Transitions de phases dans les composés Na3MX6 (M = Ti, Co, In; X = O, F)
Identifieur interne : 001037 ( Main/Exploration ); précédent : 001036; suivant : 001038Transitions de phases dans les composés Na3MX6 (M = Ti, Co, In; X = O, F)
Auteurs : M. Hamadène [Algérie] ; J. Grannec [France] ; J. Ravez [France] ; A. Laïdoudi-Guehria [Algérie]Source :
- Journal of Fluorine Chemistry [ 0022-1139 ] ; 1996.
English descriptors
Abstract
Abstract: Structural phase transitions were detected in Na3TiOF5, Na3CoF6 and Na3InF6 by micro-DTA and X-ray diffraction. Optical measurements were performed on single crystals. Ferroelastic domains were observed for the low-temperature phases.The three compounds are isostructural with phases of general formula Na3MF6 (M = 3d transition or IIIb elements). At high temperature, all these compounds exhibit the cubic Fm—m symmetry which is the prototype phase. The ferroelastic Curie temperature was related to the size and the electronic configuration of the cation Mn+.
Url:
DOI: 10.1016/0022-1139(96)03420-3
Affiliations:
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