FeSe2 is Pyrite structured and crystallizes in the cubic Pa-3 space group. Fe(1) is bonded to six equivalent Se(1) atoms to form corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. Se(1) is bonded in a 3-coordinate geometry to three equivalent Fe(1) atoms.
FeSe2 is Pyrite structured and crystallizes in the cubic Pa-3 space group. Fe(1) is bonded to six equivalent Se(1) atoms to form corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. All Fe(1)-Se(1) bond lengths are 2.39 Å. Se(1) is bonded in a 3-coordinate geometry to three equivalent Fe(1) atoms.