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Structural study of the ferroelectric instability in SnPSe |
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| Authors: | R. Enjalbert J. Galy Y. Vysochanskii A. Ouédraogo P. Saint-Grégoire |
| Affiliation: | (1) CEMES-CNRS (UP - CNRS 8011), B.P. 4347, 31055 Toulouse Cedex, France, FR;(2) Department of Physics and Chemistry of Solid State, Uzhgorod State University, 294000 Uzhgorod Ukraine, UA;(3) Université de Ouagadougou, FAST, Ouagadougou, Burkina, BF;(4) Université Toulon-Var, Batiment R, B.P. 132, 83957 La Garde Cedex, France, FR |
| Abstract: | The structural change occurring in between the paraelectric and the ferroelectric phases is investigated by means of X-ray diffraction. Details of the structure in both phases are obtained and the role of the lone pair is discussed in the light of structural data. In agreement with the 2/ m to m symmetry lowering, polar displacements are found within the m plane away from a particular crystallographic direction but antiparallel displacements occur also. These results are discussed in the frame of the phenomenological theory which predicts a particular temperature dependence of the dielectric polarization in this crystal. Received: 10 July 1998 |
| Keywords: | PACS. 61.10.Nz Crystal structure solution and refinement techniques using X-rays - 64.70.Rh Solid-solid transitions - 77.80.-e Ferroelectricity and antiferroelectricity |
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