DOI: 10.17188/1728857
title: Materials Data on Mg149Sb by Materials Project

description: Mg149Sb is alpha Samarium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are twenty-seven inequivalent Mg sites. In the first Mg site, Mg is bonded to eleven Mg and one Sb atom to form distorted MgMg11Sb cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, a faceface with one SbMg12 cuboctahedra, and faces with nineteen MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.26 Å. The Mg–Sb bond length is 3.23 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, an edgeedge with one SbMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.19–3.21 Å. In the third Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are eight shorter (3.19 Å) and two longer (3.20 Å) Mg–Mg bond lengths. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, an edgeedge with one SbMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.21 Å. In the fifth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one SbMg12 cuboctahedra, corners with seventeen MgMg11Sb cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.19 Å. In the sixth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.19 Å. In the seventh Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, an edgeedge with one SbMg12 cuboctahedra, edges with seventeen MgMg11Sb cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are three shorter (3.19 Å) and six longer (3.20 Å) Mg–Mg bond lengths. In the eighth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are five shorter (3.19 Å) and three longer (3.20 Å) Mg–Mg bond lengths. In the ninth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are three shorter (3.19 Å) and four longer (3.20 Å) Mg–Mg bond lengths. In the tenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.19 Å. In the eleventh Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.19 Å. In the twelfth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, a faceface with one SbMg12 cuboctahedra, and faces with nineteen MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.21 Å. In the thirteenth Mg site, Mg is bonded to eleven Mg and one Sb atom to form distorted MgMg11Sb cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Sb cuboctahedra, a faceface with one SbMg12 cuboctahedra, and faces with nineteen MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.21 Å. The Mg–Sb bond length is 3.22 Å. In the fourteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the fifteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one SbMg12 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are three shorter (3.19 Å) and six longer (3.20 Å) Mg–Mg bond lengths. In the sixteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the seventeenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are three shorter (3.19 Å) and four longer (3.20 Å) Mg–Mg bond lengths. In the eighteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Sb cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are two shorter (3.19 Å) and four longer (3.20 Å) Mg–Mg bond lengths. In the nineteenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are two shorter (3.19 Å) and three longer (3.20 Å) Mg–Mg bond lengths. In the twentieth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one SbMg12 cuboctahedra, corners with seventeen MgMg11Sb cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.20 Å. In the twenty-first Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are two shorter (3.19 Å) and four longer (3.20 Å) Mg–Mg bond lengths. In the twenty-second Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. There are two shorter (3.19 Å) and four longer (3.20 Å) Mg–Mg bond lengths. In the twenty-third Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.20 Å. In the twenty-fourth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the twenty-fifth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. In the twenty-sixth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.20 Å. In the twenty-seventh Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, corner, and face-sharing MgMg12 cuboctahedra. Sb is bonded to twelve Mg atoms to form SbMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg11Sb cuboctahedra.