Crystal structure of a new tripotassium hexanickel iron hexaphosphate

Abstract

A new potassium-nickel iron phosphate, K3Ni6Fe(PO4)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 [FeO6], [PO4], and [NiO6] 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 [PO4] tetrahedra and [NiO6] 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.

Crystal structure of SrCo4(OH)(PO4)3, a new hydroxyphosphate

“…The search for new inorganic materials with open-frame structures comprising transition-metal polyhedra, [MO x ], with tetrahedral phosphate or vanadate units by sharing corners or edges is still ongoing (Rghioui et al, 2019;Ouaatta et al, 2019;Khmiyas et al, 2020). Generally, these interconnections can lead to structures with cages, interlayer spaces or channels, and the corresponding compounds are explored extensively for their excellent physical properties and various applications in electrical, electrochemical, magnetic or catalytic processes (Goodenough et al, 1976;Borel et al, 1991;La Parola et al, 2018;Hadouchi et al, 2019).…”