上海交通大学学报(自然版)

• 物理学 • 上一篇    下一篇

梯度应力对BaTiO3薄膜电性质的影响

李立本,陈庆东,李新忠,甄志强,胡志祥   

  1. (河南科技大学 物理与工程学院,河南 洛阳 471003)
  • 收稿日期:2009-05-15 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Effect of Gradient Stress on the Dielectric Constant of BaTiO3 Film

LI Liben,CHEN Qingdong,LI Xinzhong,ZHEN Zhiqiang,HU Zhixiang   

  1. (School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China)
  • Received:2009-05-15 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要: 通过求解弹性力学方程而得到薄膜的应力分布形式,并将其用于朗道热力学理论,以解释生长于张应力衬底BaTiO3薄膜的电性质.结果表明:在生长于镀铂硅衬底的BaTiO3薄膜中,a和aa相共存,但由于两相的自发极化均平行于薄膜表面而无法观测到其电滞回线;随着温度升高,BaTiO3薄膜的等效介电常数呈现出弥散特征,其理论结果与实验结果较吻合.

关键词: 铁电体, 薄膜, 应力, 自发极化, 介电常数

Abstract: A set of gradient stress was obtained by solving the elastic mechanical equations and used to Landau thermodynamic theory to explain the diffuse dielectric anomaly of BaTiO3 film grown on a tensile substrate. The results predict that a and aaphase may coexist in the film. The hysteretic spontaneous polarization behavior of the film can not be revealed for the inplane polarization exists for the two phases. The temperature dependence of outplane dielectric constant agrees with the experimental result.

中图分类号: