ErCu4In crystallizes in the cubic F-43m space group. Er(1) is bonded in a 16-coordinate geometry to twelve equivalent Cu(1) and four equivalent In(1) atoms. Cu(1) is bonded to three equivalent Er(1), six equivalent Cu(1), and three equivalent In(1) atoms to form a mixture of corner, face, and edge-sharing CuEr3In3Cu6 cuboctahedra. In(1) is bonded in a 16-coordinate geometry to four equivalent Er(1) and twelve equivalent Cu(1) atoms.
ErCu4In crystallizes in the cubic F-43m space group. Er(1) is bonded in a 16-coordinate geometry to twelve equivalent Cu(1) and four equivalent In(1) atoms. All Er(1)-Cu(1) bond lengths are 2.96 Å. All Er(1)-In(1) bond lengths are 3.09 Å. Cu(1) is bonded to three equivalent Er(1), six equivalent Cu(1), and three equivalent In(1) atoms to form a mixture of corner, face, and edge-sharing CuEr3In3Cu6 cuboctahedra. There are three shorter (2.52 Å) and three longer (2.53 Å) Cu(1)-Cu(1) bond lengths. All Cu(1)-In(1) bond lengths are 2.96 Å. In(1) is bonded in a 16-coordinate geometry to four equivalent Er(1) and twelve equivalent Cu(1) atoms.