Effect of misfit strain on the electrocaloric effect of polydomain epitaxial ferroelectric thin films

被引：9
|
作者：
Qiu Jian-Hua [1 ]
Ding Jian-Ning [1 ]
Yuan Ning-Yi [1 ]
Wang Xiu-Qin [1 ]
机构：
[1] Changzhou Univ, Ctr Low Dimens Mat Micronano Device & Syst, Changzhou 213164, Peoples R China
来源：
CHINESE PHYSICS B | 2012年 / 21卷 / 09期
基金：
中国国家自然科学基金;
关键词：
polydomain; electrocaloric effect; phase transition; POLARIZATION;
D O I：
10.1088/1674-1056/21/9/097701
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effect of misfit strain on the electrocaloric effect in polydomain epitaxial BaTiO3 thin films at room temperature is investigated using the Ginzburg-Landau-Devonshire thermodynamic theory. Numerical calculations indicate that the misfit strain has a large impact on the ferroelectric polarization states and the electrocaloric effect. Most importantly, the electrocaloric effect in the polydomain ca(1)/ca(2)/ca(1)/ca(2) phase is much larger than that in the mondomain c phase and the other polydomain phases. Consequently, a large electrocaloric effect can be obtained by carefully controlling the misfit strain, which may provide potential applications in refrigeration devices.
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页数：6
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