CeCo8Mn4 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded to eight equivalent Mn(1), four equivalent Co(1), and eight equivalent Co(2) atoms to form a mixture of distorted face and corner-sharing CeMn8Co12 cuboctahedra. Mn(1) is bonded in a 10-coordinate geometry to two equivalent Ce(1), two equivalent Mn(1), four equivalent Co(1), and four equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Ce(1), four equivalent Mn(1), four equivalent Co(2), and five equivalent Co(1) atoms. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Mn(1), two equivalent Co(2), and four equivalent Co(1) atoms.
CeCo8Mn4 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded to eight equivalent Mn(1), four equivalent Co(1), and eight equivalent Co(2) atoms to form a mixture of distorted face and corner-sharing CeMn8Co12 cuboctahedra. All Ce(1)-Mn(1) bond lengths are 3.18 Å. All Ce(1)-Co(1) bond lengths are 3.00 Å. All Ce(1)-Co(2) bond lengths are 2.97 Å. Mn(1) is bonded in a 10-coordinate geometry to two equivalent Ce(1), two equivalent Mn(1), four equivalent Co(1), and four equivalent Co(2) atoms. Both Mn(1)-Mn(1) bond lengths are 2.28 Å. All Mn(1)-Co(1) bond lengths are 2.55 Å. All Mn(1)-Co(2) bond lengths are 2.39 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to one Ce(1), four equivalent Mn(1), four equivalent Co(2), and five equivalent Co(1) atoms. There are two shorter (2.52 Å) and two longer (2.58 Å) Co(1)-Co(2) bond lengths. There is one shorter (2.39 Å) and four longer (2.84 Å) Co(1)-Co(1) bond lengths. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), four equivalent Mn(1), two equivalent Co(2), and four equivalent Co(1) atoms. Both Co(2)-Co(2) bond lengths are 2.70 Å.