Materials Data on Cs2HgAsBr6 by Materials Project

Abstract

Cs2HgAsBr6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent Br1- atoms to form CsBr12 cuboctahedra that share corners with twelve equivalent CsBr12 cuboctahedra, faces with six equivalent CsBr12 cuboctahedra, faces with four equivalent HgBr6 octahedra, and faces with four equivalent AsBr6 octahedra. All Cs–Br bond lengths are 4.01 Å. Hg2+ is bonded to six equivalent Br1- atoms to form HgBr6 octahedra that share corners with six equivalent AsBr6 octahedra and faces with eight equivalent CsBr12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Hg–Br bond lengths are 2.97 Å. As2+ is bonded to six equivalent Br1- atoms to form AsBr6 octahedra that share corners with six equivalent HgBr6 octahedra and faces with eight equivalent CsBr12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All As–Br bond lengths are 2.69 Å. Br1- is bonded to four equivalent Cs1+, one Hg2+, and one As2+ atom to form a mixture of distorted face, edge, and corner-sharing BrCs4HgAs octahedra. The corner-sharing octahedra tilt angles range from 0–60°.