Materials Data on Sr3LaTaAl3O12 by Materials Project

Abstract

Sr3LaTaAl3O12 is (Cubic) Perovskite-derived structured and crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are two inequivalent Sr sites. In the first Sr site, Sr is bonded to twelve O atoms to form SrO12 cuboctahedra that share corners with four equivalent LaO12 cuboctahedra, corners with eight SrO12 cuboctahedra, faces with two equivalent LaO12 cuboctahedra, faces with four SrO12 cuboctahedra, faces with two equivalent TaO6 octahedra, and faces with six AlO6 octahedra. There are a spread of Sr–O bond distances ranging from 2.68–2.84 Å. In the second Sr site, Sr is bonded to twelve O atoms to form SrO12 cuboctahedra that share corners with four equivalent LaO12 cuboctahedra, corners with eight equivalent SrO12 cuboctahedra, faces with six SrO12 cuboctahedra, faces with two equivalent TaO6 octahedra, and faces with six AlO6 octahedra. There are a spread of Sr–O bond distances ranging from 2.69–2.82 Å. La is bonded to twelve O atoms to form LaO12 cuboctahedra that share corners with twelve SrO12 cuboctahedra, faces with two equivalent LaO12 cuboctahedra, faces with four equivalent SrO12 cuboctahedra, faces with two equivalent TaO6 octahedra, and faces with six AlO6 octahedra. There are a spread of La–O bond distances ranging from 2.63–2.80 Å. Ta is bonded to six O atoms to form TaO6 octahedra that share corners with six AlO6 octahedra, faces with two equivalent LaO12 cuboctahedra, and faces with six SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–4°. There is two shorter (1.96 Å) and four longer (1.99 Å) Ta–O bond length. There are three inequivalent Al sites. In the first Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with two equivalent AlO6 octahedra, corners with four equivalent TaO6 octahedra, faces with two equivalent LaO12 cuboctahedra, and faces with six SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–4°. There is four shorter (1.90 Å) and two longer (1.95 Å) Al–O bond length. In the second Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with two equivalent TaO6 octahedra, corners with four equivalent AlO6 octahedra, faces with two equivalent LaO12 cuboctahedra, and faces with six SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–5°. There is four shorter (1.91 Å) and two longer (1.95 Å) Al–O bond length. In the third Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with six AlO6 octahedra, faces with two equivalent LaO12 cuboctahedra, and faces with six SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–5°. There are a spread of Al–O bond distances ranging from 1.92–1.97 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted linear geometry to two equivalent Sr, two equivalent La, one Ta, and one Al atom. In the second O site, O is bonded to two equivalent Sr, two equivalent La, and two Al atoms to form distorted OSr2La2Al2 octahedra that share corners with two equivalent OSr4Al2 octahedra, edges with two equivalent OSr2La2Al2 octahedra, and faces with four OSr2La2Al2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the third O site, O is bonded in a distorted linear geometry to four Sr, one Ta, and one Al atom. In the fourth O site, O is bonded to four Sr and two Al atoms to form distorted OSr4Al2 octahedra that share corners with two equivalent OSr2La2Al2 octahedra, edges with two equivalent OSr4Al2 octahedra, and faces with four OSr2La2Al2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the fifth O site, O is bonded in a distorted linear geometry to three Sr, one La, one Ta, and one Al atom. In the sixth O site, O is bonded in a distorted linear geometry to three Sr, one La, and two Al atoms.