ErIrSn crystallizes in the hexagonal P-62m space group. Er(1) is bonded in a 11-coordinate geometry to one Ir(2), four equivalent Ir(1), and six equivalent Sn(1) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(2) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent Sn(1) atoms. In the second Ir site, Ir(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Sn(1) atoms. Sn(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), two equivalent Ir(1), and two equivalent Ir(2) atoms.
ErIrSn crystallizes in the hexagonal P-62m space group. Er(1) is bonded in a 11-coordinate geometry to one Ir(2), four equivalent Ir(1), and six equivalent Sn(1) atoms. The Er(1)-Ir(2) bond length is 3.01 Å. All Er(1)-Ir(1) bond lengths are 2.98 Å. There are two shorter (3.15 Å) and four longer (3.28 Å) Er(1)-Sn(1) bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir(2) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent Sn(1) atoms. All Ir(2)-Sn(1) bond lengths are 2.75 Å. In the second Ir site, Ir(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Sn(1) atoms. All Ir(1)-Sn(1) bond lengths are 2.78 Å. Sn(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), two equivalent Ir(1), and two equivalent Ir(2) atoms.