Materials Data on RbHf2Br9 by Materials Project

Abstract

RbHf2Br9 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. Rb1+ is bonded to twelve Br1- atoms to form distorted RbBr12 cuboctahedra that share corners with four equivalent HfBr6 octahedra, edges with four equivalent RbBr12 cuboctahedra, edges with two equivalent HfBr6 octahedra, and faces with two equivalent HfBr6 octahedra. The corner-sharing octahedra tilt angles range from 10–41°. There are a spread of Rb–Br bond distances ranging from 3.78–4.20 Å. Hf4+ is bonded to six Br1- atoms to form HfBr6 octahedra that share corners with two equivalent RbBr12 cuboctahedra, an edgeedge with one RbBr12 cuboctahedra, a faceface with one RbBr12 cuboctahedra, and a faceface with one HfBr6 octahedra. There are a spread of Hf–Br bond distances ranging from 2.50–2.77 Å. There are five inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted single-bond geometry to one Rb1+ and one Hf4+ atom. In the second Br1- site, Br1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one Hf4+ atom. In the third Br1- site, Br1- is bonded in an L-shaped geometry to two equivalent Hf4+ atoms. In the fourth Br1- site, Br1- is bonded in an L-shaped geometry to one Rb1+ and two equivalent Hf4+ atoms. In the fifth Br1- site, Br1- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one Hf4+ atom.