Ho3Ni7B2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 12-coordinate geometry to one Ho(2), three equivalent Ni(2), and nine equivalent Ni(1) atoms. In the second Ho site, Ho(2) is bonded in a 20-coordinate geometry to two equivalent Ho(1), twelve equivalent Ni(1), three equivalent B(1), and three equivalent B(2) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted L-shaped geometry to two equivalent Ho(2), three equivalent Ho(1), one Ni(2), one B(1), and one B(2) atom. In the second Ni site, Ni(2) is bonded to six equivalent Ho(1) and six equivalent Ni(1) atoms to form edge-sharing NiHo6Ni6 cuboctahedra. 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) and six equivalent Ni(1) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ho(2) and six equivalent Ni(1) atoms.
Ho3Ni7B2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 12-coordinate geometry to one Ho(2), three equivalent Ni(2), and nine equivalent Ni(1) atoms. The Ho(1)-Ho(2) bond length is 3.08 Å. All Ho(1)-Ni(2) bond lengths are 2.93 Å. There are three shorter (2.94 Å) and six longer (3.00 Å) Ho(1)-Ni(1) bond lengths. In the second Ho site, Ho(2) is bonded in a 20-coordinate geometry to two equivalent Ho(1), twelve equivalent Ni(1), three equivalent B(1), and three equivalent B(2) atoms. All Ho(2)-Ni(1) bond lengths are 2.89 Å. All Ho(2)-B(1) bond lengths are 2.90 Å. All Ho(2)-B(2) bond lengths are 2.90 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted L-shaped geometry to two equivalent Ho(2), three equivalent Ho(1), one Ni(2), one B(1), and one B(2) atom. The Ni(1)-Ni(2) bond length is 2.55 Å. The Ni(1)-B(1) bond length is 2.05 Å. The Ni(1)-B(2) bond length is 2.03 Å. In the second Ni site, Ni(2) is bonded to six equivalent Ho(1) and six equivalent Ni(1) atoms to form edge-sharing NiHo6Ni6 cuboctahedra. 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) and six equivalent Ni(1) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ho(2) and six equivalent Ni(1) atoms.