The crystal structure of the compound Sr(AsUO6)2·8H2O 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, beta = 92.67(2)°, Z = 2). The structure is built by (001)-parallel [AsUO6]- layers formed by flattened square UO6 bipyramids and AsO4 tetrahedra. The neighboring layers are connected via SrO8 square antiprisms. The cavities of the polyhedral framework thus formed are occupied by H2O 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.
Crystal structure of Sr(AsUO6)2·8H2O
PASERO, MARCO;MERLINO, STEFANO;
2003-01-01
Abstract
The crystal structure of the compound Sr(AsUO6)2·8H2O 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, beta = 92.67(2)°, Z = 2). The structure is built by (001)-parallel [AsUO6]- layers formed by flattened square UO6 bipyramids and AsO4 tetrahedra. The neighboring layers are connected via SrO8 square antiprisms. The cavities of the polyhedral framework thus formed are occupied by H2O 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
