Fe2C crystallizes in the orthorhombic Pnma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. In the second Fe site, Fe(2) is bonded in a 4-coordinate geometry to four equivalent C(1) atoms. C(1) is bonded in a 7-coordinate geometry to three equivalent Fe(1) and four equivalent Fe(2) atoms.
Fe2C crystallizes in the orthorhombic Pnma space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. There are two shorter (1.94 Å) and one longer (1.98 Å) Fe(1)-C(1) bond length. In the second Fe site, Fe(2) is bonded in a 4-coordinate geometry to four equivalent C(1) atoms. There are two shorter (2.06 Å) and two longer (2.17 Å) Fe(2)-C(1) bond lengths. C(1) is bonded in a 7-coordinate geometry to three equivalent Fe(1) and four equivalent Fe(2) atoms.