Hexagonal-spinel transitions in antimonates Li2Cr3?xMIIIxSbO8 (MIII = Al,Fe, Ga)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Hexagonal-spinel transitions in antimonates Li₂Cr_3?xM^III_xSbO₈ (M^III = Al,Fe, Ga)

Authors:	P Tarte R Cahay J Preudhomme M Hervieu J Choisnet B Raveau

Institution:	Université de Liège, Institut de Chimie, B-4000 Sart-Tilman par Liège 1, Belgium;Laboratorie de Cristallographie et Chimie du Solide, L.A. 251, ISMRA-Université de Caen, 14032 Caen Cedex, France

Abstract:	A new family of antimonates Li₂Cr_3?xM^III_xSbO₈ (M^III = Al, Fe, Ga) was synthesized and studied by X-ray diffraction and ir spectroscopy. The Al-containing compounds exhibit a hexagonal close-packed structure similar to that of LiFeSnO₄ ( $a ? 5.8, c ? 9.5$ Å. For M = Fe or Ga, two structural forms are isolated: a low-temperature hexagonal form which is isotypic with LiFeSnO₄ and a high-temperature cubic form isotypic with the spinel structure. The hexagonal spinel transformation was observed for the first time, while the reverse transformation cannot be obtained.

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