Materials Data on Rb4Br2O by Materials Project
Rb4OBr2 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to one O2- and five equivalent Br1- atoms. The Rb–O bond length is 2.72 Å. There are one shorter (3.54 Å) and four longer (3.92 Å) Rb–Br bond lengths. In the second Rb1+ site, Rb1+ is bonded in a distorted linear geometry to two equivalent O2- and four equivalent Br1- atoms. Both Rb–O bond lengths are 2.77 Å. All Rb–Br bond lengths are 3.74 Å. O2- is bonded to six Rb1+ atoms to form corner-sharing ORb6 octahedra. The corner-sharing octahedral tilt angles are 0°. Br1- is bonded in a 9-coordinate geometry to nine Rb1+ atoms.