Er3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Er sites. In the first Er site, Er(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 Er site, Er(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 Er(1), two equivalent Ni(3), and four equivalent B(3) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to two equivalent Er(2), two equivalent B(1), and two equivalent B(2) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Ni(1), one Ni(4), 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 4-coordinate geometry to one Er(1), one Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 4-coordinate geometry to two equivalent Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), 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 Er(1), two equivalent Er(2), 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 Er(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 Er(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 Er(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms.
Er3Ni19B10 crystallizes in the monoclinic C2/m space group. There are two inequivalent Er sites. In the first Er site, Er(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 Er(1)-Ni(1) bond lengths are 2.88 Å. Both Er(1)-Ni(3) bond lengths are 2.76 Å. Both Er(1)-Ni(4) bond lengths are 2.82 Å. All Er(1)-Ni(6) bond lengths are 2.76 Å. All Er(1)-Ni(7) bond lengths are 2.88 Å. In the second Er site, Er(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 Er(2)-Ni(3) bond length is 2.84 Å. The Er(2)-Ni(4) bond length is 3.18 Å. There is one shorter (2.81 Å) and one longer (2.95 Å) Er(2)-Ni(2) bond length. Both Er(2)-Ni(6) bond lengths are 2.81 Å. There are two shorter (2.97 Å) and two longer (3.11 Å) Er(2)-Ni(5) bond lengths. There are two shorter (2.94 Å) and two longer (3.05 Å) Er(2)-Ni(7) bond lengths. Both Er(2)-B(1) bond lengths are 2.90 Å. Both Er(2)-B(2) bond lengths are 2.84 Å. Both Er(2)-B(3) bond lengths are 2.76 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Ni(3), and four equivalent B(3) atoms. Both Ni(1)-Ni(3) bond lengths are 2.41 Å. 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 Er(2), two equivalent B(1), and two equivalent B(2) atoms. Both Ni(2)-B(1) bond lengths are 2.04 Å. Both Ni(2)-B(2) bond lengths are 2.12 Å. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Er(1), one Er(2), one Ni(1), one Ni(4), two equivalent Ni(5), two equivalent B(2), and two equivalent B(3) atoms. The Ni(3)-Ni(4) bond length is 2.51 Å. Both Ni(3)-Ni(5) bond lengths are 2.41 Å. Both Ni(3)-B(2) bond lengths are 2.09 Å. Both Ni(3)-B(3) bond lengths are 2.30 Å. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. 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 4-coordinate geometry to two equivalent Er(2), one Ni(3), two equivalent B(2), and two equivalent B(3) atoms. There is one shorter (2.14 Å) and one longer (2.25 Å) Ni(5)-B(2) bond length. There is one shorter (2.13 Å) and one longer (2.32 Å) Ni(5)-B(3) bond length. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Er(1), one Er(2), one B(1), one B(3), and two equivalent B(2) atoms. The Ni(6)-B(1) bond length is 2.07 Å. The Ni(6)-B(3) bond length is 2.14 Å. There is one shorter (2.09 Å) and one longer (2.12 Å) Ni(6)-B(2) bond length. In the seventh Ni site, Ni(7) is bonded in a 3-coordinate geometry to one Er(1), two equivalent Er(2), one B(1), and two equivalent B(3) atoms. The Ni(7)-B(1) bond length is 2.09 Å. There is one shorter (2.06 Å) and one longer (2.16 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 Er(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 2.00 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Er(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 1.80 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to one Er(2), one Ni(1), one Ni(3), one Ni(4), one Ni(6), two equivalent Ni(5), and two equivalent Ni(7) atoms.