DOI: 10.17188/1651884
title: Materials Data on CaMg14Al by Materials Project

description: CaMg14Al crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Ca is bonded to ten Mg and two equivalent Al atoms to form CaMg10Al2 cuboctahedra that share corners with six equivalent CaMg10Al2 cuboctahedra, corners with twelve MgMg12 cuboctahedra, edges with two equivalent AlCa2Mg10 cuboctahedra, edges with sixteen MgCaMg10Al cuboctahedra, faces with two equivalent AlCa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Ca–Mg bond distances ranging from 3.21–3.29 Å. Both Ca–Al bond lengths are 3.19 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent CaMg10Al2 cuboctahedra, corners with fourteen MgMg12 cuboctahedra, edges with eighteen MgCaMg10Al cuboctahedra, faces with two equivalent AlCa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.16–3.25 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent AlCa2Mg10 cuboctahedra, corners with fourteen MgMg12 cuboctahedra, edges with eighteen MgCaMg10Al cuboctahedra, faces with two equivalent CaMg10Al2 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.16–3.23 Å. In the third Mg site, Mg is bonded to two equivalent Ca, eight Mg, and two equivalent Al atoms to form distorted MgCa2Mg8Al2 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with two equivalent CaMg10Al2 cuboctahedra, edges with two equivalent AlCa2Mg10 cuboctahedra, edges with fourteen MgCa2Mg8Al2 cuboctahedra, faces with two equivalent CaMg10Al2 cuboctahedra, faces with two equivalent AlCa2Mg10 cuboctahedra, and faces with sixteen MgCa2Mg8Al2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.12–3.26 Å. There are one shorter (3.11 Å) and one longer (3.33 Å) Mg–Al bond lengths. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent CaMg10Al2 cuboctahedra, corners with four equivalent AlCa2Mg10 cuboctahedra, corners with ten MgCa2Mg8Al2 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.13–3.25 Å. In the fifth Mg site, Mg is bonded to one Ca, ten Mg, and one Al atom to form MgCaMg10Al cuboctahedra that share corners with eighteen MgCaMg10Al cuboctahedra, edges with two equivalent CaMg10Al2 cuboctahedra, edges with two equivalent AlCa2Mg10 cuboctahedra, edges with fourteen MgMg12 cuboctahedra, a faceface with one CaMg10Al2 cuboctahedra, a faceface with one AlCa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.12–3.26 Å. The Mg–Al bond length is 3.20 Å. In the sixth Mg site, Mg is bonded to eleven Mg and one Al atom to form distorted MgMg11Al cuboctahedra that share corners with eighteen MgCaMg10Al cuboctahedra, edges with two equivalent AlCa2Mg10 cuboctahedra, edges with sixteen MgMg12 cuboctahedra, a faceface with one AlCa2Mg10 cuboctahedra, faces with three equivalent CaMg10Al2 cuboctahedra, and faces with sixteen MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.19 Å. The Mg–Al bond length is 3.19 Å. In the seventh Mg site, Mg is bonded to one Ca and eleven Mg atoms to form MgCaMg11 cuboctahedra that share corners with eighteen MgCaMg10Al cuboctahedra, edges with two equivalent CaMg10Al2 cuboctahedra, edges with sixteen MgMg12 cuboctahedra, a faceface with one CaMg10Al2 cuboctahedra, faces with three equivalent AlCa2Mg10 cuboctahedra, and faces with sixteen MgMg12 cuboctahedra. Al is bonded to two equivalent Ca and ten Mg atoms to form distorted AlCa2Mg10 cuboctahedra that share corners with six equivalent AlCa2Mg10 cuboctahedra, corners with twelve MgMg12 cuboctahedra, edges with two equivalent CaMg10Al2 cuboctahedra, edges with sixteen MgCaMg10Al cuboctahedra, faces with two equivalent CaMg10Al2 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra.