U4Ni11Ga20 crystallizes in the triclinic P1 space group. There are four inequivalent U sites. In the first U site, U(1) is bonded in a 15-coordinate geometry to two equivalent Ni(11), two equivalent Ni(2), one Ga(10), one Ga(15), one Ga(17), one Ga(2), one Ga(4), two equivalent Ga(14), two equivalent Ga(7), and two equivalent Ga(8) atoms. In the second U site, U(2) is bonded in a 14-coordinate geometry to two equivalent Ni(3), two equivalent Ni(6), one Ga(1), one Ga(16), one Ga(18), one Ga(9), two equivalent Ga(13), two equivalent Ga(19), and two equivalent Ga(6) atoms. In the third U site, U(3) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(8), one Ga(10), one Ga(13), one Ga(3), one Ga(7), two equivalent Ga(16), two equivalent Ga(20), and two equivalent Ga(4) atoms. In the fourth U site, U(4) is bonded in a 15-coordinate geometry to two equivalent Ni(10), two equivalent Ni(9), one Ga(1), one Ga(12), one Ga(5), one Ga(6), one Ga(8), two equivalent Ga(11), two equivalent Ga(18), and two equivalent Ga(2) atoms. There are eleven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent U(3), one Ga(12), one Ga(15), one Ga(16), one Ga(4), two equivalent Ga(3), and two equivalent Ga(7) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ga(14), one Ga(7), one Ga(9), two equivalent Ga(10), and two equivalent Ga(15) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent U(2), one Ga(12), one Ga(13), one Ga(15), one Ga(6), two equivalent Ga(18), and two equivalent Ga(9) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Ni(5), one Ga(10), one Ga(17), one Ga(5), two equivalent Ga(14), and two equivalent Ga(20) atoms. In the fifth Ni site, Ni(5) is bonded to two equivalent Ni(4), two equivalent Ni(7), one Ga(11), one Ga(14), one Ga(19), one Ga(20), two equivalent Ga(17), and two equivalent Ga(5) atoms to form distorted face-sharing NiGa8Ni4 cuboctahedra. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ga(13), one Ga(19), one Ga(3), two equivalent Ga(1), and two equivalent Ga(16) atoms. In the seventh Ni site, Ni(7) is bonded in a 9-coordinate geometry to two equivalent Ni(5), one Ga(1), one Ga(17), one Ga(5), two equivalent Ga(11), and two equivalent Ga(19) atoms. In the eighth Ni site, Ni(8) is bonded in a 9-coordinate geometry to two equivalent U(3), one Ga(16), one Ga(20), one Ga(9), two equivalent Ga(10), and two equivalent Ga(13) atoms. In the ninth Ni site, Ni(9) is bonded in a 7-coordinate geometry to two equivalent U(4), one Ga(17), one Ga(18), one Ga(2), two equivalent Ga(6), and two equivalent Ga(8) atoms. In the tenth Ni site, Ni(10) is bonded in a 9-coordinate geometry to two equivalent U(4), one Ga(11), one Ga(18), one Ga(3), two equivalent Ga(1), and two equivalent Ga(12) atoms. In the eleventh Ni site, Ni(11) is bonded in a 7-coordinate geometry to two equivalent U(1), one Ga(5), one Ga(7), one Ga(8), two equivalent Ga(2), and two equivalent Ga(4) atoms. There are twenty inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 5-coordinate geometry to one U(2), one U(4), one Ni(7), two equivalent Ni(10), two equivalent Ni(6), one Ga(12), and one Ga(16) atom. