CeMg2 is Magnesium-derived structured and crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Ce(1) atoms to form MgCe4Mg8 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with three equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with seven equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Ce4Mg8 cuboctahedra, faces with six equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with six equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with eight equivalent Ce(1)Ce6Mg6 cuboctahedra. In the second Mg site, Mg(2) is bonded to four equivalent Mg(2), six equivalent Mg(1), and two equivalent Ce(1) atoms to form MgCe2Mg10 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with seven equivalent Mg(1)Ce4Mg8 cuboctahedra, edges with eleven equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with four equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with six equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with ten equivalent Mg(2)Ce2Mg10 cuboctahedra. Ce(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with three equivalent Mg(1)Ce4Mg8 cuboctahedra, edges with four equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with eleven equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with four equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with eight equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with eight equivalent Ce(1)Ce6Mg6 cuboctahedra.
CeMg2 is Magnesium-derived structured and crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Ce(1) atoms to form MgCe4Mg8 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with three equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with seven equivalent Mg(2)Ce2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Ce4Mg8 cuboctahedra, faces with six equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with six equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with eight equivalent Ce(1)Ce6Mg6 cuboctahedra. Both Mg(1)-Mg(1) bond lengths are 3.13 Å. There are four shorter (3.11 Å) and two longer (3.22 Å) Mg(1)-Mg(2) bond lengths. There are two shorter (3.34 Å) and two longer (3.50 Å) Mg(1)-Ce(1) bond lengths. In the second Mg site, Mg(2) is bonded to four equivalent Mg(2), six equivalent Mg(1), and two equivalent Ce(1) atoms to form MgCe2Mg10 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with seven equivalent Mg(1)Ce4Mg8 cuboctahedra, edges with eleven equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with four equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with six equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with ten equivalent Mg(2)Ce2Mg10 cuboctahedra. There are two shorter (3.13 Å) and two longer (3.28 Å) Mg(2)-Mg(2) bond lengths. Both Mg(2)-Ce(1) bond lengths are 3.53 Å. Ce(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent Mg(2)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(1)Ce4Mg8 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with three equivalent Mg(1)Ce4Mg8 cuboctahedra, edges with four equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with eleven equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with four equivalent Mg(2)Ce2Mg10 cuboctahedra, faces with eight equivalent Mg(1)Ce4Mg8 cuboctahedra, and faces with eight equivalent Ce(1)Ce6Mg6 cuboctahedra. There are four shorter (3.06 Å) and two longer (3.13 Å) Ce(1)-Ce(1) bond lengths.