Piezoelectric composite based on the enhanced flexoelectric effects
Piezoelectric composite based on the enhanced flexoelectric effects
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DOI：
10.1063/1.2382740
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发表时间：
2006-11
影响因子：
4
通讯作者：
Wenyi Zhu;John Y. Fu;Nan Li;L. Cross
中科院分区：
文献类型：
--
作者：
Wenyi Zhu;John Y. Fu;Nan Li;L. Cross
在这项研究中，压电复合材料由Ba0.67Sr0.33TiO3（BST）组合物和空气制成，并在室温（24°C）下测量，其中BST处于顺电中心相。电荷分离机制是挠曲电性，由复合材料的每个BST构建单元的金字塔边界形状引入的应变梯度驱动。尽管建筑单元的宏观（毫米）尺寸抑制了陡峭的应变梯度，但复合材料具有足够的活性，可以使用常规的Berlincourt d33测量仪进行测量。实验结果表明，实验值与理论值吻合较好，与实验值吻合较好，与实验值吻合较好。
In this study, a piezoelectric composite is fabricated from a Ba0.67Sr0.33TiO3 (BST) composition and air, and measured at room temperature (24°C) where the BST is in its paraelectric centric phase. The charge separation mechanism is flexoelectricity, driven by the strain gradient introduced by the pyramidal boundary shapes of each BST building unit of the composite. In spite of the macro (millimeter) dimensions of the building units that inhibit a steep strain gradient, the composite is sufficiently active to be measured by using a conventional Berlincourt d33 meter. The measured values are in good agreement with expectation from the earlier measured flexoelectric coefficient μ11 of the BST and the finite element simulation results of the strain gradient in the pyramid BST units.