Materials Data on BaBi4(BrO3)2 by Materials Project

Abstract

BaOBi2O3(BiOBr)2 crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two BaOBi2O3 sheets oriented in the (0, 0, 1) direction and two BiOBr sheets oriented in the (0, 0, 1) direction. In each BaOBi2O3 sheet, Ba2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ba–O bond lengths are 2.75 Å. Bi3+ is bonded to four equivalent O2- atoms to form distorted corner-sharing BiO4 trigonal pyramids. All Bi–O bond lengths are 2.22 Å. O2- is bonded to two equivalent Ba2+ and two equivalent Bi3+ atoms to form a mixture of distorted edge and corner-sharing OBa2Bi2 tetrahedra. In each BiOBr sheet, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four equivalent Br1- atoms. All Bi–O bond lengths are 2.36 Å. All Bi–Br bond lengths are 3.26 Å. O2- is bonded to four equivalent Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. Br1- is bonded in a 12-coordinate geometry to four equivalent Bi3+ atoms.