Dielectric spectroscopy analysis of CaCu3Ti4O12 polycrystalline systems

被引：50

作者：

Bueno, P. R. ^{[1
]}

Ramirez, M. A. ^{[1
]}

Varela, J. A. ^{[1
]}

Longo, E. ^{[1
]}

机构：

[1] Univ Estadual Paulista, Dept Fisicoquim, Inst Quim, BR-14800900 Sao Paulo, Brazil

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 19期

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1063/1.2386916

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dielectric spectroscopy was used in this study to examine CaCu3Ti4O12 polycrystalline samples. The analysis involved systems presenting low non-Ohmic properties, and the grain's internal domain was evaluated separately from the contribution of barrier-layer capacitances associated with Schottky-type barriers in this type of material. The effect of oxygen-rich atmosphere and high cooling rate was evaluated, revealing a strong increase in the dielectric properties of the CaCu3Ti4O12 system under these conditions. This effect was attributed to a chemical change in the grain's internal domain, which may be considered an internal barrier-layer capacitance of the polycrystalline material. (c) 2006 American Institute of Physics.

引用

页数：3