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), two equivalent U(4), one Ni(9), two equivalent Ni(11), one Ga(4), and two equivalent Ga(8) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one U(3), one Ni(10), one Ni(6), two equivalent Ni(1), one Ga(7), two equivalent Ga(12), and two equivalent Ga(16) atoms. In the fourth Ga site, Ga(4) is bonded in a 8-coordinate geometry to one U(1), two equivalent U(3), one Ni(1), two equivalent Ni(11), one Ga(2), one Ga(20), and two equivalent Ga(7) atoms. In the fifth Ga site, Ga(5) is bonded in a 3-coordinate geometry to one U(4), one Ni(11), one Ni(4), one Ni(7), and two equivalent Ni(5) atoms. In the sixth Ga site, Ga(6) is bonded in a 8-coordinate geometry to one U(4), two equivalent U(2), one Ni(3), two equivalent Ni(9), one Ga(19), one Ga(8), and two equivalent Ga(18) atoms. In the seventh Ga site, Ga(7) is bonded in a 12-coordinate geometry to one U(3), two equivalent U(1), one Ni(11), one Ni(2), two equivalent Ni(1), one Ga(3), two equivalent Ga(15), and two equivalent Ga(4) atoms. In the eighth Ga site, Ga(8) is bonded in a 10-coordinate geometry to one U(4), two equivalent U(1), one Ni(11), two equivalent Ni(9), one Ga(14), one Ga(6), and two equivalent Ga(2) atoms. In the ninth Ga site, Ga(9) is bonded in a 10-coordinate geometry to one U(2), one Ni(2), one Ni(8), two equivalent Ni(3), one Ga(18), two equivalent Ga(13), and two equivalent Ga(15) atoms. In the tenth Ga site, Ga(10) is bonded in a 5-coordinate geometry to one U(1), one U(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(8), one Ga(13), and one Ga(15) atom. In the eleventh Ga site, Ga(11) is bonded in a 6-coordinate geometry to two equivalent U(4), one Ni(10), one Ni(5), and two equivalent Ni(7) atoms. In the twelfth Ga site, Ga(12) is bonded in a 11-coordinate geometry to one U(4), one Ni(1), one Ni(3), two equivalent Ni(10), one Ga(1), one Ga(15), two equivalent Ga(18), and two equivalent Ga(3) atoms. In the thirteenth Ga site, Ga(13) is bonded in a 12-coordinate geometry to one U(3), two equivalent U(2), one Ni(3), one Ni(6), two equivalent Ni(8), one Ga(10), two equivalent Ga(16), and two equivalent Ga(9) atoms. In the fourteenth Ga site, Ga(14) is bonded in a 6-coordinate geometry to two equivalent U(1), one Ni(2), one Ni(5), two equivalent Ni(4), and one Ga(8) atom. In the fifteenth Ga site, Ga(15) is bonded in a 11-coordinate geometry to one U(1), one Ni(1), one Ni(3), two equivalent Ni(2), one Ga(10), one Ga(12), two equivalent Ga(7), and two equivalent Ga(9) atoms. In the sixteenth Ga site, Ga(16) is bonded in a 12-coordinate geometry to one U(2), two equivalent U(3), one Ni(1), one Ni(8), two equivalent Ni(6), one Ga(1), two equivalent Ga(13), and two equivalent Ga(3) atoms. In the seventeenth Ga site, Ga(17) is bonded in a 3-coordinate geometry to one U(1), one Ni(4), one Ni(7), one Ni(9), and two equivalent Ni(5) atoms. In the eighteenth Ga site, Ga(18) is bonded in a 12-coordinate geometry to one U(2), two equivalent U(4), one Ni(10), one Ni(9), two equivalent Ni(3), one Ga(9), two equivalent Ga(12), and two equivalent Ga(6) atoms. In the nineteenth Ga site, Ga(19) is bonded in a 6-coordinate geometry to two equivalent U(2), one Ni(5), one Ni(6), two equivalent Ni(7), and one Ga(6) atom. In the twentieth Ga site, Ga(20) is bonded in a 6-coordinate geometry to two equivalent U(3), one Ni(5), one Ni(8), two equivalent Ni(4), and one Ga(4) atom.
U4Ni11Ga20 crystallizes in the triclinic P1 space group. There are four inequivalent U sites. In the first U site, U(1) is bonded in a 15-coordinate geometry to two equivalent Ni(11), two equivalent Ni(2), one Ga(10), one Ga(15), one Ga(17), one Ga(2), one Ga(4), two equivalent Ga(14), two equivalent Ga(7), and two equivalent Ga(8) atoms. There is one shorter (3.16 Å) and one longer (3.17 Å) U(1)-Ni(11) bond length. There is one shorter (2.91 Å) and one longer (2.95 Å) U(1)-Ni(2) bond length. The U(1)-Ga(10) bond length is 3.14 Å. The U(1)-Ga(15) bond length is 3.05 Å. The U(1)-Ga(17) bond length is 3.45 Å. The U(1)-Ga(2) bond length is 3.11 Å. The U(1)-Ga(4) bond length is 3.08 Å. There is one shorter (2.94 Å) and one longer (2.95 