Materials Data on Sr2La2MgTi3O12 by Materials Project

Abstract

Sr2MgLa2Ti3O12 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sr2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Sr–O bond distances ranging from 2.52–3.10 Å. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with two equivalent TiO6 octahedra and corners with four equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 23–26°. There are four shorter (2.02 Å) and two longer (2.13 Å) Mg–O bond lengths. La3+ is bonded in a 9-coordinate geometry to seven O2- atoms. There are a spread of La–O bond distances ranging from 2.37–2.89 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedra tilt angles range from 12–19°. All Ti–O bond lengths are 1.99 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share a cornercorner with one MgO6 octahedra and corners with five TiO6 octahedra. The corner-sharing octahedra tilt angles range from 17–26°. There are a spread of Ti–O bond distances ranging from 1.90–2.13 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to four equivalent Sr2+ and two Ti4+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Mg2+, two equivalent La3+, and one Ti4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Sr2+ and two equivalent Ti4+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Sr2+, two equivalent La3+, and two equivalent Ti4+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Sr2+ and two equivalent Ti4+ atoms. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Mg2+ and three equivalent La3+ atoms.