Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics

被引：105
|
作者：
Ferrarelli, Matthew C. [1 ]
Sinclair, Derek C. [1 ]
West, Anthony R. [1 ]
Dabkowska, Hanna A. [2 ]
Dabkowski, Antoni [2 ]
Luke, Graeme M. [2 ]
机构：
[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England
[2] McMaster Univ, Dept Phys & Astron, Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2009年 / 19卷 / 33期
基金：
英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会;
关键词：
HIGH-DIELECTRIC-CONSTANT; ATOMIC-FORCE MICROSCOPY; NONFERROELECTRIC CACU3TI4O12; DEFECT STRUCTURE;
D O I：
10.1039/b910871h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Impedance spectroscopy has been performed on CaCu3Ti4O12 (CCTO) single crystals and ceramics using Au and InGa alloy electrodes. The extrinsic effect responsible for the giant permittivity observed at radio-frequencies near room temperature is shown to be different for single crystals and ceramics. For single crystals it is attributed to a non-ohmic electrode contact to semiconducting CCTO. For ceramics it is attributed to an internal barrier layer capacitor mechanism associated with semiconducting CCTO grains and insulating grain boundaries.
引用
收藏
页码：5916 / 5919
页数：4
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