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Crystal structure of Sr(AsUO)·8HO

Crystallography Reports, ISSN: 1063-7745, Vol: 48, Issue: 2, Page: 212-215
2003
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The crystal structure of the compound Sr(AsUO)·8HO is determined by X-ray diffraction analysis (monoclinic system, sp. gr. Pc, unit-cell parameters a = 7.154(1) Å, b = 7.101(1) Å, c = 18.901(7) Å, β = 92.67(2)°, Z = 2). The structure is built by (001)-parallel [AsUO] layers formed by flattened square UO bipyramids and AsO tetrahedra. The neighboring layers are connected via SrO square antiprisms. The cavities of the polyhedral framework thus formed are occupied by HO molecules. The displacements of the anion complexes by a half-translation with respect to one another along only one lattice period is a characteristic feature of this polymorphous modification of the uran-mica group. © 2003 MAIK "Nauka/Interperiodica".

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