DOI: 10.17188/1738655
title: Materials Data on Mg149Ag by Materials Project

description: Mg149Ag 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 Ag atom to form distorted MgMg11Ag cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, a faceface with one AgMg12 cuboctahedra, and faces with nineteen MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.09–3.23 Å. The Mg–Ag bond length is 3.12 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, an edgeedge with one AgMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are four shorter (3.17 Å) and six longer (3.19 Å) Mg–Mg bond lengths. In the third Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, an edgeedge with one AgMg12 cuboctahedra, edges with seventeen MgMg12 cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.20 Å. In the fifth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one AgMg12 cuboctahedra, corners with seventeen MgMg11Ag cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are seven shorter (3.18 Å) and one longer (3.20 Å) Mg–Mg bond lengths. In the sixth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the seventh Mg site, Mg is bonded to eleven Mg and one Ag atom to form distorted MgMg11Ag cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, a faceface with one AgMg12 cuboctahedra, and faces with nineteen MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.12–3.22 Å. The Mg–Ag bond length is 3.12 Å. In the eighth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, an edgeedge with one AgMg12 cuboctahedra, edges with seventeen MgMg11Ag cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.19 Å. 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 MgMg11Ag cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are six shorter (3.18 Å) and one longer (3.19 Å) Mg–Mg bond lengths. In the tenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.19 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 MgMg11Ag cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are one shorter (3.18 Å) and four longer (3.19 Å) Mg–Mg bond lengths. In the twelfth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the thirteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg11Ag cuboctahedra, a faceface with one AgMg12 cuboctahedra, and faces with nineteen MgMg11Ag cuboctahedra. All Mg–Mg bond lengths are 3.17 Å. In the fourteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, a faceface with one AgMg12 cuboctahedra, and faces with nineteen MgMg12 cuboctahedra. There are six shorter (3.17 Å) and three longer (3.20 Å) Mg–Mg bond lengths. In the fifteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share a cornercorner with one AgMg12 cuboctahedra, corners with seventeen MgMg11Ag cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.19 Å. In the sixteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are five shorter (3.18 Å) and three longer (3.19 Å) Mg–Mg bond lengths. In the seventeenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the eighteenth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the nineteenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg11Ag cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the twentieth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the twenty-first Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the twenty-second Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. There are two shorter (3.17 Å) and two longer (3.18 Å) Mg–Mg bond lengths. In the twenty-third Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. There are one shorter (3.17 Å) and four longer (3.18 Å) Mg–Mg bond lengths. In the twenty-fourth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. All Mg–Mg bond lengths are 3.18 Å. In the twenty-fifth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. In the twenty-sixth Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.18 Å. In the twenty-seventh Mg site, Mg is bonded to twelve Mg atoms to form a mixture of edge, face, and corner-sharing MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.18 Å. Ag is bonded to twelve Mg atoms to form AgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg11Ag cuboctahedra.