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The title compound, CaNi 2 Fe(PO 4 ) 3 , was synthesized by solid-state reactions. Its structure is closely related to that of α-CrPO 4 in the space group Imma . Except for two O atoms in general positions, all atoms are located in special positions. The three-dimensional framework is built up from two types of sheets extending parallel to (100). The first sheet is made up from two edge-sharing [NiO 6 ] octa-hedra, leading to the formation of [Ni 2 O 10 ] double octa-hedra that are connected to two PO 4 tetra-hedra through a common edge and corners. The second sheet results from rows of corner-sharing [FeO 6 ] octa-hedra and PO 4 tetra-hedra forming an infinite linear chain. These layers are linked together through common corners of PO 4 tetra-hedra and [FeO 6 ] octa-hedra, resulting in an open three-dimensional framework that delimits two types of channels parallel to [100] and [010] in which the eightfold-coordinated Ca II cations are located.

Crystal structure of calcium dinickel(II) iron(III) tris(orthophosphate): CaNi2Fe(PO4)3

Crystal structure of calcium dinickel(II) iron(III) tris(orthophosphate): CaNi₂Fe(PO₄)₃