Materials Data on KFeCuSe2 by Materials Project
KCuFeSe2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I-4m2 space group. The structure is three-dimensional. K1+ is bonded in a body-centered cubic geometry to eight equivalent Se2- atoms. All K–Se bond lengths are 3.43 Å. Fe2+ is bonded to four equivalent Se2- atoms to form FeSe4 tetrahedra that share corners with four equivalent FeSe4 tetrahedra and edges with four equivalent CuSe4 tetrahedra. All Fe–Se bond lengths are 2.42 Å. Cu1+ is bonded to four equivalent Se2- atoms to form CuSe4 tetrahedra that share corners with four equivalent CuSe4 tetrahedra and edges with four equivalent FeSe4 tetrahedra. All Cu–Se bond lengths are 2.42 Å. Se2- is bonded in a 8-coordinate geometry to four equivalent K1+, two equivalent Fe2+, and two equivalent Cu1+ atoms.