Crystal structure of a new tripotassium hexa­nickel iron hexa­phosphate

A new potassium-nickel iron phosphate, K(3)Ni(6)Fe(PO(4))(6), has been synthesized by solid-state reaction and structurally characterized by single-crystal X-ray diffraction and qualitative energy dispersive X-ray spectroscopy (EDS) analysis. The structure is built up by [FeO(6)], [PO(4)], and [NiO(6)] coordination polyhedra, which are linked to each other by edge and corner sharing to form zigzag layers parallel to the ab plane. These layers are inter­connected by [PO(4)] tetra­hedra and [NiO(6)] octa­hedra via common corners, leading to a three-dimensional framework delimiting large channels running along the [100] direction in which the K(+) cations are localized.