Mg5Ce is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2), six equivalent Mg(1), and three equivalent Ce(1) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(2)Mg12 cuboctahedra, edges with six equivalent Ce(1)Ce6Mg6 cuboctahedra,  a faceface with one Mg(3)Mg12 cuboctahedra, faces with six equivalent Mg(2)Mg12 cuboctahedra, faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra, and faces with seven equivalent Mg(1)Ce3Mg9 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1), three equivalent Mg(3), and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(2)Mg12 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce6Mg6 cuboctahedra; faces with six equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with seven Mg(2,2)Mg12 cuboctahedra. In the third Mg site, Mg(3) is bonded to six Mg(2,2) and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra; corners with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra; edges with twelve Mg(2,2)Mg12 cuboctahedra; faces with two equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with twelve Mg(2,2)Mg12 cuboctahedra. In the fourth Mg site, Mg(2) is bonded to three equivalent Mg(1), three equivalent Mg(3), and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(2)Mg12 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce6Mg6 cuboctahedra; faces with six equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with seven Mg(2,2)Mg12 cuboctahedra. Ce(1) is bonded to six equivalent Mg(1) and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Ce(1)Ce6Mg6 cuboctahedra; edges with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with two Mg(2,2)Mg12 cuboctahedra; faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra; and faces with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra.
Mg5Ce is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2), six equivalent Mg(1), and three equivalent Ce(1) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(2)Mg12 cuboctahedra, edges with six equivalent Ce(1)Ce6Mg6 cuboctahedra,  a faceface with one Mg(3)Mg12 cuboctahedra, faces with six equivalent Mg(2)Mg12 cuboctahedra, faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra, and faces with seven equivalent Mg(1)Ce3Mg9 cuboctahedra. All Mg(1)-Mg(2) bond lengths are 3.15 Å. All Mg(1)-Mg(1) bond lengths are 3.15 Å. All Mg(1)-Ce(1) bond lengths are 3.46 Å. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1), three equivalent Mg(3), and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(2)Mg12 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce6Mg6 cuboctahedra; faces with six equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with seven Mg(2,2)Mg12 cuboctahedra. All Mg(2)-Mg(3) bond lengths are 3.16 Å. All Mg(2)-Mg(2) bond lengths are 3.15 Å. In the third Mg site, Mg(3) is bonded to six Mg(2,2) and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra; corners with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra; edges with twelve Mg(2,2)Mg12 cuboctahedra; faces with two equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with twelve Mg(2,2)Mg12 cuboctahedra. All Mg(3)-Mg(2) bond lengths are 3.16 Å. All Mg(3)-Mg(3) bond lengths are 3.15 Å. In the fourth Mg site, Mg(2) is bonded to three equivalent Mg(1), three equivalent Mg(3), and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(2)Mg12 cuboctahedra; edges with six equivalent Mg(3)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce6Mg6 cuboctahedra; faces with six equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with six equivalent Mg(3)Mg12 cuboctahedra; and faces with seven Mg(2,2)Mg12 cuboctahedra. All Mg(2)-Mg(1) bond lengths are 3.15 Å. All Mg(2)-Mg(2) bond lengths are 3.15 Å. Ce(1) is bonded to six equivalent Mg(1) and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra; corners with twelve Mg(2,2)Mg12 cuboctahedra; edges with six equivalent Ce(1)Ce6Mg6 cuboctahedra; edges with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra; faces with two Mg(2,2)Mg12 cuboctahedra; faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra; and faces with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra. All Ce(1)-Ce(1) bond lengths are 3.15 Å.