Cluster polarization of Cd2Nb2O7 compound

被引：37

作者：

Ang, C ^{[1
]}

Cross, LE ^{[1
]}

Guo, R ^{[1
]}

Bhalla, AS ^{[1
]}

机构：

[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 05期

关键词：

D O I：

10.1063/1.127101

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The direct-current (dc) electric-field dependence of dielectric constant around paraelectric-ferroelectric transition in Cd2Nb2O7 has been studied. The results show significant suppression of the dielectric constant by the application of de bias. The electric-field dependence of the dielectric constant at the temperature around paraelectric-ferroelectric phase transition can be well described by the modified Devenshire relation including a cluster term, i.e., epsilon(E) = epsilon(1) - epsilon(2)E(2) + epsilon(3)F(4) + (Px/epsilon(0))[cosh(Ex)](-2). The fit parameters indicate that the polar-cluster carries polarization P = similar to 0.5- 2.5 mC/m(2) with the cluster size of L= similar to 11 - 15 nm. (C) 2000 American Institute of Physics. [S0003-6951(00)04531-9].

引用

页码：732 / 734

页数：3

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