Tb3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), four equivalent Ni(6), and four equivalent Ni(7) atoms. In the second Tb site, Tb(2) is bonded in a 20-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), four equivalent Ni(5), four equivalent Ni(7), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to two equivalent Tb(1) and four equivalent B(3) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to two equivalent Tb(2), two equivalent Ni(5), two equivalent B(1), and two equivalent B(2) atoms. In the third Ni site, Ni(3) is bonded in a 6-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 13-coordinate geometry to two equivalent Tb(2), one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(7), two equivalent Ni(6), two equivalent B(2), and two equivalent B(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), one B(1), one B(3), and two equivalent B(2) atoms. In the seventh Ni site, Ni(7) is bonded in a 3-coordinate geometry to one Tb(1), two equivalent Tb(2), one Ni(5), one B(1), and two equivalent B(3) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), and one B(1) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Tb(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one B(2) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to one Tb(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms.
Tb3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), four equivalent Ni(6), and four equivalent Ni(7) atoms. Both Tb(1)-Ni(1) bond lengths are 2.89 Å. Both Tb(1)-Ni(3) bond lengths are 2.77 Å. Both Tb(1)-Ni(4) bond lengths are 2.83 Å. All Tb(1)-Ni(6) bond lengths are 2.78 Å. All Tb(1)-Ni(7) bond lengths are 2.89 Å. In the second Tb site, Tb(2) is bonded in a 20-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), four equivalent Ni(5), four equivalent Ni(7), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. The Tb(2)-Ni(3) bond length is 2.84 Å. The Tb(2)-Ni(4) bond length is 3.18 Å. There is one shorter (2.83 Å) and one longer (2.96 Å) Tb(2)-Ni(2) bond length. Both Tb(2)-Ni(6) bond lengths are 2.84 Å. There are two shorter (2.99 Å) and two longer (3.12 Å) Tb(2)-Ni(5) bond lengths. There are two shorter (2.96 Å) and two longer (3.06 Å) Tb(2)-Ni(7) bond lengths. Both Tb(2)-B(1) bond lengths are 2.92 Å. Both Tb(2)-B(2) bond lengths are 2.86 Å. Both Tb(2)-B(3) bond lengths are 2.79 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to two equivalent Tb(1) and four equivalent B(3) atoms. All Ni(1)-B(3) bond lengths are 2.26 Å. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to two equivalent Tb(2), two equivalent Ni(5), two equivalent B(1), and two equivalent B(2) atoms. Both Ni(2)-Ni(5) bond lengths are 2.64 Å. Both Ni(2)-B(1) bond lengths are 2.05 Å. Both Ni(2)-B(2) bond lengths are 2.13 Å. In the third Ni site, Ni(3) is bonded in a 6-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. Both Ni(3)-Ni(5) bond lengths are 2.42 Å. Both Ni(3)-B(2) bond lengths are 2.10 Å. Both Ni(3)-B(3) bond lengths are 2.31 Å. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. Both Ni(4)-Ni(5) bond lengths are 2.44 Å. Both Ni(4)-B(2) bond lengths are 2.12 Å. Both Ni(4)-B(3) bond lengths are 2.03 Å. In the fifth Ni site, Ni(5) is bonded in a 13-coordinate geometry to two equivalent Tb(2), one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(7), two equivalent Ni(6), two equivalent B(2), and two equivalent B(3) atoms. The Ni(5)-Ni(5) bond length is 2.46 Å. The Ni(5)-Ni(7) bond length is 2.49 Å. There is one shorter (2.39 Å) and one longer (2.51 Å) Ni(5)-Ni(6) bond length. There is one shorter (2.15 Å) and one longer (2.26 Å) Ni(5)-B(2) bond length. There is one shorter (2.14 Å) and one longer (2.33 Å) Ni(5)-B(3) bond length. In the sixth Ni site, Ni(6) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), two equivalent Ni(5), one B(1), one B(3), and two equivalent B(2) atoms. The Ni(6)-B(1) bond length is 2.08 Å. The Ni(6)-B(3) bond length is 2.16 Å. There is one shorter (2.10 Å) and one longer (2.13 Å) Ni(6)-B(2) bond length. In the seventh Ni site, Ni(7) is bonded in a 3-coordinate geometry to one Tb(1), two equivalent Tb(2), one Ni(5), one B(1), and two equivalent B(3) atoms. The Ni(7)-B(1) bond length is 2.10 Å. There is one shorter (2.07 Å) and one longer (2.17 Å) Ni(7)-B(3) bond length. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), and one B(1) atom. The B(1)-B(1) bond length is 2.02 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Tb(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one B(2) atom. The B(2)-B(2) bond length is 1.81 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to one Tb(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms.