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Dipotassium [nickel(II) zirconium(IV)] tris­(orthophosphate) was prepared from a self-flux in the system K 2 O–P 2 O 5 –NiO–K 2 ZrF 6 . The title compound belongs to the langbeinite family and is built up from two [ M O 6 ] octa­hedra [ M  = Ni:Zr with mixed occupancy in ratios of 0.21 (4):0.79 (4) and 0.29 (4):0.71 (4), respectively] and [PO 4 ] tetra­hedra inter­linked  via  vertices into a  3   ∞ [ M   2 (PO 4 ) 3 ] framework. Two independent K +  cations are located in large cavities of the framework, with coordination numbers to O 2−  anions of nine and twelve. The K, Ni, and Zr sites are located on threefold rotation axes.

Rietveld refinement of the langbeinite-type mixed-metal phosphate K2Ni0.5Zr1.5(PO4)3

Rietveld refinement of the langbeinite-type mixed-metal phosphate K₂Ni_0.5Zr_1.5(PO₄)₃