FeSe is Modderite structured and crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to six equivalent Se(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles range from 47-59°. Se(1) is bonded in a 6-coordinate geometry to six equivalent Fe(1) atoms.
FeSe is Modderite structured and crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to six equivalent Se(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles range from 47-59°. There are a spread of Fe(1)-Se(1) bond distances ranging from 2.42-2.60 Å. Se(1) is bonded in a 6-coordinate geometry to six equivalent Fe(1) atoms.