Piezoelectric thin-film superlattices without using piezoelectric materials
Piezoelectric thin-film superlattices without using piezoelectric materials
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DOI：
10.1063/1.3443404
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发表时间：
2010-07-15
影响因子：
3.2
通讯作者：
Sharma, P.
中科院分区：
文献类型：
--
作者：
Sharma, N. D.;Landis, C. M.;Sharma, P.
在本文中，我们表明，实验上可实现的显然压电薄膜超晶格可以从非压电材料提供一个奇数阶（例如，三层）堆叠顺序。挠曲电性的尺寸依赖性机制（其将应变梯度与极化耦合）允许这种可能性。我们提出了各种薄膜和超晶格配置的响应的封闭形式的解析表达式。我们还澄清了一些微妙之处，出现在考虑界面边界条件的理论flexoelectricity以及flexoelectricity的关系，经常使用的极化梯度项用于建模铁电体。我们发现，对于某些（最佳）材料组合和长度尺度，薄膜超晶格产生表观压电接近75%的铁电钛酸钡可能是可以实现的。(C)2010年美国物理学会。[doi：10.1063/1.3443404]
In this paper we show that experimentally realizable apparently piezoelectric thin-film superlattices can be created from nonpiezoelectric materials provided an odd-order (e.g., trilayer) stacking sequence is used. The size-dependent mechanism of flexoelectricity, which couples gradients of strain to polarization, allows such a possibility. We present closed-form analytical expressions for the response of various thin-film and superlattice configurations. We also clarify some of the subtleties that arise in considering interface boundary conditions in the theory of flexoelectricity as well as the relationship of flexoelectricity to the frequently used polarization gradient terms used in modeling ferroelectrics. We find that for certain (optimum) material combinations and length scales, thin-film superlattices yielding apparent piezoelectricity close to 75% of ferroelectric barium titanate may be achievable. (C) 2010 American Institute of Physics. [doi:10.1063/1.3443404]