Origin of piezoelectricity for langasite A3Ga5SiO14 (A = La and Nd) under high pressure
Origin of piezoelectricity for langasite A3Ga5SiO14 (A = La and Nd) under high pressure
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DOI：
10.1016/j.jeurceramsoc.2007.02.177
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发表时间：
2007-01-01
影响因子：
5.7
通讯作者：
Morikoshi, H.
中科院分区：
文献类型：
--
作者：
Araki, N.;Ohsato, H.;Morikoshi, H.
本文从高压下硅酸镧镓的晶体结构出发，阐明了前文所述的硅酸镧镓压电性的起源。硅酸镧镓的晶体结构具有三角对称性，在两个大的阳离子A位和B位之间存在特殊的空位。空的空间为压电工作。当在[10 0]方向上施加力时，由于[10 0]方向上的A-阳离子向空的空间移动和A-十面体在[-100]方向上的变形而形成极性，从而产生压电性。尽管A位发生了变形。A-和B-离子之间的原子距离不会由于静电排斥而改变。空区在整个空区中起着保持A-B相邻原子距离和减小B-A原子距离的作用。在高压下。可以清楚地看出，包括空的空间的a方向的线性可压缩性大于c方向的线性可压缩性。这表明空的空间有助于压电性。此外，它被澄清，A-和B-阳离子之间的键距的可压缩性小于A-和B-阳离子之间的键距在空的空间。(c)2007爱思唯尔有限公司保留所有权利。
The origin of piezoelectricity for langasite stated by a previous article has been clarified from the crystal structure under high pressure. The crystal structure of langasite with trigonal symmetry has the special empty-spaces located between A- and B-sites which are two large cation sites. The empty-space works for piezoelectricity. When a force is applied to the [10 0] direction, piezoelectricity was produced by the formation of polarity due to the shift of the A-cation in the [10 0] direction towards empty-space and deformation of the A-decahedron in the [-100] direction. In spite of the deformation of the A-site. the atomic distance between A- and B-ions is not changed due to the electrostatic repulsion. The empty-space plays a role keeping of the A-B adjacent atomic distance and decreasing the B-A atomic distance throughout the empty-space. Under high pressure. it was clarified that the linear compressibility of the a-direction including the empty-space is larger than that of the c-direction. This shows the empty-space is contributing to the piezoelectricity. Also, it was clarified that the compressibility of the bond distance between A-and B-cations is smaller than that of the bond distance between A- and B-cations over the empty-space. (c) 2007 Elsevier Ltd. All rights reserved.