Maxwell-Wagner relaxations and their contributions to the high permittivity of calcium copper titanate ceramics

被引：142

作者：

Li, Wei ^{[1
]}

Schwartz, Robert W. ^{[1
]}

机构：

[1] Univ Missouri, Dept Mat Sci & Engn, Rolla, MO 65409 USA

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.75.012104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Calcium copper titanate ceramics were fabricated by cold isostatic pressing at various calcination and sintering conditions. Depending on fabrication condition, three electrical responses were observed in the combined modulus and impedance plots, indicating the presence of two Maxwell-Wagner relaxations. These electrical responses show different response to temperature and applied field. The activation energies, as well as the driving force factors, were calculated for these relations. The determined activation energy values are in the range of 0.57 to 0.65 eV. The contribution of Maxwell-Wagner relaxations to the high permittivity of CCTO and related materials is briefly discussed.

引用

页数：4

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