Results for “Br-Rb-W” | Engineering Papers

DOE OSTI2020

Materials Data on Rb2WBr6 by Materials Project

Rb2WBr6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Rb1+ is bonded to twelve equivalent Br1- atoms to form RbBr12 cuboctahedra that share corners with twelve equivalent RbBr12 cuboctahedra, faces with six equivalent RbBr12 cuboctahedra, and faces with four equivalent WBr6 octahedra. All Rb–Br bond lengths are 3.82 Å. W4+ is bonded to six equivalent Br1- atoms to form WBr6 octahedra that share faces with eight equivalent RbBr12 cuboctahedra. All W–Br bond lengths are 2.56 Å. Br1- is bonded to four equivalent Rb1+ and one W4+ atom to form a mixture of distorted corner, edge, and face-sharing BrRb4W square pyramids.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on RbW3Br7 by Materials Project

RbW3Br7 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded to six Br1- atoms to form distorted RbBr6 pentagonal pyramids that share corners with six WBr5 square pyramids and edges with two equivalent RbBr6 pentagonal pyramids. There are a spread of Rb–Br bond distances ranging from 3.55–3.63 Å. In the second Rb1+ site, Rb1+ is bonded in a square co-planar geometry to four equivalent Br1- atoms. There are two shorter (3.37 Å) and two longer (3.47 Å) Rb–Br bond lengths. There are three inequivalent W2+ sites. In the first W2+ site, W2+ is bonded to five Br1- atoms to form edge-sharing WBr5 square pyramids. There are a spread of W–Br bond distances ranging from 2.65–2.67 Å. In the second W2+ site, W2+ is bonded to five Br1- atoms to form WBr5 square pyramids that share a cornercorner with one RbBr6 pentagonal pyramid and edges with four WBr5 square pyramids. There are a spread of W–Br bond distances ranging from 2.61–2.66 Å. In the third W2+ site, W2+ is bonded to five Br1- atoms to form WBr5 square pyramids that share corners with two equivalent RbBr6 pentagonal pyramids and edges with four WBr5 square pyramids. There are a spread of W–Br bond distances ranging from 2.64–2.67 Å. There are seven inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 12-coordinate geometry to three W2+ atoms. In the second Br1- site, Br1- is bonded in a 12-coordinate geometry to three W2+ atoms. In the third Br1- site, Br1- is bonded in a 4-coordinate geometry to three W2+ atoms. In the fourth Br1- site, Br1- is bonded in a 12-coordinate geometry to three W2+ atoms. In the fifth Br1- site, Br1- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Rb1+ and one W2+ atom. In the sixth Br1- site, Br1- is bonded in a distorted bent 120 degrees geometry to one Rb1+ and one W2+ atom. In the seventh Br1- site, Br1- is bonded in a 3-coordinate geometry to two equivalent Rb1+ and one W2+ atom.

36 MATERIALS SCIENCE↗