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‘Face-to-Face’ relationships between oxocentred tetrahedra and cation-centred tetrahedral oxyanions in crystal structures of minerals and inorganic compounds

Published online by Cambridge University Press:  05 July 2018

S. V. Krivovichev ,
G. L. Starova  and
S. K. Filatov
S. V. Krivovichev
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
G. L. Starova
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
S. K. Filatov
Affiliation:
Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
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Abstract

Detailed analysis of the crystal structures of minerals and inorganic compounds containing oxocentred [OCu4] tetrahedra reveals the following principle for relationships between oxocentred tetrahedra and tetrahedral oxyanions (Tn+O4)−(8−n) with T = S6+ or V5+, or triangular pyramidal oxyanions (SeO3)2− (which may be considered as (SeO3E)2− tetrahedra assuming the lone pair E of selenium to be a fourth ligand): (Tn+O4)−(8−n) tetrahedra are ‘attached’ to the oxocentred tetrahedra so that their grounds (O-O-O and Cu-Cu-Cu) are parallel to each other and the mutual orientation is regular (O corners are exactly under Cu corners). We propose to describe these relationships as ‘face-to-face’, meaning that the oxocentred and cation-centred tetrahedra ‘meet’ along their ‘whole’ triangular faces. Geometric characteristics of ‘face-to-face’ relationships are discussed.

Keywords

oxocentred tetrahedracation-centred tetrahedraoxyanionscrystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 2 , April 1999 , pp. 263 - 266
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999 

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