Etude cristallographique du systeme FeSSc2S3 preparations et structures de FeSc2S4 et Fe0.85Sc2.10S4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

Etude cristallographique du systeme FeSSc₂S₃ preparations et structures de FeSc₂S₄ et Fe_0.85Sc_2.10S₄

Authors:	Par A Tomas M Guittard J Rigoult B Bachet

Affiliation:	Laboratoire de Chimie Minérale Structurale associé au C.N.R.S. (n°200) Faculté des Sciences Pharmaceutiques et Biologiques de Paris V 4, avenue de l''Observatoire - 75270 Paris Cédex 06, France;Laboratoire de Minéralogie-Cristallographie, Paris VI Tour 16, 2ème ét., 4, place Jussieu, 75230 Paris Cédex 05, France

Abstract:	The crystal structures of FeSc₂S₄ and Fe_0.85Sc_2.10S₄ have been determined by three dimensional X-ray diffraction. The cubic cells, space group Fd3m, have lattice constants $a = 10,501 A ?$ for FeSc₂S₄ and $a = 10,444 A ?$ for Fe_0.85Sc_2.10S₄. Iron is divalent and scandium trivalent. FeSc₂S₄ is a direct spinel structure, Fe_0.85Sc_2.10S₄ is near a spinel structure. Only 0,5 iron atom is on every 8a position; 0,175 Fe and 1,05 Sc lie on octahedral 16d and 16c site.

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