中国物理B ›› 2012, Vol. 21 ›› Issue (9): 97701-097701.doi: 10.1088/1674-1056/21/9/097701

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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

邱建华, 丁建宁, 袁宁一, 王秀琴   

  1. Center for Low-dimensional Materials, Micro-nano Devices and System, Changzhou University, Changzhou 213164, China
  • 收稿日期:2012-03-15 修回日期:2012-04-09 出版日期:2012-08-01 发布日期:2012-08-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10904053), the Jiangsu Provincial Natural Science Foundation for Colleges and Universities, China (Grant No. 09KJB140002), and the Priority Academic Development Program of Jiangsu Higher Education Institutions and Qing Lan Project, China.

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

Qiu Jian-Hua (邱建华), Ding Jian-Ning (丁建宁), Yuan Ning-Yi (袁宁一), Wang Xiu-Qin (王秀琴)   

  1. Center for Low-dimensional Materials, Micro-nano Devices and System, Changzhou University, Changzhou 213164, China
  • Received:2012-03-15 Revised:2012-04-09 Online:2012-08-01 Published:2012-08-01
  • Contact: Ding Jian-Ning E-mail:dingjn@cczu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10904053), the Jiangsu Provincial Natural Science Foundation for Colleges and Universities, China (Grant No. 09KJB140002), and the Priority Academic Development Program of Jiangsu Higher Education Institutions and Qing Lan Project, China.

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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 ca1/ca2/ca1/ca2 phase is much larger than that in the monodomain 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.

关键词: polydomain, electrocaloric effect, phase transition

Abstract: 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 ca1/ca2/ca1/ca2 phase is much larger than that in the monodomain 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.

Key words: polydomain, electrocaloric effect, phase transition

中图分类号:  (Polarization and depolarization)

  • 77.22.Ej
77.80.-e (Ferroelectricity and antiferroelectricity) 77.80.bn (Strain and interface effects)