Ho6Ni20P13 crystallizes in the hexagonal P-6 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 16-coordinate geometry to one Ni(1), one Ni(8), two equivalent Ni(2), two equivalent Ni(5), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), and four equivalent P(1) atoms. In the second Ho site, Ho(2) is bonded in a 15-coordinate geometry to one Ni(6), two equivalent Ni(4), two equivalent Ni(5), two equivalent Ni(7), two equivalent Ni(8), two equivalent P(4), and four equivalent P(3) atoms. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ho(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted NiHoP4 tetrahedra that share  a cornercorner with one Ni(5)Ho4P4 tetrahedra, corners with four equivalent Ni(1)HoP4 tetrahedra,  an edgeedge with one Ni(5)Ho4P4 tetrahedra, edges with two equivalent Ni(7)Ho4P4 tetrahedra, and faces with two equivalent Ni(6)Ho3P4 tetrahedra. In the second Ni site, Ni(2) is bonded in a distorted trigonal planar geometry to six equivalent Ho(1) and three equivalent P(1) atoms. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(5) atoms. In the fourth Ni site, Ni(4) is bonded in a distorted trigonal planar geometry to six equivalent Ho(2) and three equivalent P(3) atoms. In the fifth Ni site, Ni(5) is bonded to two equivalent Ho(1), two equivalent Ho(2), one P(3), one P(4), and two equivalent P(1) atoms to form distorted NiHo4P4 tetrahedra that share  a cornercorner with one Ni(1)HoP4 tetrahedra, corners with two equivalent Ni(6)Ho3P4 tetrahedra, corners with two equivalent Ni(5)Ho4P4 tetrahedra, corners with four equivalent Ni(7)Ho4P4 tetrahedra,  an edgeedge with one Ni(1)HoP4 tetrahedra, edges with two equivalent Ni(5)Ho4P4 tetrahedra, faces with two equivalent Ni(6)Ho3P4 tetrahedra, and faces with two equivalent Ni(7)Ho4P4 tetrahedra. In the sixth Ni site, Ni(6) is bonded to one Ho(2), two equivalent Ho(1), one P(1), one P(2), and two equivalent P(4) atoms to form distorted NiHo3P4 tetrahedra that share corners with two equivalent Ni(5)Ho4P4 tetrahedra, corners with three equivalent Ni(7)Ho4P4 tetrahedra,  an edgeedge with one Ni(7)Ho4P4 tetrahedra, edges with two equivalent Ni(6)Ho3P4 tetrahedra,  a faceface with one Ni(7)Ho4P4 tetrahedra, faces with two equivalent Ni(5)Ho4P4 tetrahedra, and faces with two equivalent Ni(1)HoP4 tetrahedra. In the seventh Ni site, Ni(7) is bonded to two equivalent Ho(1), two equivalent Ho(2), one P(1), one P(2), and two equivalent P(3) atoms to form distorted NiHo4P4 tetrahedra that share corners with two equivalent Ni(7)Ho4P4 tetrahedra, corners with three equivalent Ni(6)Ho3P4 tetrahedra, corners with four equivalent Ni(5)Ho4P4 tetrahedra,  an edgeedge with one Ni(6)Ho3P4 tetrahedra, edges with two equivalent Ni(7)Ho4P4 tetrahedra, edges with two equivalent Ni(1)HoP4 tetrahedra,  a faceface with one Ni(6)Ho3P4 tetrahedra, and faces with two equivalent Ni(5)Ho4P4 tetrahedra. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to one Ho(1), two equivalent Ho(2), one P(3), one P(4), and two equivalent P(2) atoms. There are five inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Ho(2), one Ni(4), one Ni(5), one Ni(8), and two equivalent Ni(7) atoms. In the second P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Ho(2), one Ni(1), one Ni(5), one Ni(8), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(5) is bonded in a 9-coordinate geometry to three equivalent Ni(1) and six equivalent Ni(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ni(2), one Ni(6), one Ni(7), and two equivalent Ni(5) atoms. In the fifth P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(8) atoms.
