Materials Data on Sr2La2MgRuO8 by Materials Project

Abstract

Sr2MgLa2RuO8 is (La,Ba)CuO4-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.34–2.77 Å. Mg2+ is bonded to six O2- atoms to form corner-sharing MgO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (1.95 Å) and two longer (2.18 Å) Mg–O bond lengths. La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.50–2.79 Å. Ru4+ is bonded to six O2- atoms to form corner-sharing RuO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (1.95 Å) and two longer (2.13 Å) Ru–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Sr2+, one La3+, and one Ru4+ atom to form distorted OSr4LaRu octahedra that share corners with seventeen OSr4Ru2 octahedra, edges with eight OSr4LaRu octahedra, and faces with four equivalent OSr4Ru2 octahedra. The corner-sharing octahedra tilt angles range from 0–55°. In the second O2- site, O2- is bonded to one Sr2+, one Mg2+, and four equivalent La3+ atoms to form distorted OSrLa4Mg octahedra that share corners with seventeen OSr4Ru2 octahedra, edges with eight OSr4LaRu octahedra, and faces with four equivalent OLa4Mg2 octahedra. The corner-sharing octahedra tilt angles range from 0–51°. In the third O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Ru4+ atoms to form a mixture of distorted edge, face, and corner-sharing OSr4Ru2 octahedra. The corner-sharing octahedra tilt angles range from 0–55°. In the fourth O2- site, O2- is bonded to two equivalent Mg2+ and four equivalent La3+ atoms to form a mixture of distorted edge, face, and corner-sharing OLa4Mg2 octahedra. The corner-sharing octahedra tilt angles range from 0–51°.