Materials Data on RbCoBr3 by Materials Project

Abstract

RbCoBr3 crystallizes in the hexagonal P6_3cm space group. The structure is three-dimensional. Rb1+ is bonded to twelve Br1- atoms to form RbBr12 cuboctahedra that share corners with six equivalent RbBr12 cuboctahedra, corners with six CoBr6 octahedra, faces with eight equivalent RbBr12 cuboctahedra, and faces with six CoBr6 octahedra. The corner-sharing octahedra tilt angles range from 14–18°. There are a spread of Rb–Br bond distances ranging from 3.70–4.05 Å. There are two inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded to six equivalent Br1- atoms to form CoBr6 octahedra that share corners with six equivalent RbBr12 cuboctahedra, faces with six equivalent RbBr12 cuboctahedra, and faces with two equivalent CoBr6 octahedra. There are three shorter (2.57 Å) and three longer (2.59 Å) Co–Br bond lengths. In the second Co2+ site, Co2+ is bonded to six equivalent Br1- atoms to form CoBr6 octahedra that share corners with six equivalent RbBr12 cuboctahedra, faces with six equivalent RbBr12 cuboctahedra, and faces with two equivalent CoBr6 octahedra. All Co–Br bond lengths are 2.58 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 6-coordinate geometry to four equivalent Rb1+ and two equivalent Co2+ atoms. In the second Br1- site, Br1- is bonded in a 6-coordinate geometry to four equivalent Rb1+ and two equivalent Co2+ atoms.