Simulations of gradual domain-switching in polycrystalline ferroelectrics using an optimization-based, multidomain-grain model

Simulations of gradual domain-switching in polycrystalline ferroelectrics using an optimization-based, multidomain-grain model
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使用基于优化的多域晶粒模型模拟多晶铁电体中的逐渐域切换

DOI:
10.1016/j.compstruc.2010.11.002
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发表时间:
2011-06
影响因子:
4.7
通讯作者:
Li, F. X.
Li, F. X.
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhou, X. L.;Li, F. X.

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提出了一种基于优化计算模型的多晶铁电体约束畴切换研究方法。区域切换是通过优化算法来实现的,以最小化每个颗粒的自由能,因此是一个渐进的过程。与相场模型相似,该模型不引入先验的域切换判据,计算效率大大提高。还可以捕获域纹理的演化过程。对四边形和菱形PZT陶瓷的仿真结果表明了该模型的有效性。
An optimization-based computational model is proposed to study the constrained domain switching in polycrystalline ferroelectrics composed of numerous grains, each of which consists of multiple domains. Domain switching is realized by an optimization algorithm to minimize the free energy of each grain and is thus a gradual process with applied loading. Similar to phase field modeling, no priori domain-switching criterion is imposed in the proposed model and its computational efficiency is much higher. The domain textures evolution process can also be captured. Simulation results on both tetragonal and rhombohedral PZT ceramics illustrate the efficiency of this model.
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