Materials Data on KRb(Fe2S3)2 by Materials Project
RbK(Fe2S3)2 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Rb1+ is bonded in a 10-coordinate geometry to ten S2- atoms. There are a spread of Rb–S bond distances ranging from 3.37–3.71 Å. K1+ is bonded in a 10-coordinate geometry to ten S2- atoms. There are a spread of K–S bond distances ranging from 3.36–3.73 Å. Fe+2.50+ is bonded to four S2- atoms to form a mixture of edge and corner-sharing FeS4 tetrahedra. There are two shorter (2.13 Å) and two longer (2.19 Å) Fe–S bond lengths. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Rb1+, two equivalent K1+, and two equivalent Fe+2.50+ atoms. In the second S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Rb1+, two equivalent K1+, and two equivalent Fe+2.50+ atoms. In the third S2- site, S2- is bonded in a 6-coordinate geometry to two equivalent K1+ and four equivalent Fe+2.50+ atoms. In the fourth S2- site, S2- is bonded in a 6-coordinate geometry to two equivalent Rb1+ and four equivalent Fe+2.50+ atoms.