Materials Data on CsSeBr3 by Materials Project
CsSeBr3 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Cs is bonded in a 9-coordinate geometry to two equivalent Se and seven Br atoms. Both Cs–Se bond lengths are 4.06 Å. There are a spread of Cs–Br bond distances ranging from 3.67–4.19 Å. Se is bonded in a distorted square co-planar geometry to two equivalent Cs and four Br atoms. There are two shorter (2.61 Å) and two longer (2.64 Å) Se–Br bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded in a distorted bent 120 degrees geometry to one Cs and two equivalent Se atoms. In the second Br site, Br is bonded to three equivalent Cs and one Se atom to form a mixture of distorted edge and corner-sharing BrCs3Se trigonal pyramids.