DOI: 10.17188/1672080
title: Materials Data on CaMg14Nb by Materials Project

description: CaMg14Nb crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ca is bonded to twelve Mg atoms to form CaMg12 cuboctahedra that share corners with six equivalent CaMg12 cuboctahedra, corners with twelve equivalent MgMg10Nb2 cuboctahedra, edges with eighteen MgCa2Mg10 cuboctahedra, faces with two equivalent NbMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are six shorter (3.24 Å) and six longer (3.25 Å) Ca–Mg bond lengths. There are five inequivalent Mg sites. In the first Mg site, Mg is bonded to two equivalent Ca and ten Mg atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with four equivalent NbMg12 cuboctahedra, corners with fourteen MgCa2Mg10 cuboctahedra, edges with two equivalent CaMg12 cuboctahedra, edges with sixteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgMg10Nb2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.15–3.30 Å. In the second Mg site, Mg is bonded to ten Mg and two equivalent Nb atoms to form MgMg10Nb2 cuboctahedra that share corners with four equivalent CaMg12 cuboctahedra, corners with fourteen MgMg10Nb2 cuboctahedra, edges with two equivalent NbMg12 cuboctahedra, edges with sixteen MgMg10Nb2 cuboctahedra, faces with two equivalent NbMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.06–3.24 Å. Both Mg–Nb bond lengths are 3.24 Å. In the third Mg site, Mg is bonded to two equivalent Ca and ten Mg atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with four equivalent NbMg12 cuboctahedra, corners with fourteen MgMg10Nb2 cuboctahedra, edges with two equivalent CaMg12 cuboctahedra, edges with sixteen MgCa2Mg10 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.15–3.30 Å. In the fourth Mg site, Mg is bonded to one Ca, ten Mg, and one Nb atom to form distorted MgCaMg10Nb cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with two equivalent CaMg12 cuboctahedra, edges with two equivalent NbMg12 cuboctahedra, edges with fourteen MgCa2Mg10 cuboctahedra, a faceface with one CaMg12 cuboctahedra, a faceface with one NbMg12 cuboctahedra, and faces with eighteen MgCa2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.20–3.28 Å. The Mg–Nb bond length is 3.04 Å. In the fifth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with eighteen MgCa2Mg10 cuboctahedra, faces with three equivalent CaMg12 cuboctahedra, faces with three equivalent NbMg12 cuboctahedra, and faces with fourteen MgCa2Mg10 cuboctahedra. Nb is bonded to twelve Mg atoms to form NbMg12 cuboctahedra that share corners with six equivalent NbMg12 cuboctahedra, corners with twelve MgCa2Mg10 cuboctahedra, edges with eighteen MgMg10Nb2 cuboctahedra, faces with two equivalent CaMg12 cuboctahedra, and faces with eighteen MgMg10Nb2 cuboctahedra.