Potassium ditin(IV) tris-[phosphate(V)], KSn 2(PO 4) 3

Abstract

The title compound, KSn 2(PO 4) 3, belongs to the NASICON-type family of phosphates with the space group R3̄. Its structure is constructed by very regular [with P-O distances ranging from 1.513 (6) to 1.522 (6) Å] PO 4 tetra-hedra and SnO 6 octa-hedra on the 3̄. axis, which are linked by O atoms, forming an [KSn 2(PO 4) 3] framework. The K atoms occupy the . axis sites and are located in the voids of this arrangement. The crystal studied was a merohedral twin with twin law (010 100 001̄ ) and a component ratio of 0.580 (7):0.420 (7).