Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics

被引：163
|
作者：
Li, Ming [1 ]
Feteira, Antonio [1 ]
Sinclair, Derek C. [1 ]
West, Anthony R. [1 ]
机构：
[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 23期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1063/1.2200732
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Comparison of impedance spectroscopy data for undoped CaCu3Ti4O12 (CCTO) and CaCu2.94Mn0.06Ti4O12 CCMTO ceramics shows Mn doping to suppress the room temperature bulk semiconductivity. of similar to 0.01 S cm(-1) for CCTO by six orders of magnitude. The magnitude of and activation energy for bulk conduction in CCMTO are similar to those of the insulating grain boundaries in CCTO ceramics. A model to explain the suppression of the bulk conductivity in CCMTO ceramics is proposed; the grain and grain boundary regions in CCTO ceramics may consist of the same phase but with slightly different compositions. (c) 2006 American Institute of Physics.
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