Materials Data on CsGeBr3 by Materials Project

Abstract

CsGeBr3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. Cs1+ is bonded to twelve Br1- atoms to form CsBr12 cuboctahedra that share corners with twelve equivalent CsBr12 cuboctahedra, faces with six equivalent CsBr12 cuboctahedra, and faces with eight equivalent GeBr6 octahedra. There are a spread of Cs–Br bond distances ranging from 3.98–4.24 Å. Ge2+ is bonded to six Br1- atoms to form GeBr6 octahedra that share corners with six equivalent GeBr6 octahedra and faces with eight equivalent CsBr12 cuboctahedra. The corner-sharing octahedra tilt angles range from 7–13°. There are a spread of Ge–Br bond distances ranging from 2.57–3.22 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 6-coordinate geometry to four equivalent Cs1+ and two equivalent Ge2+ atoms. In the second Br1- site, Br1- is bonded in a 1-coordinate geometry to four equivalent Cs1+ and two equivalent Ge2+ atoms.