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DOE OSTI2020

Materials Data on CeMg2 by Materials Project

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.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is alpha Samarium-derived structured and crystallizes in the hexagonal P6_3/mmc 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 CeCe6Mg6 cuboctahedra, corners with twelve equivalent MgCe3Mg9 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve equivalent MgCe3Mg9 cuboctahedra, faces with seven equivalent CeCe6Mg6 cuboctahedra, and faces with thirteen equivalent MgCe3Mg9 cuboctahedra. There are six shorter (3.14 Å) and three longer (3.27 Å) Mg–Mg bond lengths. All Mg–Ce bond lengths are 3.45 Å. Ce is bonded to six equivalent Mg and six equivalent Ce atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent CeCe6Mg6 cuboctahedra, corners with twelve equivalent MgCe3Mg9 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve equivalent MgCe3Mg9 cuboctahedra, faces with six equivalent CeCe6Mg6 cuboctahedra, and faces with fourteen equivalent MgCe3Mg9 cuboctahedra. All Ce–Ce bond lengths are 3.14 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is alpha Samarium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with six equivalent MgMg12 cuboctahedra, corners with twelve CeCe6Mg6 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, faces with two CeCe6Mg6 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are six shorter (3.14 Å) and six longer (3.23 Å) Mg–Mg bond lengths. In the second Mg site, Mg is bonded to nine Mg and three equivalent Ce atoms to form MgCe3Mg9 cuboctahedra that share corners with eighteen MgCe3Mg9 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve MgMg12 cuboctahedra, faces with six equivalent CeCe6Mg6 cuboctahedra, and faces with fourteen MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.14 Å. All Mg–Ce bond lengths are 3.44 Å. In the third Mg site, Mg is bonded to six equivalent Mg and six Ce atoms to form MgCe6Mg6 cuboctahedra that share corners with eighteen MgCe3Mg9 cuboctahedra, edges with six equivalent MgCe6Mg6 cuboctahedra, edges with twelve CeCe6Mg6 cuboctahedra, faces with eight MgCe3Mg9 cuboctahedra, and faces with twelve CeCe6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.14 Å. All Mg–Ce bond lengths are 3.47 Å. There are two inequivalent Ce sites. In the first Ce site, Ce is bonded to six Mg and six equivalent Ce atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent MgMg12 cuboctahedra, corners with twelve CeCe6Mg6 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve MgCe3Mg9 cuboctahedra, faces with seven CeCe6Mg6 cuboctahedra, and faces with thirteen MgMg12 cuboctahedra. All Ce–Ce bond lengths are 3.14 Å. In the second Ce site, Ce is bonded to six Mg and six equivalent Ce atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent MgMg12 cuboctahedra, corners with twelve CeCe6Mg6 cuboctahedra, edges with six equivalent CeCe6Mg6 cuboctahedra, edges with twelve MgCe3Mg9 cuboctahedra, faces with seven CeCe6Mg6 cuboctahedra, and faces with thirteen MgMg12 cuboctahedra. All Ce–Mg bond lengths are 3.44 Å. All Ce–Ce bond lengths are 3.14 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to seven Mg and five equivalent Ce atoms to form MgCe5Mg7 cuboctahedra that share corners with six equivalent MgCe5Mg7 cuboctahedra, corners with six equivalent CeCe3Mg9 cuboctahedra, edges with five equivalent CeCe3Mg9 cuboctahedra, edges with six equivalent MgCe5Mg7 cuboctahedra, faces