Materials Data on SrLaMg6 by Materials Project

Abstract

SrMg6La crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Sr is bonded to ten Mg and two equivalent La atoms to form SrLa2Mg10 cuboctahedra that share corners with four equivalent MgSr2Mg10 cuboctahedra, corners with six equivalent SrLa2Mg10 cuboctahedra, edges with two equivalent MgSr2Mg10 cuboctahedra, edges with four equivalent LaSr2Mg10 cuboctahedra, faces with two equivalent SrLa2Mg10 cuboctahedra, faces with two equivalent LaSr2Mg10 cuboctahedra, and faces with eight MgLa2Mg10 cuboctahedra. There are a spread of Sr–Mg bond distances ranging from 3.33–3.59 Å. Both Sr–La bond lengths are 3.57 Å. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a 3-coordinate geometry to two equivalent Sr, seven Mg, and two equivalent La atoms. There are a spread of Mg–Mg bond distances ranging from 3.36–3.52 Å. There are one shorter (3.27 Å) and one longer (3.58 Å) Mg–La bond lengths. In the second Mg site, Mg is bonded to ten Mg and two equivalent La atoms to form MgLa2Mg10 cuboctahedra that share corners with four equivalent LaSr2Mg10 cuboctahedra, corners with six equivalent MgLa2Mg10 cuboctahedra, edges with two equivalent LaSr2Mg10 cuboctahedra, edges with four equivalent MgSr2Mg10 cuboctahedra, faces with two equivalent LaSr2Mg10 cuboctahedra, faces with four MgLa2Mg10 cuboctahedra, and faces with six equivalent SrLa2Mg10 cuboctahedra. There are four shorter (3.38 Å) and two longer (3.45 Å) Mg–Mg bond lengths. Both Mg–La bond lengths are 3.59 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to two equivalent Sr, six Mg, and two equivalent La atoms. There are one shorter (3.38 Å) and one longer (3.47 Å) Mg–Mg bond lengths. Both Mg–La bond lengths are 3.34 Å. In the fourth Mg site, Mg is bonded to two equivalent Sr and ten Mg atoms to form MgSr2Mg10 cuboctahedra that share corners with four equivalent SrLa2Mg10 cuboctahedra, corners with six equivalent MgSr2Mg10 cuboctahedra, edges with two equivalent SrLa2Mg10 cuboctahedra, edges with four equivalent MgLa2Mg10 cuboctahedra, faces with two equivalent SrLa2Mg10 cuboctahedra, faces with four MgLa2Mg10 cuboctahedra, and faces with six equivalent LaSr2Mg10 cuboctahedra. La is bonded to two equivalent Sr and ten Mg atoms to form LaSr2Mg10 cuboctahedra that share corners with four equivalent MgLa2Mg10 cuboctahedra, corners with six equivalent LaSr2Mg10 cuboctahedra, edges with two equivalent MgLa2Mg10 cuboctahedra, edges with four equivalent SrLa2Mg10 cuboctahedra, faces with two equivalent SrLa2Mg10 cuboctahedra, faces with two equivalent LaSr2Mg10 cuboctahedra, and faces with eight MgLa2Mg10 cuboctahedra.