Er5Ir3 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 6-coordinate geometry to six equivalent Ir(1) atoms. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to five equivalent Ir(1) atoms. Ir(1) is bonded in a 9-coordinate geometry to four equivalent Er(1) and five equivalent Er(2) atoms.
Er5Ir3 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 6-coordinate geometry to six equivalent Ir(1) atoms. All Er(1)-Ir(1) bond lengths are 2.99 Å. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to five equivalent Ir(1) atoms. There are a spread of Er(2)-Ir(1) bond distances ranging from 2.84-3.25 Å. Ir(1) is bonded in a 9-coordinate geometry to four equivalent Er(1) and five equivalent Er(2) atoms.