Materials Data on Fe2CoSe4 by Materials Project
Fe2CoSe4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of Fe–Se bond distances ranging from 2.32–2.79 Å. In the second Fe3+ site, Fe3+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of Fe–Se bond distances ranging from 2.32–2.81 Å. Co2+ is bonded to six Se2- atoms to form distorted corner-sharing CoSe6 octahedra. The corner-sharing octahedra tilt angles range from 13–31°. There are a spread of Co–Se bond distances ranging from 2.37–2.72 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to three Fe3+ and two equivalent Co2+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to three Fe3+ and two equivalent Co2+ atoms. In the third Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to three Fe3+ and one Co2+ atom. In the fourth Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to three Fe3+ and one Co2+ atom.