Crystal structure of KSbP2O8

Abstract KSbP 2 O 8 crystallizes in the rhombohedral system, space group R 3 , with a = 4.7623(4) A, c = 25.409(4)A, and Z = 3. The structure was determined from 487 reflexions collected on a NONIUS CAD4 automatic diffractometer with Mo K − α radiation. The final R index and weighted R w index are 0.030 and 0.038, respectively. This structure is built up from layers of SbO 6 octahedra and PO 4 tetrahedra sharing corners. These (SbP 2 O − 8 ) n layers are very similar to the (ZrP 2 O 2− 8 ) n layers in the well-known α-ZrP compound.