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考虑外延钙钛矿型铁电薄膜内的等效应力、表面晶格变化和表面电荷引起的退极化效应等机电耦合边界条件,利用铁电薄膜系统的动态金茨堡-朗道方程(DGL),系统分析和讨论了外延铁电薄膜相变温度与临界相变厚度的尺寸效应.结果表明,铁电薄膜相变温度与临界相变厚度完全依赖于各种与薄膜厚度相关的力电耦合边界条件.也给出了BaTiO3外延铁电薄膜相变温度在各种边界条件下随厚度的变化,从结果看出,本文的分析与结论更符合实验数据.
Taking the electromechanical coupling boundary conditions such as the equivalent stress in the epitaxial perovskite ferroelectric thin film, the surface lattice change and the depolarization effect caused by the surface charge, the dynamic Günzburg-Landau equation (DGL) ), The size effect of the phase transition temperature and the critical phase change thickness of the epitaxial ferroelectric thin film was systematically analyzed and discussed. The results show that the phase transition temperature and the critical phase transition thickness of the ferroelectric thin film are completely dependent on the various kinds of force- The boundary conditions are also given.The phase transition temperature of the BaTiO3 epitaxial ferroelectric thin films changes with the thickness under various boundary conditions.The results show that the analysis and conclusions in this paper are more in line with the experimental data.