Materials Data on Cs2S by Materials Project
Cs2S is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 3-coordinate geometry to three equivalent S2- atoms. There are one shorter (3.51 Å) and two longer (3.68 Å) Cs–S bond lengths. In the second Cs1+ site, Cs1+ is bonded to four equivalent S2- atoms to form a mixture of edge and corner-sharing CsS4 tetrahedra. There are a spread of Cs–S bond distances ranging from 3.47–3.56 Å. S2- is bonded in a 9-coordinate geometry to seven Cs1+ atoms.
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