Materials Data on CsFeS2 by Materials Project
CsFeS2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Cs1+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Cs–S bond distances ranging from 3.51–3.87 Å. Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. There are two shorter (2.18 Å) and two longer (2.19 Å) Fe–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to four equivalent Cs1+ and two equivalent Fe3+ atoms. In the second S2- site, S2- is bonded to four equivalent Cs1+ and two equivalent Fe3+ atoms to form a mixture of distorted corner and edge-sharing SCs4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 12–79°.