Materials Data on Fe2Sb(PO4)3 by Materials Project

Abstract

Fe2Sb(PO4)3 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six equivalent PO4 tetrahedra. There are three shorter (1.93 Å) and three longer (2.13 Å) Fe–O bond lengths. Sb3+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Sb–O bond lengths are 2.34 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 29–46°. There is two shorter (1.53 Å) and two longer (1.57 Å) P–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Fe3+ and one P5+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Fe3+, one Sb3+, and one P5+ atom.