Å) U(1)-Ga(14) bond length. There is one shorter (3.01 Å) and one longer (3.03 Å) U(1)-Ga(7) bond length. There is one shorter (2.98 Å) and one longer (2.99 Å) U(1)-Ga(8) bond length. In the second U site, U(2) is bonded in a 14-coordinate geometry to two equivalent Ni(3), two equivalent Ni(6), one Ga(1), one Ga(16), one Ga(18), one Ga(9), two equivalent Ga(13), two equivalent Ga(19), and two equivalent Ga(6) atoms. There is one shorter (3.18 Å) and one longer (3.20 Å) U(2)-Ni(3) bond length. There is one shorter (3.02 Å) and one longer (3.03 Å) U(2)-Ni(6) bond length. The U(2)-Ga(1) bond length is 3.16 Å. The U(2)-Ga(16) bond length is 3.15 Å. The U(2)-Ga(18) bond length is 3.16 Å. The U(2)-Ga(9) bond length is 3.03 Å. Both U(2)-Ga(13) bond lengths are 3.02 Å. Both U(2)-Ga(19) bond lengths are 2.94 Å. There is one shorter (2.94 Å) and one longer (2.96 Å) U(2)-Ga(6) bond length. In the third U site, U(3) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(8), one Ga(10), one Ga(13), one Ga(3), one Ga(7), two equivalent Ga(16), two equivalent Ga(20), and two equivalent Ga(4) atoms. Both U(3)-Ni(1) bond lengths are 3.19 Å. There is one shorter (2.99 Å) and one longer (3.02 Å) U(3)-Ni(8) bond length. The U(3)-Ga(10) bond length is 3.14 Å. The U(3)-Ga(13) bond length is 3.15 Å. The U(3)-Ga(3) bond length is 3.04 Å. The U(3)-Ga(7) bond length is 3.17 Å. There is one shorter (3.01 Å) and one longer (3.03 Å) U(3)-Ga(16) bond length. Both U(3)-Ga(20) bond lengths are 2.95 Å. Both U(3)-Ga(4) bond lengths are 2.95 Å. In the fourth U site, U(4) is bonded in a 15-coordinate geometry to two equivalent Ni(10), two equivalent Ni(9), one Ga(1), one Ga(12), one Ga(5), one Ga(6), one Ga(8), two equivalent Ga(11), two equivalent Ga(18), and two equivalent Ga(2) atoms. There is one shorter (2.93 Å) and one longer (2.94 Å) U(4)-Ni(10) bond length. There is one shorter (3.17 Å) and one longer (3.21 Å) U(4)-Ni(9) bond length. The U(4)-Ga(1) bond length is 3.12 Å. The U(4)-Ga(12) bond length is 3.06 Å. The U(4)-Ga(5) bond length is 3.43 Å. The U(4)-Ga(6) bond length is 3.11 Å. The U(4)-Ga(8) bond length is 3.12 Å. There is one shorter (2.93 Å) and one longer (2.94 Å) U(4)-Ga(11) bond length. Both U(4)-Ga(18) bond lengths are 3.02 Å. There is one shorter (2.97 Å) and one longer (2.99 Å) U(4)-Ga(2) bond length. There are eleven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent U(3), one Ga(12), one Ga(15), one Ga(16), one Ga(4), two equivalent Ga(3), and two equivalent Ga(7) atoms. The Ni(1)-Ga(12) bond length is 2.73 Å. The Ni(1)-Ga(15) bond length is 2.54 Å. The Ni(1)-Ga(16) bond length is 2.59 Å. The Ni(1)-Ga(4) bond length is 2.54 Å. There is one shorter (2.49 Å) and one longer (2.51 Å) Ni(1)-Ga(3) bond length. Both Ni(1)-Ga(7) bond lengths are 2.50 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ga(14), one Ga(7), one Ga(9), two equivalent Ga(10), and two equivalent Ga(15) atoms. The Ni(2)-Ga(14) bond length is 2.51 Å. The Ni(2)-Ga(7) bond length is 2.50 Å. The Ni(2)-Ga(9) bond length is 2.43 Å. There is one shorter (2.59 Å) and one longer (2.62 Å) Ni(2)-Ga(10) bond length. There is one shorter (2.56 Å) and one longer (2.60 Å) Ni(2)-Ga(15) bond length. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent U(2), one Ga(12), one Ga(13), one Ga(15), one Ga(6), two equivalent Ga(18), and two equivalent Ga(9) atoms. The Ni(3)-Ga(12) bond length is 2.51 Å. The Ni(3)-Ga(13) bond length is 2.59 Å. The Ni(3)-Ga(15) bond length is 2.73 Å. The Ni(3)-Ga(6) bond length is 2.54 Å. Both Ni(3)-Ga(18) bond lengths are 2.51 Å. There is one shorter (2.50 Å) and one longer (2.51 Å) Ni(3)-Ga(9) bond length. