Acta Cryst. (2002). E58, i52-i55  [ doi:10.1107/S1600536802009261 ]

Barium palladium selenostannate perselenostannate diselenide, Ba₈Pd(SnSe₄)_3.75(SnSe₅)_0.25(Se₂)

D. Johrendt

Abstract: The quaternary selenostannate Ba₈Pd(SnSe₄)_3.75(SnSe₅)_0.25(Se₂) adopts a new structure type composed of SnSe₄ tetrahedra in a distorted cubic close-packing arrangement. Pd₂(Se₂)₂ hexagons containing two Pd atoms and two Se₂ dumb-bells fill one-eighth of the octahedral voids. Two Se atoms from the diselenide groups and the neighbouring SnSe₄ units, respectively, form a distorted square-planar coordination around palladium. Eight or nine Se atoms surround the Ba²⁺ cations. One SnSe₄^4- tetrahedron is substituted statistically by a perselenostannate ion SnSe₅^4- to an extent of approximately 25%.

Online 31 May 2002

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