Titre du document / Document title

Crystal structure of deloryite, Cu₄(UO₂)[Mo₂O₈](OH)₆

Auteur(s) / Author(s)

PUSHCHAROVSKY D. Y. ⁽¹⁾ ; RASTSVETAEVA R. K. ⁽²⁾ ; SARP H. ⁽³⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Geology Department, Moscow State University, 119899 Moscow, RUSSIE, FEDERATION DE
⁽²⁾ X-Ray Laboratory of Structural Analysis of Crystals, Institute of Crystallography RAN, 11733 Moscow, RUSSIE, FEDERATION DE
⁽³⁾ Department of Mineralogy of Natural History Museum, BP 434, CH-1211, Geneva, SUISSE

Résumé / Abstract

Copyright (c) 1996 Elsevier Science B.V. All rights reserved. Deloryite, Cu₄(UO₂)[Mo₂O₈](OH)₆, M=946.10, monoclinic, space group C2/m, a=19.94(1), b=6.116(2), c=5.520(3)Å, β=104.18(5)°, V=652.8(1)ų, Z=2, ρ_c=4.78gcm⁻³, λ(MoKα)=0.71073Å, μ=200.22cm⁻¹, dimensions 0.15×0.1×0.1mm³, F(000)=852, room temperature, R=0.064 for 402 reflections with |F|>3σ(F). The crystal structure of deloryite, like its synthetic analogue as well as chemically and crystallographically related derriksite Cu₄(UO₂)(SeO₃)₂(OH)₆, contains layers formed by distorted [Cu(O,OH)₆] octahedra with shared edges. The octahedral layers are linked by columns, built up of alternating pseudotetragonal U^[2+4]O₆ bipyramids and pseudotrigonal Mo^[4+1]O₅ bipyramids. Two MoO₅ bipyramids with shared edge form [Mo₂O₈] dimers with Mo−Mo distances=3.456(4)Å. The five-fold coordination of Mo revealed leads to a different description of the structural model of deloryite with respect to the earlier XRD study of its synthetic analogue. Mo^[4+1]₂O₈ dimers in deloryite replace the pairs of tetrahedra SeO₃E (E=lone-pair electrons) in derriksite.

Revue / Journal Title

Journal of alloys and compounds   ISSN 0925-8388 

Source / Source

1996, vol. 239, n^o1, pp. 23-26

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Lausanne, SUISSE  (1991) (Revue)

Mots-clés anglais / English Keywords

Crystal structure ; Copper hydroxides ; Uranium hydroxides ; Molybdenum hydroxides ; Molybdates ; Space groups ; Interatomic distances ; Lattice parameters ; Coordination polyhedron ; XRD ; Experimental study ;

Mots-clés français / French Keywords

Structure cristalline ; Cuivre hydroxyde ; Uranium hydroxyde ; Molybdène hydroxyde ; Molybdate ; Groupe espace ; Distance interatomique ; Paramètre cristallin ; Polyèdre coordination ; XRD ; Etude expérimentale ;

Mots-clés espagnols / Spanish Keywords

Poliedro coordinación ;

Localisation / Location

INIST-CNRS, Cote INIST : 1151, 35400006032669.0008