Correlation among oxygen vacancies in bismuth titanate ferroelectric ceramics

被引：104

作者：

Li, W ^{[1
]}

Chen, K ^{[1
]}

Yao, YY ^{[1
]}

Zhu, JS ^{[1
]}

Wang, YN ^{[1
]}

机构：

[1] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 20期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.1823583

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Pure Bi4Ti3O12 ceramics were prepared using the conventional solid-state reaction method and their dielectric properties were investigated. A dielectric loss peak with the relaxation-type characteristic was observed at about 370 K at 100 Hz frequency. This peak was confirmed to be associated with the migration of oxygen vacancies inside ceramics. The Cole-Cole fitting to this peak reveals a strong correlation among oxygen vacancies and this strong correlation is considered to commonly exist among oxygen vacancies in ferroelectrics. Therefore, the migration of oxygen vacancies in ferroelectric materials would demonstrate a collective behavior instead of an individual one due to this strong correlation. Furthermore, this correlation is in proportion to the concentration and in inverse proportion to the activation energy of oxygen vacancies. These results could be helpful to the understanding of the fatigue mechanisms in ferroelectric materials. (C) 2004 American Institute of Physics.

引用

页码：4717 / 4719

页数：3

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