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CeMg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Ce atoms. All Mg–Ce bond lengths are 3.32 Å. Ce is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
Mg3Ce is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Ce atoms. All Mg–Mg bond lengths are 3.20 Å. All Mg–Ce bond lengths are 3.20 Å. In the second Mg site, Mg is bonded in a 8-coordinate geometry to eight equivalent Mg and six equivalent Ce atoms. All Mg–Ce bond lengths are 3.69 Å. Ce is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms.
CeMg2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mg is bonded to six equivalent Mg and six equivalent Ce atoms to form a mixture of corner, edge, and face-sharing MgCe6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.05 Å. All Mg–Ce bond lengths are 3.58 Å. Ce is bonded in a 12-coordinate geometry to twelve equivalent Mg and four equivalent Ce atoms. All Ce–Ce bond lengths are 3.73 Å.
Mg5Ce crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to eight Mg and two equivalent Ce atoms. There are four shorter (3.26 Å) and four longer (3.27 Å) Mg–Mg bond lengths. Both Mg–Ce bond lengths are 3.37 Å. In the second Mg site, Mg is bonded to nine Mg and three equivalent Ce atoms to form MgCe3Mg9 cuboctahedra that share corners with nine equivalent MgCe3Mg9 cuboctahedra, corners with nine equivalent CeMg12 cuboctahedra, edges with six equivalent MgCe3Mg9 cuboctahedra, faces with three equivalent CeMg12 cuboctahedra, and faces with five equivalent MgCe3Mg9 cuboctahedra. All Mg–Mg bond lengths are 3.35 Å. All Mg–Ce bond lengths are 3.35 Å. Ce is bonded to twelve Mg atoms to form CeMg12 cuboctahedra that share corners with eighteen equivalent MgCe3Mg9 cuboctahedra, edges with six equivalent CeMg12 cuboctahedra, faces with two equivalent CeMg12 cuboctahedra, and faces with six equivalent MgCe3Mg9 cuboctahedra.
MgCe3 is beta-derived structured and crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. Mg is bonded to two equivalent Mg and ten Ce atoms to form MgCe10Mg2 cuboctahedra that share corners with four equivalent CeCe8Mg4 cuboctahedra, corners with fourteen equivalent MgCe10Mg2 cuboctahedra, edges with two equivalent MgCe10Mg2 cuboctahedra, edges with sixteen CeCe8Mg4 cuboctahedra, faces with two equivalent MgCe10Mg2 cuboctahedra, and faces with eighteen CeCe8Mg4 cuboctahedra. Both Mg–Mg bond lengths are 3.26 Å. There are a spread of Mg–Ce bond distances ranging from 3.34–3.52 Å. There are two inequivalent Ce sites. In the first Ce site, Ce is bonded to four equivalent Mg and eight Ce atoms to form CeCe8Mg4 cuboctahedra that share corners with four equivalent MgCe10Mg2 cuboctahedra, corners with fourteen equivalent CeCe8Mg4 cuboctahedra, edges with four equivalent MgCe10Mg2 cuboctahedra, edges with fourteen CeCe8Mg4 cuboctahedra, faces with six equivalent MgCe10Mg2 cuboctahedra, and faces with fourteen CeCe8Mg4 cuboctahedra. There are a spread of Ce–Ce bond distances ranging from 3.26–3.48 Å. In the second Ce site, Ce is bonded to three equivalent Mg and nine Ce atoms to form CeCe9Mg3 cuboctahedra that share corners with eighteen equivalent CeCe9Mg3 cuboctahedra, edges with six equivalent MgCe10Mg2 cuboctahedra, edges with twelve CeCe8Mg4 cuboctahedra, faces with six equivalent MgCe10Mg2 cuboctahedra, and faces with fourteen CeCe8Mg4 cuboctahedra. There are two shorter (3.26 Å) and four longer (3.43 Å) Ce–Ce bond lengths.
MgCe2 is alpha Samarium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Mg is bonded to six equivalent Mg and six Ce atoms to form MgCe6Mg6 cuboctahedra that share corners with six equivalent CeCe12 cuboctahedra, corners with twelve equivalent MgCe6Mg6 cuboctahedra, edges with six equivalent MgCe6Mg6 cuboctahedra, edges with twelve CeCe9Mg3 cuboctahedra, faces with seven equivalent MgCe6Mg6 cuboctahedra, and faces with thirteen CeCe12 cuboctahedra. All Mg–Mg bond lengths are 3.14 Å. All Mg–Ce bond lengths are 3.52 Å. There are three inequivalent Ce sites. In the first Ce site, Ce is bonded to twelve Ce atoms to form CeCe12 cuboctahedra that share corners with six equivalent CeCe12 cuboctahedra, corners with twelve equivalent MgCe6Mg6 cuboctahedra, edges with eighteen CeCe12 cuboctahedra, faces with two equivalent MgCe6Mg6 cuboctahedra, and faces with eighteen CeCe12 cuboctahedra. There are six shorter (3.14 Å) and six longer (3.51 Å) Ce–Ce bond lengths. In the second Ce site, Ce is bonded to three equivalent Mg and nine Ce atoms to form CeCe9Mg3 cuboctahedra that share corners with eighteen CeCe9Mg3 cuboctahedra, edges with six equivalent MgCe6Mg6 cuboctahedra, edges with twelve CeCe12 cuboctahedra, faces with six equivalent MgCe6Mg6 cuboctahedra, and faces with fourteen CeCe12 cuboctahedra. All Ce–Ce bond lengths are 3.14 Å. In the third Ce site, Ce is bonded to six equivalent Mg and six equivalent Ce atoms to form CeCe6Mg6 cuboctahedra that share corners with eighteen CeCe9Mg3 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve equivalent MgCe6Mg6 cuboctahedra, faces with eight CeCe9Mg3 cuboctahedra, and faces with twelve equivalent MgCe6Mg6 cuboctahedra. All Ce–Ce bond lengths are 3.14 Å.
CeMg crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Mg is bonded to nine equivalent Mg and three equivalent Ce atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent MgCe3Mg9 cuboctahedra, corners with twelve equivalent CeCe9Mg3 cuboctahedra, edges with six equivalent CeCe9Mg3 cuboctahedra, edges with twelve equivalent MgCe3Mg9 cuboctahedra, faces with eight equivalent CeCe9Mg3 cuboctahedra, and faces with twelve equivalent MgCe3Mg9 cuboctahedra. There are six shorter (3.15 Å) and three longer (3.22 Å) Mg–Mg bond lengths. All Mg–Ce bond lengths are 3.44 Å. Ce is bonded to three equivalent Mg and nine equivalent Ce atoms to form CeCe9Mg3 cuboctahedra that share corners with six equivalent CeCe9Mg3 cuboctahedra, corners with twelve equivalent MgCe3Mg9 cuboctahedra, edges with six equivalent MgCe3Mg9 cuboctahedra, edges with twelve equivalent CeCe9Mg3 cuboctahedra, faces with eight equivalent MgCe3Mg9 cuboctahedra, and faces with twelve equivalent CeCe9Mg3 cuboctahedra. There are six shorter (3.15 Å) and three longer (3.61 Å) Ce–Ce bond lengths.