Continuum modeling of charging process and piezoelectricity of ferroelectrets
Continuum modeling of charging process and piezoelectricity of ferroelectrets
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DOI：
10.1063/1.4819441
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发表时间：
2013-09
影响因子：
3.2
通讯作者：
Bai-Xiang Xu;H. Seggern;S. Zhukov;D. Gross
中科院分区：
文献类型：
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作者：
Bai-Xiang Xu;H. Seggern;S. Zhukov;D. Gross
带电微孔泡沫形式的铁电驻极体表现出非常大的纵向压电系数d33。因此，该结构作为传感器特别是在声学装置中受到广泛的应用兴趣。在充电过程中，在泡沫的气孔中发生电击穿（帕邢击穿）并引入自由电荷对。这些电荷被静电力分离，并重新定位在聚合物和电分解介质之间的界面处，在那里它们被准静态地捕获。这种捕获电荷密度沿着界面的发展是实现铁电驻极体压电性的关键。在这篇文章中，提出了一个基于内部变量的连续模型来计算界面处的电荷密度发展，而基于麦克斯韦应力的机电模型用于体行为，即，的聚合物和介质的帕邢击穿发生。在建模过程中，...
Ferroelectrets in the form of electrically charged micro-porous foams exhibit a very large longitudinal piezoelectric coefficient d33. The structure has hence received wide application interests as sensors particularly in acoustic devices. During charging process, electrical breakdown (Paschen breakdown) takes place in the air pores of the foam and introduces free charge pairs. These charges are separated by electrostatic forces and relocated at the interfaces between the polymer and the electrically broken-down medium, where they are trapped quasistatically. The development of this trapped charge density along the interfaces is key for enabling the piezoelectricity of ferroelectrets. In this article, an internal variable based continuum model is proposed to calculate the charge density development at the interfaces, whereas a Maxwell stress based electromechanical model is used for the bulk behavior, i.e., of the polymer and of the medium where the Paschen breakdown takes place. In the modeling, the elec...