Une structure derivee de celle du spinelle la structure de Fe0.76 Yb2.16 S4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

Une structure derivee de celle du spinelle la structure de Fe_0.76 Yb_2.16 S₄

Authors:	par Alain Tomas Micheline Guittard

Affiliation:	1. Laboratoire de Chimie Minérale Structurale, Associé au CNRS, - FACULTE DES SCIENCES PHARMACEUTIQUES ET BIOLOGIQUES - UNIVERSITE PARIS V - 4, avenue de l''Observatoire - 75270 Paris - Cedex 06 - France;2. Laboratoire de Physique - FACULTE DES SCIENCES PHARMACEUTIQUES ET BIOLOGIQUES - UNIVERSITE PARIS V - 4, avenue de l''Observatoire - 75270 Paris - Cedex 06 - France

Abstract:	Single crystals of so-called “FeYb₂S₄ spinel” were prepared and their crystal structure was solved. The cubic cell, space group Fd3m, has a lattice constant $a = 10.69 A ?$ . From X-rays determinations, its content is (Fe_0.76 Yb_2.16 S₄) × 8. Iron is divalent and ytterbium is trivalent. Ytterbium is in two series of octahedral sites, which are partially filled : 0.96 Yb and 0.04 ? on every 16d position, 0.12 Yb and 0.88 ? on every 16c position. Only 0.76 iron atom is in every 8a position of the spinel.

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