| 梯度应力对BaTiO3薄膜电性质的影响 |
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| 引用本文： | 李立本，陈庆东，李新忠，甄志强，胡志祥.梯度应力对BaTiO3薄膜电性质的影响[J].上海交通大学学报,2010,44(5):655-0658. |
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| 作者姓名： | 李立本，陈庆东，李新忠，甄志强，胡志祥 |
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| 作者单位： | （河南科技大学 物理与工程学院，河南 洛阳 471003） |
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| 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.
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| 关 键 词： | 铁电体 薄膜 应力 自发极化 介电常数 |
| 收稿时间： | 2009-5-15 |
Effect of Gradient Stress on the Dielectric Constant of BaTiO3 Film |
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| LI Li ben,CHEN Qing dong,LI Xin zhong,ZHEN Zhi qiang,HU Zhi xiang.Effect of Gradient Stress on the Dielectric Constant of BaTiO3 Film[J].Journal of Shanghai Jiaotong University,2010,44(5):655-0658. |
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| Authors: | LI Li ben CHEN Qing dong LI Xin zhong ZHEN Zhi qiang HU Zhi xiang |
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| Institution: | （School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China） |
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| 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. |
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| Keywords: | ferroelectric thin film stress spontaneous polarization permittivity |
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