Materials Data on Al3Bi5Br12 by Materials Project
(Bi)5(AlBr4)3 is Iron carbide-derived structured and crystallizes in the trigonal R-3c space group. The structure is zero-dimensional and consists of eighteen AlBr4 clusters and six Bi clusters. In each AlBr4 cluster, Al is bonded in a tetrahedral geometry to four Br atoms. There are two shorter (2.32 Å) and two longer (2.34 Å) Al–Br bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded in a single-bond geometry to one Al atom. In the second Br site, Br is bonded in a single-bond geometry to one Al atom. In each Bi cluster, there are two inequivalent Bi sites. In the first Bi site, Bi is bonded in a 6-coordinate geometry to three equivalent Bi atoms. All Bi–Bi bond lengths are 3.09 Å. In the second Bi site, Bi is bonded in a 4-coordinate geometry to four Bi atoms. Both Bi–Bi bond lengths are 3.24 Å.