with five equivalent MgCe5Mg7 cuboctahedra, and faces with eight equivalent CeCe3Mg9 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.10–3.18 Å. There are a spread of Mg–Ce bond distances ranging from 3.40–3.66 Å. In the second Mg site, Mg is bonded in a 11-coordinate geometry to seven Mg and four equivalent Ce atoms. There are two shorter (3.18 Å) and two longer (3.25 Å) Mg–Mg bond lengths. There are two shorter (3.44 Å) and two longer (3.47 Å) Mg–Ce bond lengths. Ce is bonded to nine Mg and three equivalent Ce atoms to form distorted CeCe3Mg9 cuboctahedra that share corners with six equivalent MgCe5Mg7 cuboctahedra, corners with six equivalent CeCe3Mg9 cuboctahedra, edges with four equivalent CeCe3Mg9 cuboctahedra, edges with five equivalent MgCe5Mg7 cuboctahedra, faces with six equivalent CeCe3Mg9 cuboctahedra, and faces with eight equivalent MgCe5Mg7 cuboctahedra. There are one shorter (2.71 Å) and two longer (3.18 Å) Ce–Ce bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is alpha Samarium-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with six equivalent CeCe9Mg3 cuboctahedra, corners with twelve MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one CeCe9Mg3 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.11–3.18 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 six equivalent CeCe9Mg3 cuboctahedra, corners with twelve MgCe3Mg9 cuboctahedra, edges with six equivalent CeCe9Mg3 cuboctahedra, edges with twelve MgMg12 cuboctahedra, faces with seven equivalent CeCe9Mg3 cuboctahedra, and faces with thirteen MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. All Mg–Ce bond lengths are 3.44 Å. In the third Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with six equivalent CeCe9Mg3 cuboctahedra, corners with twelve MgCe3Mg9 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one CeCe9Mg3 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are three shorter (3.11 Å) and six longer (3.18 Å) Mg–Mg bond lengths. 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 MgMg12 cuboctahedra, edges with six equivalent MgCe3Mg9 cuboctahedra, edges with twelve equivalent CeCe9Mg3 cuboctahedra, faces with eight MgMg12 cuboctahedra, and faces with twelve equivalent CeCe9Mg3 cuboctahedra. There are six shorter (3.18 Å) and three longer (3.52 Å) Ce–Ce bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Mg is bonded to seven equivalent Mg and five equivalent Ce atoms to form distorted MgCe5Mg7 cuboctahedra that share corners with six equivalent CeCe2Mg10 cuboctahedra, corners with twelve equivalent MgCe5Mg7 cuboctahedra, edges with four equivalent CeCe2Mg10 cuboctahedra, edges with fourteen equivalent MgCe5Mg7 cuboctahedra, faces with eight equivalent CeCe2Mg10 cuboctahedra, and faces with twelve equivalent MgCe5Mg7 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.14–3.46 Å. There are a spread of Mg–Ce bond distances ranging from 3.31–3.48 Å. Ce is bonded to ten equivalent Mg and two equivalent Ce atoms to form CeCe2Mg10 cuboctahedra that share corners with six equivalent CeCe2Mg10 cuboctahedra, corners with twelve equivalent MgCe5Mg7 cuboctahedra, edges with eight equivalent MgCe5Mg7 cuboctahedra, edges with ten equivalent CeCe2Mg10 cuboctahedra, faces with four equivalent CeCe2Mg10 cuboctahedra, and faces with sixteen equivalent MgCe5Mg7 cuboctahedra. Both Ce–Ce bond lengths are 3.12 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is Magnesium-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to nine Mg and three