Ce5Ir4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 7-coordinate geometry to one Ir(3), two equivalent Ir(1), and four equivalent Ir(2) atoms. In the second Ce site, Ce(2) is bonded to two equivalent Ir(1), two equivalent Ir(2), and two equivalent Ir(3) atoms to form distorted corner-sharing CeIr6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the third Ce site, Ce(3) is bonded in a 6-coordinate geometry to one Ir(1), two equivalent Ir(3), and three equivalent Ir(2) atoms. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), four equivalent Ce(1), and one Ir(3) atom. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to one Ce(2), three equivalent Ce(3), and four equivalent Ce(1) atoms. In the third Ir site, Ir(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), four equivalent Ce(3), and one Ir(1) atom.
Ce5Ir4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 7-coordinate geometry to one Ir(3), two equivalent Ir(1), and four equivalent Ir(2) atoms. The Ce(1)-Ir(3) bond length is 3.28 Å. There is one shorter (3.03 Å) and one longer (3.33 Å) Ce(1)-Ir(1) bond length. There are a spread of Ce(1)-Ir(2) bond distances ranging from 2.89-3.27 Å. In the second Ce site, Ce(2) is bonded to two equivalent Ir(1), two equivalent Ir(2), and two equivalent Ir(3) atoms to form distorted corner-sharing CeIr6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. There is one shorter (2.74 Å) and one longer (2.89 Å) Ce(2)-Ir(1) bond length. Both Ce(2)-Ir(2) bond lengths are 3.18 Å. There is one shorter (2.87 Å) and one longer (3.21 Å) Ce(2)-Ir(3) bond length. In the third Ce site, Ce(3) is bonded in a 6-coordinate geometry to one Ir(1), two equivalent Ir(3), and three equivalent Ir(2) atoms. The Ce(3)-Ir(1) bond length is 3.02 Å. There is one shorter (2.91 Å) and one longer (2.96 Å) Ce(3)-Ir(3) bond length. There are a spread of Ce(3)-Ir(2) bond distances ranging from 2.81-2.99 Å. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), four equivalent Ce(1), and one Ir(3) atom. The Ir(1)-Ir(3) bond length is 2.80 Å. In the second Ir site, Ir(2) is bonded in a 8-coordinate geometry to one Ce(2), three equivalent Ce(3), and four equivalent Ce(1) atoms. In the third Ir site, Ir(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), four equivalent Ce(3), and one Ir(1) atom.