Modeling of domain switching in polycrystalline ferroelectric ceramics
Modeling of domain switching in polycrystalline ferroelectric ceramics
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DOI：
10.1088/0964-1726/6/4/008
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发表时间：
1997-08
影响因子：
4.1
通讯作者：
Y. Huo;Q. Jiang
中科院分区：
文献类型：
--
作者：
Y. Huo;Q. Jiang
本文研究了多晶铁电陶瓷中畴反转的模型。在本分析中，每个晶粒被建模为一个混合物，由不同类型的域，其特征在于它们的质量分数作为内部变量。畴变对应于相应畴质量分数的变化，畴变的驱动力是吉布斯能差。提出了一种基于统计学的准静态过程畴切换判据。数值计算结果表明，多晶效应对一维铁电系统的电场分布和极化响应有显著影响.
This paper is concerned with the modeling of domain switching in polycrystalline ferroelectric ceramics. In the present analysis, each grain is modeled as a mixture, consisting of distinct types of domains which are characterized by their mass fractions as internal variables. Domain switching corresponds to changes of mass fractions of the corresponding domains, and the driving force of domain switching is the difference in Gibbs' energies. A thermodynamics-based criterion is proposed to govern domain switching in quasi-static processes. Some numerical results for an idealized one-dimensional ferroelectric system are included to illustrate the polycrystalline effect on the grain-level electric field distribution and the polarization response to applied electric fields.