4.7 Article

Oxygen-vacancy-related relaxations of Sr3CuNb2O9 at high temperatures

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 552, 期 -, 页码 279-282

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.10.081

关键词

Ceramics; Solid state reactions; Dielectric response; Order-disorder effects

资金

  1. National Natural Science Foundation of China [11074001]

向作者/读者索取更多资源

Sr3CuNb2O9 ceramics were prepared via the solid-state reaction route. The dielectric properties of the sample were investigated as a function of temperature (300-1100 K) in the frequency range from 20 Hz to 10 MHz. Three thermally activated dielectric relaxations were observed with the activation energy of 0.44 eV, 0.62 eV, and 1.07 eV for the low-, middle-, and high-temperature relaxation, respectively. Our results revealed that all the relaxations are related to oxygen vacancy. It was determined that the low-temperature relaxation is a Maxwell-Wagner relaxation due to the surface layer effect. The middle- temperature relaxation was found to be related to the ordering process of the oxygen vacancies. The high-temperature relaxation was associated with the conductivity originated from the hopping motions of oxygen vacancies. Crown Copyright (C) 2012 Published by Elsevier B. V. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据