Materials Data on Sr2SnS3F2 by Materials Project
Sr2SnS3F2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to one S2- and four equivalent F1- atoms. The Sr–S bond length is 3.37 Å. There are three shorter (2.55 Å) and one longer (2.56 Å) Sr–F bond lengths. Sn4+ is bonded to four S2- atoms to form corner-sharing SnS4 tetrahedra. There are a spread of Sn–S bond distances ranging from 2.37–2.49 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 1-coordinate geometry to one Sn4+ atom. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr2+ and two equivalent Sn4+ atoms. F1- is bonded to four equivalent Sr2+ atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra.