Acta Cryst. (2009). E65, i63-i64  [ doi:10.1107/S1600536809027573 ]

Rietveld refinement of langbeinite-type K₂YHf(PO₄)₃

I. V. Ogorodnyk, I. V. Zatovsky and N. S. Slobodyanik

Abstract: Potassium yttrium hafnium tris(orthophosphate) belongs to the langbeinite-family and is built up from [MO₆] octahedra [in which the positions of the two independent M sites are mutually occupied by Y and Hf in a 0.605 (10):0.395 (10) ratio] and [PO₄] tetrahedra connected via vertices into a three-dimensional framework. This framework is penetrated by large closed cavities in which the two independent K atoms are located; one of the K atoms is nine-coordinated and the other is 12-coordinated by surrounding O atoms. The K, Y and Hf atoms lie on threefold rotation axes, whereas the P and O atoms are located in general positions.

Online 18 July 2009

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