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Origin of piezoelectricity for langasite A3Ga5SiO14 (A=La and Nd) under high pressure
- Source :
-
Journal of the European Ceramic Society . Nov2007, Vol. 27 Issue 13-15, p4099-4102. 4p. - Publication Year :
- 2007
-
Abstract
- Abstract: 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 [100] direction, piezoelectricity was produced by the formation of polarity due to the shift of the A-cation in the [100] 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 27
- Issue :
- 13-15
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 25626429
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2007.02.177