China

[2] Univ Gottingen, F Hund Pl 1, D-37077 Gottingen, Germany

[3] Hubei Univ, Fac Phys & Elect Technol, Wuhan 430062, Hubei, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Conductivity-permittivity relation; Oxygen vacancy; CaCu3Ti4O12; Defect dipole; GIANT DIELECTRIC-CONSTANT; SINTERING ATMOSPHERE; HIGH-FREQUENCY; CERAMICS; BEHAVIOR;

D O I：

10.1016/j.ceramint.2018.03.169

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The correlation between conductance, capacitance and oxygen content is discussed in the colossal dielectric permittivity perovskite oxide CaCu3Ti4O12. We found an unusual positive conductivity-permittivity relation which is very sensitive to the oxygen content. In particular, we ascribe the oxygen content sensitivity of both the capacitance and the conductance to a repositioning of charges on oxygen vacancy related defects and/or on the migration of the defects themselves. We find that in the charge repositioning process a Jonscher type of global conduction is accompanied by a Debye-type local electronic relaxation in and between the boundaries of a specific grain. A closer investigation of these processes suggest that the local polaronic relaxation of charges on oxygen vacancy related defects is mainly responsible for the large dielectric constant of CaCu3Ti4O12 and also for the ac conduction at low to medium temperatures.

引用

页码：12007 / 12013

页数：7

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