A percolative ferroelectric-metal composite with hybrid dielectric dependence
A percolative ferroelectric-metal composite with hybrid dielectric dependence
复制标题
具有混合介电依赖性的渗透铁电金属复合材料
DOI：
10.1016/j.scriptamat.2007.07.020
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发表时间：
2007-11-01
影响因子：
6
通讯作者：
Du, Piyi
中科院分区：
文献类型：
--
作者：
Chen, Zuhuang;Huang, Jiquan;Du, Piyi
通过对传统陶瓷法制备的BaTiO_3-Ni复合材料的分析，研究了双折射铁电-金属复合材料的混合介电特性。它是由一个新的理论表达式，展示了真实的介电常数，金属浓度和系统的应用频率之间的关系。偶极响应和空间电荷极化都对介电常数有贡献，特别是在逾渗阈值附近。随着BaTiO 3基体电导率的降低，介电常数对频率的依赖性降低，特别是在低频和逾渗阈值附近。(c)2007 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The hybrid dielectric dependence of a percolative ferroelectric-metal composite is investigated by analyzing BaTiO3-Ni composite prepared by a conventional ceramic method. It is depicted by a novel theoretical expression that exhibits the relationships between the real permittivity, metal concentration and applied frequency of the system. Both the dipolar response and the space charge polarization contribute to the dielectric constant, especially near the percolation threshold. With decreasing conductivity of the BaTiO3 matrix, the dependence of the dielectric constant on frequency decreases, especially at low frequency and near the percolation threshold. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.