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

被引：106

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

页码：5916 / 5919

页数：4

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