Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores
Polarization-switching dynamics in bulk ferroelectrics with isometric and oriented anisometric pores
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DOI：
10.1088/1361-6463/aa519c
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发表时间：
2017-02-02
影响因子：
3.4
通讯作者：
Genenko, Y. A.
中科院分区：
文献类型：
--
作者：
Khachaturyan, R.;Zhukov, S.;Genenko, Y. A.
高度多孔的铁电陶瓷具有比致密陶瓷明显更小的极化率，相反，它们显示出各种物理性质的高可调性。特别是，孔的形状和取向以及总孔隙率表现出很大的影响极化开关动力学。在目前的工作中，有限元模拟的电场分布和相关的统计分布的局部开关时间进行了分析和比较，与多孔锆钛酸铅陶瓷的开关特性，从实验中提取的极化开关的非均匀场机制模型。令人惊讶的是，模拟的统计场分布原来是几乎独立的孔径分布，但是，它们是敏感的不等轴的形状和取向的孔。此外，他们表现出显着的扩大与增加孔隙率;实验观察证实的效果。
Highly porous ferroelectric ceramics possess remarkably less polarizability than dense ceramics; instead they display high tunability of various physical properties. Particularly, the shape and orientation of pores as well as the total porosity exhibit a great effect on the polarization-switching dynamics. In the present work, finite-element simulations of the electric-field distributions and related statistical distributions of local switching times are analysed and compared with the switching characteristics of porous lead zirconate titanate ceramics, extracted from the experiment by means of the inhomogeneous field mechanism model of polarization switching. Surprisingly, the simulated statistical field-distributions turn out to be virtually independent of the pore-size distribution; however, they are sensitive to the anisometric shape and orientation of the pores. Additionally, they exhibit notable broadening with increasing porosity; an effect confirmed by experimental observations.