Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films

doi:10.1088/1674-1056/20/10/107701

中国物理B ›› 2011, Vol. 20 ›› Issue (10): 107701-107701.doi: 10.1088/1674-1056/20/10/107701

Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films

蒋泉¹, 张春祖², 周志东³

(1)College of Civil Engineering, Nantong University, Nantong 226019, China; (2)Department of Civil Engineering, School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, China; (3)Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China

收稿日期:2011-04-26 修回日期:2011-06-10 出版日期:2011-10-15 发布日期:2011-10-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10802070, 10972188, and 10902055), Natural Science Foundation of Fujian Province of China (Grant No. 2011J01329), and the Fundamental Research Funds for the Central Universities of China (Grant No. 2011121002).

Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films

Zhou Zhi-Dong(周志东)^a)^†, Zhang Chun-Zu(张春祖)^b), and Jiang Quan(蒋泉)^c)

^a Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China; ^b Department of Civil Engineering, School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, China; ^c College of Civil Engineering, Nantong University, Nantong 226019, China

Received:2011-04-26 Revised:2011-06-10 Online:2011-10-15 Published:2011-10-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10802070, 10972188, and 10902055), Natural Science Foundation of Fujian Province of China (Grant No. 2011J01329), and the Fundamental Research Funds for the Central Universities of China (Grant No. 2011121002).

摘要/Abstract

摘要： The effects of internal stresses and depolarization fields on the properties of epitaxial ferroelectric perovskite thin films are discussed by employing the dynamic Ginzburg-Landau equation (DGLE). The numerical solution for BaTiO₃ film shows that internal stress and the depolarization field have the most effects on ferroelectric properties such as polarization, Curie temperature and susceptibility. With the increase of the thickness of the film, the polarization of epitaxial ferroelectric thin film is enhanced rapidly under high internal compressively stress. With the thickness exceeding the critical thickness for dislocation formation, the polarization increases slowly and even weakens due to relaxed internal stresses and a weak electrical boundary condition. This indicates that the effects of mechanical and electrical boundary conditions both diminish for ferroelectric thick films. Consequently, our thermodynamic method is a full scale model that can predict the properties of ferroelectric perovskite films in a wide range of film thickness.

关键词: ferroelectric film, internal stresses, thermodynamic equations, polarizations

Abstract: The effects of internal stresses and depolarization fields on the properties of epitaxial ferroelectric perovskite thin films are discussed by employing the dynamic Ginzburg-Landau equation (DGLE). The numerical solution for BaTiO₃ film shows that internal stress and the depolarization field have the most effects on ferroelectric properties such as polarization, Curie temperature and susceptibility. With the increase of the thickness of the film, the polarization of epitaxial ferroelectric thin film is enhanced rapidly under high internal compressively stress. With the thickness exceeding the critical thickness for dislocation formation, the polarization increases slowly and even weakens due to relaxed internal stresses and a weak electrical boundary condition. This indicates that the effects of mechanical and electrical boundary conditions both diminish for ferroelectric thick films. Consequently, our thermodynamic method is a full scale model that can predict the properties of ferroelectric perovskite films in a wide range of film thickness.

Key words: ferroelectric film, internal stresses, thermodynamic equations, polarizations

中图分类号: (Epitaxial and superlattice films)

77.55.Px

05.70.-a (Thermodynamics) 77.80.bn (Strain and interface effects)

周志东, 张春祖, 蒋泉. Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films[J]. 中国物理B, 2011, 20(10): 107701-107701.

Zhou Zhi-Dong(周志东), Zhang Chun-Zu(张春祖), and Jiang Quan(蒋泉) . Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films[J]. Chin. Phys. B, 2011, 20(10): 107701-107701.

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Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films

Effect of electromechanical boundary conditions on the properties of epitaxial ferroelectric thin films

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