Ce9CuIn2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to four equivalent Ce(2), four equivalent Ce(3), and four equivalent In(1) atoms. In the second Ce site, Ce(2) is bonded in a 11-coordinate geometry to one Ce(1), two equivalent Ce(2), four equivalent Ce(3), two equivalent Cu(1), and two equivalent In(1) atoms. In the third Ce site, Ce(3) is bonded in a 10-coordinate geometry to one Ce(1), two equivalent Ce(3), four equivalent Ce(2), and three equivalent In(1) atoms. Cu(1) is bonded in a 8-coordinate geometry to eight equivalent Ce(2) atoms. In(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), and six equivalent Ce(3) atoms.
Ce9CuIn2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 4-coordinate geometry to four equivalent Ce(2), four equivalent Ce(3), and four equivalent In(1) atoms. All Ce(1)-Ce(2) bond lengths are 3.50 Å. All Ce(1)-Ce(3) bond lengths are 3.17 Å. All Ce(1)-In(1) bond lengths are 3.32 Å. In the second Ce site, Ce(2) is bonded in a 11-coordinate geometry to one Ce(1), two equivalent Ce(2), four equivalent Ce(3), two equivalent Cu(1), and two equivalent In(1) atoms. Both Ce(2)-Ce(2) bond lengths are 2.88 Å. There are two shorter (3.19 Å) and two longer (3.34 Å) Ce(2)-Ce(3) bond lengths. Both Ce(2)-Cu(1) bond lengths are 3.45 Å. Both Ce(2)-In(1) bond lengths are 3.64 Å. In the third Ce site, Ce(3) is bonded in a 10-coordinate geometry to one Ce(1), two equivalent Ce(3), four equivalent Ce(2), and three equivalent In(1) atoms. There is one shorter (2.70 Å) and one longer (2.87 Å) Ce(3)-Ce(3) bond length. There is one shorter (3.37 Å) and two longer (3.61 Å) Ce(3)-In(1) bond lengths. Cu(1) is bonded in a 8-coordinate geometry to eight equivalent Ce(2) atoms. In(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), and six equivalent Ce(3) atoms.