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

doi:10.1088/1674-1056/21/9/097701

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.

Keywords: polydomain electrocaloric effect phase transition

Received: 15 March 2012
Revised: 09 April 2012
Accepted manuscript online:

PACS:	77.22.Ej	(Polarization and depolarization)
	77.80.-e	(Ferroelectricity and antiferroelectricity)
	77.80.bn	(Strain and interface effects)

Fund: 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.

Corresponding Authors: Ding Jian-Ning
E-mail: dingjn@cczu.edu.cn

Cite this article:

Qiu Jian-Hua (邱建华), Ding Jian-Ning (丁建宁), Yuan Ning-Yi (袁宁一), Wang Xiu-Qin (王秀琴) Effect of misfit strain on the electrocaloric effect of polydomain epitaxial ferroelectric thin films 2012 Chin. Phys. B 21 097701

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

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