Er5Sn3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to five equivalent Sn(1) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to six equivalent Sn(1) atoms. Sn(1) is bonded in a 9-coordinate geometry to four equivalent Er(2) and five equivalent Er(1) atoms.
Er5Sn3 crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to five equivalent Sn(1) atoms. There are a spread of Er(1)-Sn(1) bond distances ranging from 3.04-3.52 Å. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to six equivalent Sn(1) atoms. All Er(2)-Sn(1) bond lengths are 3.16 Å. Sn(1) is bonded in a 9-coordinate geometry to four equivalent Er(2) and five equivalent Er(1) atoms.