Materials Data on U5Sn4 by Materials Project
U5Sn4 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded in a 8-coordinate geometry to two equivalent U and six equivalent Sn atoms. Both U–U bond lengths are 3.09 Å. All U–Sn bond lengths are 3.33 Å. In the second U site, U is bonded to seven Sn atoms to form a mixture of distorted edge, face, and corner-sharing USn7 pentagonal bipyramids. There are a spread of U–Sn bond distances ranging from 3.12–3.19 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent U and two equivalent Sn atoms. Both Sn–Sn bond lengths are 3.09 Å. In the second Sn site, Sn is bonded in a 9-coordinate geometry to nine U atoms.