Materials Data on Mg2Al4Zn3 by Materials Project

Abstract

Mg2Zn3Al4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to three equivalent Mg and twelve Al atoms. There are two shorter (3.36 Å) and one longer (3.39 Å) Mg–Mg bond lengths. There are a spread of Mg–Al bond distances ranging from 3.07–3.24 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to three equivalent Mg, nine Zn, and three equivalent Al atoms. There are two shorter (3.38 Å) and one longer (3.42 Å) Mg–Mg bond lengths. There are a spread of Mg–Zn bond distances ranging from 3.06–3.26 Å. There are two shorter (3.17 Å) and one longer (3.19 Å) Mg–Al bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded in a 9-coordinate geometry to three equivalent Mg, four Zn, and two Al atoms. There are a spread of Zn–Zn bond distances ranging from 2.63–2.73 Å. There are one shorter (2.63 Å) and one longer (2.69 Å) Zn–Al bond lengths. In the second Zn site, Zn is bonded in a 9-coordinate geometry to three equivalent Mg, four equivalent Zn, and two Al atoms. There are one shorter (2.63 Å) and one longer (2.70 Å) Zn–Al bond lengths. There are four inequivalent Al sites. In the first Al site, Al is bonded to six equivalent Mg and six Zn atoms to form edge-sharing AlMg6Zn6 cuboctahedra. In the second Al site, Al is bonded to six equivalent Mg and six Al atoms to form edge-sharing AlMg6Al6 cuboctahedra. There are four shorter (2.68 Å) and two longer (2.69 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 9-coordinate geometry to three equivalent Mg, one Zn, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.65–2.71 Å. In the fourth Al site, Al is bonded in a 9-coordinate geometry to three equivalent Mg, one Zn, and five Al atoms.