Materials Data on BaBi4(IO2)2 by Materials Project
BaOBi2O3(BiI)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 four BiI 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 2.76 Å. Bi2+ is bonded to four equivalent O2- atoms to form distorted corner-sharing BiO4 trigonal pyramids. All Bi–O bond lengths are 2.24 Å. O2- is bonded to two equivalent Ba2+ and two equivalent Bi2+ atoms to form a mixture of distorted corner and edge-sharing OBa2Bi2 tetrahedra. In each BiI sheet, Bi2+ is bonded in a 4-coordinate geometry to four equivalent I1- atoms. All Bi–I bond lengths are 3.51 Å. I1- is bonded in a 4-coordinate geometry to four equivalent Bi2+ atoms.