Ho2Co7B3 crystallizes in the hexagonal P6/mmm space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 20-coordinate geometry to two equivalent Ho(2), twelve equivalent Co(2), and six equivalent B(2) atoms. In the second Ho site, Ho(2) is bonded in a 18-coordinate geometry to one Ho(1), six equivalent Co(2), six equivalent Co(3), and six equivalent B(1) atoms. In the third Ho site, Ho(3) is bonded in a 6-coordinate geometry to six equivalent Co(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Ho(3) and six equivalent Co(3) atoms. In the second Co site, Co(2) is bonded in a distorted square co-planar geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent B(1), and two equivalent B(2) atoms. In the third Co site, Co(3) is bonded in a distorted L-shaped geometry to two equivalent Ho(2), two equivalent Co(1), and two equivalent B(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Ho(2), three equivalent Co(2), and three equivalent Co(3) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ho(1) and six equivalent Co(2) atoms.
Ho2Co7B3 crystallizes in the hexagonal P6/mmm space group. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 20-coordinate geometry to two equivalent Ho(2), twelve equivalent Co(2), and six equivalent B(2) atoms. Both Ho(1)-Ho(2) bond lengths are 3.06 Å. All Ho(1)-Co(2) bond lengths are 2.91 Å. All Ho(1)-B(2) bond lengths are 2.89 Å. In the second Ho site, Ho(2) is bonded in a 18-coordinate geometry to one Ho(1), six equivalent Co(2), six equivalent Co(3), and six equivalent B(1) atoms. All Ho(2)-Co(2) bond lengths are 2.95 Å. All Ho(2)-Co(3) bond lengths are 2.85 Å. All Ho(2)-B(1) bond lengths are 2.89 Å. In the third Ho site, Ho(3) is bonded in a 6-coordinate geometry to six equivalent Co(1) atoms. All Ho(3)-Co(1) bond lengths are 2.89 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Ho(3) and six equivalent Co(3) atoms. All Co(1)-Co(3) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded in a distorted square co-planar geometry to two equivalent Ho(1), two equivalent Ho(2), two equivalent B(1), and two equivalent B(2) atoms. Both Co(2)-B(1) bond lengths are 2.07 Å. Both Co(2)-B(2) bond lengths are 2.07 Å. In the third Co site, Co(3) is bonded in a distorted L-shaped geometry to two equivalent Ho(2), two equivalent Co(1), and two equivalent B(1) atoms. Both Co(3)-B(1) bond lengths are 2.05 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Ho(2), three equivalent Co(2), and three equivalent Co(3) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ho(1) and six equivalent Co(2) atoms.