Materials Data on Cs7(FeS2)4 by Materials Project
Cs7(FeS2)4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are four inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Cs–S bond distances ranging from 3.54–3.85 Å. In the second Cs1+ site, Cs1+ is bonded in a 2-coordinate geometry to six S2- atoms. There are a spread of Cs–S bond distances ranging from 3.49–4.11 Å. In the third Cs1+ site, Cs1+ is bonded in a 2-coordinate geometry to seven S2- atoms. There are a spread of Cs–S bond distances ranging from 3.50–3.95 Å. In the fourth Cs1+ site, Cs1+ is bonded to four S2- atoms to form distorted CsS4 tetrahedra that share corners with two equivalent CsS4 tetrahedra, corners with four FeS4 tetrahedra, and an edgeedge with one CsS4 tetrahedra. There are a spread of Cs–S bond distances ranging from 3.48–3.57 Å. There are two inequivalent Fe+2.25+ sites. In the first Fe+2.25+ site, Fe+2.25+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with two equivalent CsS4 tetrahedra and edges with three FeS4 tetrahedra. There are a spread of Fe–S bond distances ranging from 2.25–2.40 Å. In the second Fe+2.25+ site, Fe+2.25+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with two equivalent CsS4 tetrahedra and edges with three FeS4 tetrahedra. There are a spread of Fe–S bond distances ranging from 2.24–2.41 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to four Cs1+ and three Fe+2.25+ atoms. In the second S2- site, S2- is bonded in a 7-coordinate geometry to four Cs1+ and three Fe+2.25+ atoms. In the third S2- site, S2- is bonded in a 1-coordinate geometry to six Cs1+ and one Fe+2.25+ atom. In the fourth S2- site, S2- is bonded in a 1-coordinate geometry to seven Cs1+ and one Fe+2.25+ atom.