Crystal Structure of a Novel Iron-Cobalt Phosphate Fluoride

Abstract

A mixed-transitional metal phosphate fluoride containing iron and cobalt in a 1 : 1 ratio, FeCo (PO₄) F, has been synthesized by hydrothermal means and structurally characterized via single crystal X-ray diffraction. Along the c axis of the structure, corner-sharing Fe (1) O₄F and Fe (2) O₄F trigonal bipyramids link via oxygen bridges to form chains, while Co (1) O₄F₂ octahedra and Co (2) O₄F trigonal bipyramids connect each other to form chains by sharing the common edge of O…F and the corner of O alternately. The chains of Fe and Co coordination polyhedra are further connected via oxygen and fluorine bridges, as well as phosphate groups to give a three-dimensional framework structure.