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Mise en Evidence et Etude Structurale d'une Famille de Composés en Feuillet de Formule Générale (UO) 2 RS 3 (R = Gd à Lu et Y)
Author(s) -
Guittard M.,
Vovan T.,
JulienPouzol M.,
Jaulmes S.,
Laruelle P.,
Flahaut J.
Publication year - 1986
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19865400909
Subject(s) - crystallography , valency , tetragonal crystal system , crystal structure , solid state , chemistry , materials science , physics , philosophy , linguistics
Description and Structural Study of a New Family of Sheet Compounds of the General Composition (UO) 2 RS 3 (R = Gd to Lu and Y) The reaction of UOS was tested on various sulfides. It was only positive in the case of the R 2 S 3 sulfides at very high temperature (1500—1900°C) with formation of the title compounds. The crystal structure was solved in the case of (UO) 2 ErS 3 : tetragonal cell, space group 14/m mm, a = 3.785, c = 20.83 Å, Z = 2. A sheet structure is formed by alternating (UO) and (ErS 3 ) sheets. The apparent oxydation state of U is 3.5, and there is only one serie of positions for this element. But it is presently impossible to choose between mixed valencies or intermediate valency to represent the electronic state of U.