Ho3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 20-coordinate geometry to one Ni(1), one Ni(5), two equivalent Ni(3), two equivalent Ni(6), four equivalent Ni(2), four equivalent Ni(4), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. In the second Ho site, Ho(2) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), two equivalent Ni(7), four equivalent Ni(3), and four equivalent Ni(4) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 5-coordinate geometry to one Ho(1), one Ho(2), one Ni(5), two equivalent B(1), and two equivalent B(2) atoms. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one Ni(5), two equivalent B(1), and two equivalent B(2) atoms. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one B(1), one B(3), and two equivalent B(2) atoms. In the fourth Ni site, Ni(4) is bonded in a 3-coordinate geometry to one Ho(2), two equivalent Ho(1), one B(3), and two equivalent B(1) atoms. In the fifth Ni site, Ni(5) is bonded in a 10-coordinate geometry to one Ho(1), one Ho(2), one Ni(1), one Ni(7), two equivalent Ni(2), two equivalent B(1), and two equivalent B(2) atoms. In the sixth Ni site, Ni(6) is bonded in a 5-coordinate geometry to two equivalent Ho(1), two equivalent B(2), and two equivalent B(3) atoms. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ho(2), two equivalent Ni(5), and four equivalent B(1) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Ho(1), one Ni(1), one Ni(5), one Ni(6), two equivalent Ni(2), two equivalent Ni(3), and one B(2) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(6), and one B(3) atom.
Ho3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 20-coordinate geometry to one Ni(1), one Ni(5), two equivalent Ni(3), two equivalent Ni(6), four equivalent Ni(2), four equivalent Ni(4), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. The Ho(1)-Ni(1) bond length is 3.17 Å. The Ho(1)-Ni(5) bond length is 2.85 Å. Both Ho(1)-Ni(3) bond lengths are 2.82 Å. There is one shorter (2.81 Å) and one longer (2.95 Å) Ho(1)-Ni(6) bond length. There are two shorter (2.97 Å) and two longer (3.12 Å) Ho(1)-Ni(2) bond lengths. There are two shorter (2.96 Å) and two longer (3.06 Å) Ho(1)-Ni(4) bond lengths. Both Ho(1)-B(1) bond lengths are 2.77 Å. Both Ho(1)-B(2) bond lengths are 2.85 Å. Both Ho(1)-B(3) bond lengths are 2.92 Å. In the second Ho site, Ho(2) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), two equivalent Ni(7), four equivalent Ni(3), and four equivalent Ni(4) atoms. Both Ho(2)-Ni(1) bond lengths are 2.82 Å. Both Ho(2)-Ni(5) bond lengths are 2.76 Å. Both Ho(2)-Ni(7) bond lengths are 2.88 Å. All Ho(2)-Ni(3) bond lengths are 2.77 Å. All Ho(2)-Ni(4) bond lengths are 2.88 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 5-coordinate geometry to one Ho(1), one Ho(2), one Ni(5), two equivalent B(1), and two equivalent B(2) atoms. The Ni(1)-Ni(5) bond length is 2.51 Å. Both Ni(1)-B(1) bond lengths are 2.03 Å. Both Ni(1)-B(2) bond lengths are 2.12 Å. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to two equivalent Ho(1), one Ni(5), two equivalent B(1), and two equivalent B(2) atoms. The Ni(2)-Ni(5) bond length is 2.41 Å. There is one shorter (2.12 Å) and one longer (2.34 Å) Ni(2)-B(1) bond length. There is one shorter (2.14 Å) and one longer (2.25 Å) Ni(2)-B(2) bond length. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one B(1), one B(3), and two equivalent B(2) atoms. The Ni(3)-B(1) bond length is 2.14 Å. The Ni(3)-B(3) bond length is 2.08 Å. There is one shorter (2.10 Å) and one longer (2.12 Å) Ni(3)-B(2) bond length. In the fourth Ni site, Ni(4) is bonded in a 3-coordinate geometry to one Ho(2), two equivalent Ho(1), one B(3), and two equivalent B(1) atoms. The Ni(4)-B(3) bond length is 2.09 Å. There is one shorter (2.06 Å) and one longer (2.17 Å) Ni(4)-B(1) bond length. In the fifth Ni site, Ni(5) is bonded in a 10-coordinate geometry to one Ho(1), one Ho(2), one Ni(1), one Ni(7), two equivalent Ni(2), two equivalent B(1), and two equivalent B(2) atoms. The Ni(5)-Ni(7) bond length is 2.41 Å. Both Ni(5)-B(1) bond lengths are 2.30 Å. Both Ni(5)-B(2) bond lengths are 2.09 Å. In the sixth Ni site, Ni(6) is bonded in a 5-coordinate geometry to two equivalent Ho(1), two equivalent B(2), and two equivalent B(3) atoms. Both Ni(6)-B(2) bond lengths are 2.12 Å. Both Ni(6)-B(3) bond lengths are 2.04 Å. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ho(2), two equivalent Ni(5), and four equivalent B(1) atoms. All Ni(7)-B(1) bond lengths are 2.26 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Ho(1), one Ni(1), one Ni(5), one Ni(6), two equivalent Ni(2), two equivalent Ni(3), and one B(2) atom. The B(2)-B(2) bond length is 1.80 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to two equivalent Ho(1), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(6), and one B(3) atom. The B(3)-B(3) bond length is 2.00 Å.