Materials Data on Mg5Ga by Materials Project

Abstract

Mg5Ga crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are five inequivalent Mg sites. In the first Mg site, Mg is bonded to ten Mg and two equivalent Ga atoms to form distorted MgMg10Ga2 cuboctahedra that share corners with eighteen MgMg10Ga2 cuboctahedra, edges with four equivalent GaMg12 cuboctahedra, edges with fourteen MgMg10Ga2 cuboctahedra, faces with four equivalent GaMg12 cuboctahedra, and faces with sixteen MgMg9Ga3 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.08–3.17 Å. Both Mg–Ga bond lengths are 3.15 Å. In the second Mg site, Mg is bonded to nine Mg and three equivalent Ga atoms to form distorted MgMg9Ga3 cuboctahedra that share corners with six equivalent GaMg12 cuboctahedra, corners with twelve equivalent MgMg9Ga3 cuboctahedra, edges with eighteen MgMg10Ga2 cuboctahedra, faces with four equivalent GaMg12 cuboctahedra, and faces with sixteen MgMg10Ga2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.09–3.17 Å. All Mg–Ga bond lengths are 3.09 Å. In the third Mg site, Mg is bonded to ten Mg and two equivalent Ga atoms to form distorted MgMg10Ga2 cuboctahedra that share corners with eighteen MgMg10Ga2 cuboctahedra, edges with four equivalent GaMg12 cuboctahedra, edges with fourteen MgMg9Ga3 cuboctahedra, faces with four equivalent GaMg12 cuboctahedra, and faces with sixteen MgMg10Ga2 cuboctahedra. There are two shorter (3.08 Å) and one longer (3.12 Å) Mg–Mg bond lengths. Both Mg–Ga bond lengths are 3.15 Å. In the fourth Mg site, Mg is bonded to ten Mg and two equivalent Ga atoms to form distorted MgMg10Ga2 cuboctahedra that share corners with eighteen MgMg10Ga2 cuboctahedra, edges with four equivalent GaMg12 cuboctahedra, edges with fourteen MgMg9Ga3 cuboctahedra, faces with four equivalent GaMg12 cuboctahedra, and faces with sixteen MgMg10Ga2 cuboctahedra. There are four shorter (3.08 Å) and two longer (3.12 Å) Mg–Mg bond lengths. Both Mg–Ga bond lengths are 3.15 Å. In the fifth Mg site, Mg is bonded to ten Mg and two equivalent Ga atoms to form distorted MgMg10Ga2 cuboctahedra that share corners with eighteen MgMg10Ga2 cuboctahedra, edges with four equivalent GaMg12 cuboctahedra, edges with fourteen MgMg9Ga3 cuboctahedra, faces with four equivalent GaMg12 cuboctahedra, and faces with sixteen MgMg10Ga2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.08–3.17 Å. Both Mg–Ga bond lengths are 3.15 Å. Ga is bonded to twelve Mg atoms to form GaMg12 cuboctahedra that share corners with six equivalent GaMg12 cuboctahedra, corners with twelve equivalent MgMg9Ga3 cuboctahedra, edges with six equivalent GaMg12 cuboctahedra, edges with twelve MgMg10Ga2 cuboctahedra, and faces with twenty MgMg10Ga2 cuboctahedra.