Fe4CoB2Si crystallizes in the tetragonal I4/mcm space group. Fe(1) is bonded in a 5-coordinate geometry to three equivalent B(1) and two equivalent Si(1) atoms. Co(1) is bonded in a distorted square co-planar geometry to four equivalent B(1) and two equivalent Si(1) atoms. B(1) is bonded in a 9-coordinate geometry to six equivalent Fe(1), two equivalent Co(1), and one B(1) atom. Si(1) is bonded in a 10-coordinate geometry to eight equivalent Fe(1) and two equivalent Co(1) atoms.
Fe4CoB2Si crystallizes in the tetragonal I4/mcm space group. Fe(1) is bonded in a 5-coordinate geometry to three equivalent B(1) and two equivalent Si(1) atoms. There are two shorter (2.12 Å) and one longer (2.17 Å) Fe(1)-B(1) bond length. Both Fe(1)-Si(1) bond lengths are 2.35 Å. Co(1) is bonded in a distorted square co-planar geometry to four equivalent B(1) and two equivalent Si(1) atoms. All Co(1)-B(1) bond lengths are 2.18 Å. Both Co(1)-Si(1) bond lengths are 2.57 Å. B(1) is bonded in a 9-coordinate geometry to six equivalent Fe(1), two equivalent Co(1), and one B(1) atom. The B(1)-B(1) bond length is 1.87 Å. Si(1) is bonded in a 10-coordinate geometry to eight equivalent Fe(1) and two equivalent Co(1) atoms.