The grain-size-dependent behaviors of nano-grained ferroelectric polycrystals: a phase-field study

被引：0
作者：
Ning Liu
Yu Su
机构：
[1] Beijing Institute of Technology,State Key Laboratory of Explosion Science and Technology
[2] Beijing Institute of Technology,Department of Mechanics, School of Aerospace Engineering
来源：
Acta Mechanica | 2014年 / 225卷
关键词：
Domain Wall; Size Dependence; Spontaneous Polarization; Remnant Polarization; Domain Switching;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this work, the electromechanical behaviors of nano-grained ferroelectric ceramics are numerically studied with different grain sizes. The material under investigation is nano-grained barium titanate ceramic, which shows noticeable grain size dependence of the electromechanical characteristics. A 2D polycrystal phase-field model is developed to investigate the hysteresis loops and the process of the microstructural evolution upon applied bipolar electric field. A core–shell model has been selected to treat the grain interior and the grain boundary with separate ferroelectric properties. Such treatment is analogous to the consideration of a grain-boundary-affected zone as in the study of nano-crystalline plasticity. The grain size dependence of the ferroelectric properties, e.g., coercive electric field and remnant polarization, is examined based on this model, and the mechanism of the grain size dependence is analyzed.
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页码：1335 / 1345
页数：10
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