Materials Data on RbFe(MoO4)2 by Materials Project

Abstract

RbFe(MoO4)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Rb1+ is bonded to twelve O2- atoms to form RbO12 cuboctahedra that share edges with six equivalent RbO12 cuboctahedra, edges with six equivalent MoO4 tetrahedra, and faces with two equivalent FeO6 octahedra. There are six shorter (3.19 Å) and six longer (3.37 Å) Rb–O bond lengths. Mo6+ is bonded to four O2- atoms to form MoO4 tetrahedra that share corners with three equivalent FeO6 octahedra and edges with three equivalent RbO12 cuboctahedra. The corner-sharing octahedral tilt angles are 19°. There is one shorter (1.75 Å) and three longer (1.81 Å) Mo–O bond length. Fe3+ is bonded to six equivalent O2- atoms to form FeO6 octahedra that share corners with six equivalent MoO4 tetrahedra and faces with two equivalent RbO12 cuboctahedra. All Fe–O bond lengths are 2.01 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Rb1+, one Mo6+, and one Fe3+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three equivalent Rb1+ and one Mo6+ atom.