Materials Data on Li3FeS3 by Materials Project
Li3FeS3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 3-coordinate geometry to five S2- atoms. There are a spread of Li–S bond distances ranging from 2.36–3.05 Å. In the second Li1+ site, Li1+ is bonded to six S2- atoms to form distorted LiS6 octahedra that share corners with four equivalent FeS4 tetrahedra, edges with three equivalent LiS6 octahedra, and edges with two equivalent FeS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.53–3.03 Å. In the third Li1+ site, Li1+ is bonded in a 4-coordinate geometry to four equivalent S2- atoms. There are two shorter (2.46 Å) and two longer (2.74 Å) Li–S bond lengths. Fe3+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with four equivalent LiS6 octahedra, edges with two equivalent LiS6 octahedra, and an edgeedge with one FeS4 tetrahedra. The corner-sharing octahedra tilt angles range from 15–51°. There are a spread of Fe–S bond distances ranging from 2.20–2.27 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to three Li1+ and two equivalent Fe3+ atoms to form edge-sharing SLi3Fe2 trigonal bipyramids. In the second S2- site, S2- is bonded in a 7-coordinate geometry to six Li1+ and one Fe3+ atom.