equivalent Ce atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent CeCe5Mg7 cuboctahedra, corners with twelve MgCe3Mg9 cuboctahedra, edges with seven equivalent CeCe5Mg7 cuboctahedra, edges with eleven MgCe3Mg9 cuboctahedra, faces with seven equivalent CeCe5Mg7 cuboctahedra, and faces with thirteen MgCe3Mg9 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.11–3.24 Å. There are two shorter (3.44 Å) and one longer (3.50 Å) Mg–Ce bond lengths. In the second Mg site, Mg is bonded to eight Mg and four equivalent Ce atoms to form MgCe4Mg8 cuboctahedra that share corners with six equivalent CeCe5Mg7 cuboctahedra, corners with twelve MgCe3Mg9 cuboctahedra, edges with nine MgCe3Mg9 cuboctahedra, edges with nine equivalent CeCe5Mg7 cuboctahedra, faces with six equivalent CeCe5Mg7 cuboctahedra, and faces with fourteen MgCe3Mg9 cuboctahedra. There are two shorter (3.21 Å) and one longer (3.27 Å) Mg–Mg bond lengths. There are two shorter (3.42 Å) and two longer (3.47 Å) Mg–Ce bond lengths. Ce is bonded to seven Mg and five equivalent Ce atoms to form CeCe5Mg7 cuboctahedra that share corners with six equivalent CeCe5Mg7 cuboctahedra, corners with twelve MgCe3Mg9 cuboctahedra, edges with two equivalent CeCe5Mg7 cuboctahedra, edges with sixteen MgCe3Mg9 cuboctahedra, faces with seven equivalent CeCe5Mg7 cuboctahedra, and faces with thirteen MgCe3Mg9 cuboctahedra. There are a spread of Ce–Ce bond distances ranging from 3.03–3.24 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to seven equivalent Mg and five equivalent Ce atoms. There are a spread of Mg–Mg bond distances ranging from 3.09–3.55 Å. There are a spread of Mg–Ce bond distances ranging from 3.38–3.54 Å. Ce is bonded to ten equivalent Mg and two equivalent Ce atoms to form a mixture of edge and face-sharing CeCe2Mg10 cuboctahedra. Both Ce–Ce bond lengths are 2.98 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is Magnesium-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six Mg and six equivalent Ce atoms to form MgCe6Mg6 cuboctahedra that share corners with six equivalent CeCe4Mg8 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with seven equivalent CeCe4Mg8 cuboctahedra, edges with eleven MgCe6Mg6 cuboctahedra, faces with six equivalent CeCe4Mg8 cuboctahedra, and faces with fourteen MgCe6Mg6 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.09–3.21 Å. There are two shorter (3.34 Å) and four longer (3.43 Å) Mg–Ce bond lengths. In the second Mg site, Mg is bonded to ten Mg and two equivalent Ce atoms to form MgCe2Mg10 cuboctahedra that share corners with six equivalent CeCe4Mg8 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with seven MgCe6Mg6 cuboctahedra, edges with eleven equivalent CeCe4Mg8 cuboctahedra, faces with four equivalent CeCe4Mg8 cuboctahedra, and faces with sixteen MgCe6Mg6 cuboctahedra. There are two shorter (3.20 Å) and four longer (3.26 Å) Mg–Mg bond lengths. Both Mg–Ce bond lengths are 3.59 Å. Ce is bonded to eight Mg and four equivalent Ce atoms to form CeCe4Mg8 cuboctahedra that share corners with six equivalent CeCe4Mg8 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with eighteen MgCe6Mg6 cuboctahedra, faces with ten MgCe6Mg6 cuboctahedra, and faces with ten equivalent CeCe4Mg8 cuboctahedra. There are two shorter (2.95 Å) and two longer (3.20 Å) Ce–Ce bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is Magnesium-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to eight Mg and four equivalent Ce atoms to form MgCe4Mg8 cuboctahedra that