Dielectric relaxation induced internal electric field and its effect on magnetoelectric state in Co4Nb2O9

被引：0
|
作者：
机构：
[1] [1,Xie, Yuanmiao
[2] Zang, Hao
[3] Ceng, Wen-Dan
[4] Wang, Shuting
[5] Wang, Chunchang
来源：
Xie, Yuanmiao (xieyuanmiao@126.com) | 1600年 / Blackwell Publishing Inc.卷 / 101期
基金：
中国国家自然科学基金;
关键词：
Dielectric relaxation - Cobalt compounds - Pyroelectricity - Electric fields;
D O I：
暂无
中图分类号：
O441.1 [电学]; TM12 [];
学科分类号：
摘要：
Pyrocurrent and dielectric properties of magnetoelectric antiferromagnet Co4Nb2O9 have been investigated. The sample shows 2 thermally activated dielectric relaxations in the temperature range far above Néel temperature with the low- and high-temperature ones being a dipolar and Maxwell-Wagner relaxations, respectively. Two types of dipoles: relaxing dipoles and magnetic-field-induced dipoles were found in the sample. An internal electric field is formed due to the ordering of relaxing dipoles. Three current peaks were observed. The 2 higher temperature current peaks correspond to the dielectric relaxations. The lowest temperature current peak contains a positive tip and negative dip. The tip and dip are related to the depolarization of ferroelectricity induced by external and internal fields, respectively. © 2017 The American Ceramic Society
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