Materials Data on Ba7Sn3S13 by Materials Project
Ba7Sn3S13 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine S2- atoms. There are a spread of Ba–S bond distances ranging from 3.26–3.55 Å. In the second Ba2+ site, Ba2+ is bonded to six S2- atoms to form distorted BaS6 pentagonal pyramids that share a cornercorner with one SnS4 tetrahedra, edges with two SnS4 tetrahedra, and a faceface with one BaS6 pentagonal pyramid. There are a spread of Ba–S bond distances ranging from 3.09–3.47 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Ba–S bond distances ranging from 3.18–3.71 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Ba–S bond distances ranging from 3.23–3.71 Å. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to four S2- atoms to form SnS4 tetrahedra that share a cornercorner with one BaS6 pentagonal pyramid and an edgeedge with one BaS6 pentagonal pyramid. There are a spread of Sn–S bond distances ranging from 2.41–2.43 Å. In the second Sn4+ site, Sn4+ is bonded to four S2- atoms to form SnS4 tetrahedra that share edges with two equivalent BaS6 pentagonal pyramids. There are a spread of Sn–S bond distances ranging from 2.37–2.44 Å. There are eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 1-coordinate geometry to four Ba2+ and one Sn4+ atom. In the second S2- site, S2- is bonded in a 6-coordinate geometry to five Ba2+ and one Sn4+ atom. In the third S2- site, S2- is bonded in a 4-coordinate geometry to three Ba2+ and one Sn4+ atom. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to four Ba2+ and one Sn4+ atom. In the fifth S2- site, S2- is bonded in a 6-coordinate geometry to five Ba2+ and one Sn4+ atom. In the sixth S2- site, S2- is bonded in a 5-coordinate geometry to four Ba2+ and one Sn4+ atom. In the seventh S2- site, S2- is bonded in a 5-coordinate geometry to four Ba2+ and one Sn4+ atom. In the eighth S2- site, S2- is bonded in a 6-coordinate geometry to six Ba2+ atoms.