A Mesoscopic Electromechanical Theory of Ferroelectric Films and Ceramics
A Mesoscopic Electromechanical Theory of Ferroelectric Films and Ceramics
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DOI：
10.1063/1.1499571
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
Jiangyu Li;K. Bhattacharya
中科院分区：
文献类型：
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作者：
Jiangyu Li;K. Bhattacharya
我们提出了一个多尺度建模框架来预测铁电陶瓷和薄膜的有效机电行为。本文特别侧重于介观尺度和模型的影响域和域切换考虑到晶粒间的约束。从单晶和极化前颗粒织构的性质出发，该理论预测了畴图案、极化后织构、饱和极化、饱和应变和机电模量。我们表现出显着的协议与实验数据。该理论还解释了PZT在准同型相界具有上级机电性能的原因。本文最后应用该理论预测了所选材料中增强机电耦合因子和高应变驱动的最佳织构。
We present a multi‐scale modelling framework to predict the effective electromechanical behavior of ferroelectric ceramics and thin films. This paper specifically focuses on the mesoscopic scale and models the effects of domains and domain switching taking into account intergranular constraints. Starting from the properties of the single crystal and the pre‐poling granular texture, the theory predicts the domain patterns, the post‐poling texture, the saturation polarization, saturation strain and the electromechanical moduli. We demonstrate remarkable agreement with experimental data. The theory also explains the superior electromechanical property of PZT at the morphotropic phase boundary. The paper concludes with the application of the theory to predict the optimal texture for enhanced electromechanical coupling factors and high‐strain actuation in selected materials.