ErRhIn crystallizes in the hexagonal P-62m space group. Er(1) is bonded in a 11-coordinate geometry to one Rh(2), four equivalent Rh(1), and six equivalent In(1) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(2) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent In(1) atoms. In the second Rh site, Rh(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent In(1) atoms. In(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), two equivalent Rh(1), and two equivalent Rh(2) atoms.
ErRhIn crystallizes in the hexagonal P-62m space group. Er(1) is bonded in a 11-coordinate geometry to one Rh(2), four equivalent Rh(1), and six equivalent In(1) atoms. The Er(1)-Rh(2) bond length is 3.01 Å. All Er(1)-Rh(1) bond lengths are 2.98 Å. There are two shorter (3.17 Å) and four longer (3.28 Å) Er(1)-In(1) bond lengths. There are two inequivalent Rh sites. In the first Rh site, Rh(2) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent In(1) atoms. All Rh(2)-In(1) bond lengths are 2.73 Å. In the second Rh site, Rh(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent In(1) atoms. All Rh(1)-In(1) bond lengths are 2.80 Å. In(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), two equivalent Rh(1), and two equivalent Rh(2) atoms.