Materials Data on CeMg by Materials Project

Abstract

CeMg crystallizes in the hexagonal P-6m2 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 CeCe12 cuboctahedra, corners with twelve equivalent MgCe3Mg9 cuboctahedra, edges with six equivalent CeCe9Mg3 cuboctahedra, edges with twelve MgCe3Mg9 cuboctahedra, faces with seven CeCe12 cuboctahedra, and faces with thirteen MgCe3Mg9 cuboctahedra. There are six shorter (3.16 Å) and three longer (3.22 Å) Mg–Mg bond lengths. All Mg–Ce bond lengths are 3.44 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with six equivalent MgMg12 cuboctahedra, corners with twelve equivalent CeCe9Mg3 cuboctahedra, edges with eighteen MgCe3Mg9 cuboctahedra, faces with two equivalent CeCe9Mg3 cuboctahedra, and faces with eighteen MgCe3Mg9 cuboctahedra. All Mg–Mg bond lengths are 3.16 Å. There are two 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 MgCe3Mg9 cuboctahedra, edges with eighteen CeCe12 cuboctahedra, faces with two equivalent MgCe3Mg9 cuboctahedra, and faces with eighteen CeCe12 cuboctahedra. There are six shorter (3.16 Å) and six longer (3.50 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 six equivalent MgMg12 cuboctahedra, corners with twelve equivalent CeCe9Mg3 cuboctahedra, edges with six equivalent MgCe3Mg9 cuboctahedra, edges with twelve CeCe12 cuboctahedra, faces with seven MgCe3Mg9 cuboctahedra, and faces with thirteen CeCe12 cuboctahedra. All Ce–Ce bond lengths are 3.16 Å.