Ho6Ni20P13 crystallizes in the hexagonal P-6 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 16-coordinate geometry to one Ni(1), one Ni(8), two equivalent Ni(2), two equivalent Ni(5), two equivalent Ni(6), two equivalent Ni(7), two equivalent P(2), and four equivalent P(1) atoms. The Ho(1)-Ni(1) bond length is 3.05 Å. The Ho(1)-Ni(8) bond length is 3.17 Å. Both Ho(1)-Ni(2) bond lengths are 2.89 Å. There is one shorter (3.09 Å) and one longer (3.10 Å) Ho(1)-Ni(5) bond length. Both Ho(1)-Ni(6) bond lengths are 3.03 Å. Both Ho(1)-Ni(7) bond lengths are 3.02 Å. Both Ho(1)-P(2) bond lengths are 2.85 Å. There are two shorter (2.88 Å) and two longer (2.91 Å) Ho(1)-P(1) bond lengths. In the second Ho site, Ho(2) is bonded in a 15-coordinate geometry to one Ni(6), two equivalent Ni(4), two equivalent Ni(5), two equivalent Ni(7), two equivalent Ni(8), two equivalent P(4), and four equivalent P(3) atoms. The Ho(2)-Ni(6) bond length is 3.06 Å. Both Ho(2)-Ni(4) bond lengths are 2.90 Å. Both Ho(2)-Ni(5) bond lengths are 3.02 Å. There is one shorter (3.10 Å) and one longer (3.13 Å) Ho(2)-Ni(7) bond length. Both Ho(2)-Ni(8) bond lengths are 2.97 Å. Both Ho(2)-P(4) bond lengths are 2.82 Å. There are two shorter (2.89 Å) and two longer (2.90 Å) Ho(2)-P(3) bond lengths. There are eight inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ho(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted NiHoP4 tetrahedra that share  a cornercorner with one Ni(5)Ho4P4 tetrahedra, corners with four equivalent Ni(1)HoP4 tetrahedra,  an edgeedge with one Ni(5)Ho4P4 tetrahedra, edges with two equivalent Ni(7)Ho4P4 tetrahedra, and faces with two equivalent Ni(6)Ho3P4 tetrahedra. The Ni(1)-P(4) bond length is 2.22 Å. The Ni(1)-P(5) bond length is 2.14 Å. Both Ni(1)-P(2) bond lengths are 2.35 Å. In the second Ni site, Ni(2) is bonded in a distorted trigonal planar geometry to six equivalent Ho(1) and three equivalent P(1) atoms. All Ni(2)-P(1) bond lengths are 2.21 Å. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(4), and two equivalent P(5) atoms. The Ni(3)-P(2) bond length is 2.27 Å. Both Ni(3)-P(4) bond lengths are 2.58 Å. Both Ni(3)-P(5) bond lengths are 2.55 Å. In the fourth Ni site, Ni(4) is bonded in a distorted trigonal planar geometry to six equivalent Ho(2) and three equivalent P(3) atoms. All Ni(4)-P(3) bond lengths are 2.21 Å. In the fifth Ni site, Ni(5) is bonded to two equivalent Ho(1), two equivalent Ho(2), one P(3), one P(4), and two equivalent P(1) atoms to form distorted NiHo4P4 tetrahedra that share  a cornercorner with one Ni(1)HoP4 tetrahedra, corners with two equivalent Ni(6)Ho3P4 tetrahedra, corners with two equivalent Ni(5)Ho4P4 tetrahedra, corners with four equivalent Ni(7)Ho4P4 tetrahedra,  an edgeedge with one Ni(1)HoP4 tetrahedra, edges with two equivalent Ni(5)Ho4P4 tetrahedra, faces with two equivalent Ni(6)Ho3P4 tetrahedra, and faces with two equivalent Ni(7)Ho4P4 tetrahedra. The Ni(5)-P(3) bond length is 2.28 Å. The Ni(5)-P(4) bond length is 2.27 Å. Both Ni(5)-P(1) bond lengths are 2.29 Å. In the sixth Ni site, Ni(6) is bonded to one Ho(2), two equivalent Ho(1), one P(1), one P(2), and two equivalent P(4) atoms to form distorted NiHo3P4 tetrahedra that share corners with two equivalent Ni(5)Ho4P4 tetrahedra, corners with three equivalent Ni(7)Ho4P4 tetrahedra,  an edgeedge with one Ni(7)Ho4P4 tetrahedra, edges with two equivalent Ni(6)Ho3P4 tetrahedra,  a faceface with one Ni(7)Ho4P4 tetrahedra, faces with two equivalent Ni(5)Ho4P4 tetrahedra, and faces with two equivalent Ni(1)HoP4 tetrahedra. The Ni(6)-P(1) bond length is 2.29 Å. The Ni(6)-P(2) bond length is 2.32 Å. Both Ni(6)-P(4) bond lengths are 2.30 Å. In the seventh Ni site, Ni(7) is bonded to two equivalent Ho(1), two equivalent Ho(2), one P(1), one P(2), and two equivalent P(3) atoms to form distorted NiHo4P4 tetrahedra that share corners with two equivalent Ni(7)Ho4P4 tetrahedra, corners with three equivalent Ni(6)Ho3P4 tetrahedra, corners with four equivalent Ni(5)Ho4P4 tetrahedra,  an edgeedge with one Ni(6)Ho3P4 tetrahedra, edges with two equivalent Ni(7)Ho4P4 tetrahedra, edges with two equivalent Ni(1)HoP4 tetrahedra,  a faceface with one Ni(6)Ho3P4 tetrahedra, and faces with two equivalent Ni(5)Ho4P4 tetrahedra. The Ni(7)-P(1) bond length is 2.29 Å. The Ni(7)-P(2) bond length is 2.24 Å. Both Ni(7)-P(3) bond lengths are 2.30 Å. In the eighth Ni site, Ni(8) is bonded in a 4-coordinate geometry to one Ho(1), two equivalent Ho(2), one P(3), one P(4), and two equivalent P(2) atoms. The Ni(8)-P(3) bond length is 2.27 Å. The Ni(8)-P(4) bond length is 2.24 Å. Both Ni(8)-P(2) bond lengths are 2.35 Å. There are five inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Ho(2), one Ni(4), one Ni(5), one Ni(8), and two equivalent Ni(7) atoms. In the second P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Ho(2), one Ni(1), one Ni(5), one Ni(8), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(5) is bonded in a 9-coordinate geometry to three equivalent Ni(1) and six equivalent Ni(3) atoms. In the fourth P site, P(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ni(2), one Ni(6), one Ni(7), and two equivalent Ni(5) atoms. In the fifth P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(8) atoms.