Materials Data on CaSn3S7 by Materials Project

CaSn3S7 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Ca–S bond distances ranging from 2.74–3.27 Å. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Sn–S bond distances ranging from 2.32–2.67 Å. In the second Sn4+ site, Sn4+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Sn–S bond distances ranging from 2.32–2.62 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded to one Ca2+ and three Sn4+ atoms to form a mixture of distorted edge and corner-sharing SCaSn3 tetrahedra. In the second S2- site, S2- is bonded in a bent 120 degrees geometry to one Ca2+ and one Sn4+ atom. In the third S2- site, S2- is bonded in a bent 120 degrees geometry to one Ca2+ and one Sn4+ atom. In the fourth S2- site, S2- is bonded in a 4-coordinate geometry to one Ca2+ and three Sn4+ atoms.