Materials Data on La10Al5Br4 by Materials Project

Abstract

La10Al5Br4 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are three inequivalent La sites. In the first La site, La is bonded in a 1-coordinate geometry to five Al and one Br atom. There are one shorter (3.26 Å) and four longer (3.35 Å) La–Al bond lengths. The La–Br bond length is 3.22 Å. In the second La site, La is bonded in a 8-coordinate geometry to three equivalent Al and five Br atoms. There are one shorter (3.23 Å) and two longer (3.24 Å) La–Al bond lengths. There are a spread of La–Br bond distances ranging from 3.11–3.54 Å. In the third La site, La is bonded to five Al atoms to form a mixture of distorted corner and edge-sharing LaAl5 trigonal bipyramids. There are a spread of La–Al bond distances ranging from 3.33–3.45 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to eight La and one Al atom. The Al–Al bond length is 2.79 Å. In the second Al site, Al is bonded in a distorted q6 geometry to ten La atoms. There are two inequivalent Br sites. In the first Br site, Br is bonded in a 6-coordinate geometry to six equivalent La atoms. In the second Br site, Br is bonded to five La atoms to form corner-sharing BrLa5 square pyramids.