Materials Data on Sr(LaS2)2 by Materials Project

Abstract

Sr(LaS2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Sr2+ is bonded to eight equivalent S2- atoms to form distorted SrS8 hexagonal bipyramids that share corners with eight equivalent LaS8 hexagonal bipyramids, edges with four equivalent SrS8 hexagonal bipyramids, and faces with eight equivalent LaS8 hexagonal bipyramids. There are four shorter (3.00 Å) and four longer (3.17 Å) Sr–S bond lengths. La3+ is bonded to eight equivalent S2- atoms to form distorted LaS8 hexagonal bipyramids that share corners with four equivalent SrS8 hexagonal bipyramids, corners with four equivalent LaS8 hexagonal bipyramids, edges with four equivalent LaS8 hexagonal bipyramids, faces with four equivalent SrS8 hexagonal bipyramids, and faces with four equivalent LaS8 hexagonal bipyramids. There are a spread of La–S bond distances ranging from 2.92–3.14 Å. S2- is bonded to two equivalent Sr2+ and four equivalent La3+ atoms to form a mixture of distorted face, edge, and corner-sharing SSr2La4 octahedra. The corner-sharing octahedra tilt angles range from 15–51°.