share corners with six equivalent CeCe6Mg6 cuboctahedra, corners with twelve MgCe4Mg8 cuboctahedra, edges with three equivalent CeCe6Mg6 cuboctahedra, edges with fifteen MgCe4Mg8 cuboctahedra, faces with eight equivalent CeCe6Mg6 cuboctahedra, and faces with twelve MgCe4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.14–3.22 Å. There are two shorter (3.35 Å) and two longer (3.40 Å) Mg–Ce bond lengths. In the second Mg site, Mg is bonded to ten Mg and two equivalent Ce atoms to form MgCe2Mg10 cuboctahedra that share corners with six equivalent CeCe6Mg6 cuboctahedra, corners with twelve MgCe4Mg8 cuboctahedra, edges with seven equivalent MgCe4Mg8 cuboctahedra, edges with eleven equivalent CeCe6Mg6 cuboctahedra, faces with four equivalent CeCe6Mg6 cuboctahedra, and faces with sixteen MgCe4Mg8 cuboctahedra. There are two shorter (3.14 Å) and two longer (3.20 Å) Mg–Mg bond lengths. Both Mg–Ce bond lengths are 3.51 Å. Ce is bonded to six Mg and six equivalent Ce atoms to form CeCe6Mg6 cuboctahedra that share corners with six equivalent CeCe6Mg6 cuboctahedra, corners with twelve MgCe4Mg8 cuboctahedra, edges with four equivalent CeCe6Mg6 cuboctahedra, edges with fourteen MgCe4Mg8 cuboctahedra, faces with eight equivalent CeCe6Mg6 cuboctahedra, and faces with twelve MgCe4Mg8 cuboctahedra. There are four shorter (3.11 Å) and two longer (3.14 Å) Ce–Ce bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 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 to eight Mg and four equivalent Ce atoms to form MgCe4Mg8 cuboctahedra that share corners with eighteen equivalent MgCe4Mg8 cuboctahedra, edges with eight equivalent CeCe3Mg9 cuboctahedra, edges with ten MgCe4Mg8 cuboctahedra, faces with eight equivalent CeCe3Mg9 cuboctahedra, and faces with twelve MgCe4Mg8 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.30–3.41 Å. All Mg–Ce bond lengths are 3.39 Å. In the second Mg site, Mg is bonded to six equivalent Mg and six equivalent Ce atoms to form MgCe6Mg6 cuboctahedra that share corners with eighteen equivalent CeCe3Mg9 cuboctahedra, edges with eighteen MgCe4Mg8 cuboctahedra, faces with six equivalent CeCe3Mg9 cuboctahedra, and faces with fourteen MgCe4Mg8 cuboctahedra. All Mg–Ce bond lengths are 3.37 Å. Ce is bonded to nine Mg and three equivalent Ce atoms to form CeCe3Mg9 cuboctahedra that share corners with nine equivalent MgCe6Mg6 cuboctahedra, corners with nine equivalent CeCe3Mg9 cuboctahedra, edges with six equivalent CeCe3Mg9 cuboctahedra, edges with twelve equivalent MgCe4Mg8 cuboctahedra, faces with five equivalent CeCe3Mg9 cuboctahedra, and faces with fifteen MgCe4Mg8 cuboctahedra. All Ce–Ce bond lengths are 3.37 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded to nine Mg and three Ce atoms to form distorted MgCe3Mg9 cuboctahedra that share corners with eighteen MgCe3Mg9 cuboctahedra, edges with eight MgCe5Mg7 cuboctahedra, edges with ten CeCe4Mg8 cuboctahedra, faces with seven CeCe4Mg8 cuboctahedra, and faces with thirteen MgCe3Mg9 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.50 Å. There are one shorter (3.45 Å) and two longer (3.48 Å) Mg–Ce bond lengths. In the second Mg site, Mg is bonded to seven Mg and five Ce atoms to form MgCe5Mg7 cuboctahedra that share corners with eighteen MgCe3Mg9 cuboctahedra, edges with eight CeCe4Mg8 cuboctahedra, edges with ten MgCe3Mg9 cuboctahedra, faces with eight CeCe4Mg8 cuboctahedra, and faces with twelve MgCe3Mg9 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.28 Å. There are three shorter (3.38 Å) and two longer (3.42 Å) Mg–Ce bond lengths. In the third Mg site, Mg is bonded to eight Mg and four Ce atoms to form MgCe4Mg8 cuboctahedra that share corners with eighteen MgCe3Mg9 cuboctahedra, edges with six CeCe4Mg8 cuboctahedra, edges with twelve MgCe3Mg9 cuboctahedra, faces with nine CeCe4Mg8 cuboctahedra, and faces with eleven MgCe3Mg9 cuboctahedra. There are two shorter (3.18 Å) and two longer (3.24 Å) Mg–Mg bond lengths. There are a spread of Mg–Ce bond distances ranging from 3.37–3.48 Å. In the fourth Mg site, Mg is bonded to eight Mg and four Ce atoms to form distorted MgCe4Mg8 cuboctahedra that share corners with six equivalent MgCe4Mg8 cuboctahedra, corners with twelve CeCe4Mg8 cuboctahedra, edges with six CeCe4Mg8 cuboctahedra, edges with twelve MgCe3Mg9 cuboctahedra, faces with six CeCe4Mg8 cuboctahedra, and faces with fourteen MgCe3Mg9 cuboctahedra. Both Mg–Mg bond lengths are 3.18 Å. There are two shorter (3.43 Å) and two longer (3.46 Å) Mg–Ce bond lengths. There are two inequivalent Ce sites. In the first Ce site, Ce is bonded to eight Mg and four Ce atoms to form CeCe4Mg8 cuboctahedra that share corners with six equivalent MgCe4Mg8 cuboctahedra, corners with twelve CeCe4Mg8 cuboctahedra, edges with three equivalent CeCe4Mg8 cuboctahedra, edges with fifteen MgCe3Mg9 cuboctahedra, faces with five CeCe4Mg8 cuboctahedra, and faces with fifteen MgCe3Mg9 cuboctahedra. There are two shorter (2.82 Å) and two longer (3.18 Å) Ce–Ce bond lengths. In the second Ce site, Ce is bonded to eight Mg and four Ce atoms to form CeCe4Mg8 cuboctahedra that share corners with six equivalent MgCe4Mg8 cuboctahedra, corners with twelve CeCe4Mg8 cuboctahedra, edges with three equivalent CeCe4Mg8 cuboctahedra, edges with fifteen MgCe3Mg9 cuboctahedra, faces with five CeCe4Mg8 cuboctahedra, and faces with fifteen MgCe3Mg9 cuboctahedra. Both Ce–Ce bond lengths are 3.18 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeMg2 by Materials Project

CeMg2 is beta-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded to six Mg and six equivalent Ce atoms to form MgCe6Mg6 cuboctahedra that share corners with six equivalent CeCe2Mg10 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with seven equivalent CeCe2Mg10 cuboctahedra, edges with eleven equivalent MgCe4Mg8 cuboctahedra, faces with six equivalent CeCe2Mg10 cuboctahedra, and faces with fourteen MgCe6Mg6 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.41 Å. There are four shorter (3.34 Å) and two longer (3.36 Å) Mg–Ce bond lengths. In the second Mg site, Mg is bonded to eight Mg and four equivalent Ce atoms to form MgCe4Mg8 cuboctahedra that share corners with six equivalent CeCe2Mg10 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with three equivalent CeCe2Mg10 cuboctahedra, edges with fifteen MgCe6Mg6 cuboctahedra, faces with eight equivalent CeCe2Mg10 cuboctahedra, and faces with twelve MgCe6Mg6 cuboctahedra. There are two shorter (3.19 Å) and four longer (3.38 Å) Mg–Mg bond lengths. There are two shorter (3.38 Å) and two longer (3.42 Å) Mg–Ce bond lengths. Ce is bonded to ten Mg and two equivalent Ce atoms to form CeCe2Mg10 cuboctahedra that share corners with six equivalent CeCe2Mg10 cuboctahedra, corners with twelve MgCe6Mg6 cuboctahedra, edges with eight equivalent CeCe2Mg10 cuboctahedra, edges with ten MgCe6Mg6 cuboctahedra, faces with six equivalent CeCe2Mg10 cuboctahedra, and faces with fourteen MgCe6Mg6 cuboctahedra. Both Ce–Ce bond lengths are 3.19 Å.

36 MATERIALS SCIENCE↗