Dielectric properties of CaCu3Ti4O12 based multiphased ceramics

被引：126

作者：

Guillemet-Fritsch, S

Lebey, T

Boulos, M

Durand, B

机构：

[1] Univ Toulouse 3, Ctr InterUniv Rech & Ingn Mat, CIRIMAT, LCMIE, F-31062 Toulouse 04, France

[2] Univ Toulouse 3, LGET, F-31062 Toulouse 04, France

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2006年 / 26卷 / 07期

关键词：

powders-chemical preparation; sintering; dielectric properties; CaCu3Ti4O12; capacitors;

D O I：

10.1016/j.jeurceramsoc.2005.01.055

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A "soft chemistry" method, the coprecipitation, has been used to synthesize the perovskite CaCu3Ti4O12 (CCT). Three main types of materials were obtained for both powders and sintered ceramics: a monophased consisting of the pure CCT phase, a biphased (CCT+CaTiO3), and a three-phased (CCT+CaTiO3 + copper oxide (CuO or Cu2O)). These ceramics, sintered at low temperature, 1050 degrees C, present original dielectric properties. The relative permittivity determined in the temperature range (-150 < T < 250 degrees C) is significantly higher than the one reported in the literature. Internal barrier layer capacitor is the probable mechanism to explain the particular behaviour. Moreover, the presence of a copper oxide phase beside the perovksite CCT plays an important role for enhancing the dielectric properties. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1245 / 1257

页数：13

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