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

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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2004-11
Language
ENG
Keywords

HIGH-DIELECTRIC-CONSTANT; ZINC-OXIDE VARISTORS; ELECTRICAL-PROPERTIES; THIN-FILMS; CACU3TI4O12; CERAMICS; MICROSCOPY

Citation

NATURE MATERIALS, v.3, no.11, pp.774 - 778

ISSN
1476-1122
DOI
10.1038/nmat1238
URI
http://hdl.handle.net/10203/82877
Appears in Collection
MS-Journal Papers(저널논문)
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