Materials Data on Tl2FeCu3S4 by Materials Project
FeCu3Tl2S4 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. Fe3+ is bonded to four equivalent S2- atoms to form FeS4 tetrahedra that share corners with four equivalent FeS4 tetrahedra and edges with four equivalent CuS4 tetrahedra. All Fe–S bond lengths are 2.35 Å. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four equivalent S2- atoms to form a mixture of edge and corner-sharing CuS4 tetrahedra. All Cu–S bond lengths are 2.37 Å. In the second Cu1+ site, Cu1+ is bonded to four equivalent S2- atoms to form CuS4 tetrahedra that share corners with four equivalent CuS4 tetrahedra and edges with four equivalent FeS4 tetrahedra. All Cu–S bond lengths are 2.35 Å. Tl1+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are four shorter (3.28 Å) and four longer (3.53 Å) Tl–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to two equivalent Fe3+, two equivalent Cu1+, and four equivalent Tl1+ atoms. In the second S2- site, S2- is bonded in a 4-coordinate geometry to four equivalent Cu1+ and four equivalent Tl1+ atoms.