Strong nonlinear current-voltage behaviour in perovskite-derivative calcium copper titanate

被引：801

作者：

Chung, SY ^{[1
]}

Kim, ID

Kang, SJL

机构：

[1] Inha Univ, Dept Mat Sci & Engn, Inchon 402751, South Korea

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[3] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

来源：

NATURE MATERIALS | 2004年 / 3卷 / 11期

关键词：

D O I：

10.1038/nmat1238

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：

The discovery of a giant dielectric constant(1-3) of 10(5) in CaCu3Ti4O12 has increased interest in this perovskite-type oxide. Here we demonstrate that, in addition to high permittivity, CaCu3Ti4O12 has remarkably strong nonlinear current-voltage characteristics without the addition of any dopants. An intrinsic electrostatic barrier at the grain boundaries is responsible for the unusual nonlinear behaviour. The nonlinear coefficient of CaCu3Ti4O12 reaches a value of 900, which is even greater than that of the varistor material(4) ZnO. As a result, CaCu3Ti4O12 may lead to efficient switching and gas-sensing devices.

引用

页码：774 / 778

页数：5

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