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Ni(5), one Ga(10), one Ga(17), one Ga(5), two equivalent Ga(14), and two equivalent Ga(20) atoms. Both Ni(4)-Ni(5) bond lengths are 2.54 Å. The Ni(4)-Ga(10) bond length is 2.43 Å. The Ni(4)-Ga(17) bond length is 2.44 Å. The Ni(4)-Ga(5) bond length is 2.46 Å. Both Ni(4)-Ga(14) bond lengths are 2.52 Å. There is one shorter (2.53 Å) and one longer (2.54 Å) Ni(4)-Ga(20) bond length. In the fifth Ni site, Ni(5) is bonded to two equivalent Ni(4), two equivalent Ni(7), one Ga(11), one Ga(14), one Ga(19), one Ga(20), two equivalent Ga(17), and two equivalent Ga(5) atoms to form distorted face-sharing NiGa8Ni4 cuboctahedra. There is one shorter (2.54 Å) and one longer (2.55 Å) Ni(5)-Ni(7) bond length. The Ni(5)-Ga(11) bond length is 2.45 Å. The Ni(5)-Ga(14) bond length is 2.45 Å. The Ni(5)-Ga(19) bond length is 2.48 Å. The Ni(5)-Ga(20) bond length is 2.49 Å. There is one shorter (2.81 Å) and one longer (2.85 Å) Ni(5)-Ga(17) bond length. There is one shorter (2.84 Å) and one longer (2.86 Å) Ni(5)-Ga(5) bond length. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ga(13), one Ga(19), one Ga(3), two equivalent Ga(1), and two equivalent Ga(16) atoms. The Ni(6)-Ga(13) bond length is 2.51 Å. The Ni(6)-Ga(19) bond length is 2.58 Å. The Ni(6)-Ga(3) bond length is 2.51 Å. Both Ni(6)-Ga(1) bond lengths are 2.59 Å. There is one shorter (2.52 Å) and one longer (2.53 Å) Ni(6)-Ga(16) bond length. In the seventh Ni site, Ni(7) is bonded in a 9-coordinate geometry to two equivalent Ni(5), one Ga(1), one Ga(17), one Ga(5), two equivalent Ga(11), and two equivalent Ga(19) atoms. The Ni(7)-Ga(1) bond length is 2.44 Å. The Ni(7)-Ga(17) bond length is 2.46 Å. The Ni(7)-Ga(5) bond length is 2.45 Å. Both Ni(7)-Ga(11) bond lengths are 2.51 Å. Both Ni(7)-Ga(19) bond lengths are 2.54 Å. In the eighth Ni site, Ni(8) is bonded in a 9-coordinate geometry to two equivalent U(3), one Ga(16), one Ga(20), one Ga(9), two equivalent Ga(10), and two equivalent Ga(13) atoms. The Ni(8)-Ga(16) bond length is 2.50 Å. The Ni(8)-Ga(20) bond length is 2.58 Å. The Ni(8)-Ga(9) bond length is 2.51 Å. Both Ni(8)-Ga(10) bond lengths are 2.61 Å. There is one shorter (2.53 Å) and one longer (2.54 Å) Ni(8)-Ga(13) bond length. In the ninth Ni site, Ni(9) is bonded in a 7-coordinate geometry to two equivalent U(4), one Ga(17), one Ga(18), one Ga(2), two equivalent Ga(6), and two equivalent Ga(8) atoms. The Ni(9)-Ga(17) bond length is 2.42 Å. The Ni(9)-Ga(18) bond length is 2.59 Å. The Ni(9)-Ga(2) bond length is 2.51 Å. Both Ni(9)-Ga(6) bond lengths are 2.46 Å. There is one shorter (2.50 Å) and one longer (2.51 Å) Ni(9)-Ga(8) bond length. In the tenth Ni site, Ni(10) is bonded in a 9-coordinate geometry to two equivalent U(4), one Ga(11), one Ga(18), one Ga(3), two equivalent Ga(1), and two equivalent Ga(12) atoms. The Ni(10)-Ga(11) bond length is 2.53 Å. The Ni(10)-Ga(18) bond length is 2.49 Å. The Ni(10)-Ga(3) bond length is 2.42 Å. There is one shorter (2.60 Å) and one longer (2.61 Å) Ni(10)-Ga(1) bond length. There is one shorter (2.58 Å) and one longer (2.59 Å) Ni(10)-Ga(12) bond length. In the eleventh Ni site, Ni(11) is bonded in a 7-coordinate geometry to two equivalent U(1), one Ga(5), one Ga(7), one Ga(8), two equivalent Ga(2), and two equivalent Ga(4) atoms. The Ni(11)-Ga(5) bond length is 2.44 Å. The Ni(11)-Ga(7) bond length is 2.61 Å. The Ni(11)-Ga(8) bond length is 2.50 Å. Both Ni(11)-Ga(2) bond lengths are 2.50 Å. There is one shorter (2.46 Å) and one longer (2.48 Å) Ni(11)-Ga(4) bond length. There are twenty inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 5-coordinate geometry to one U(2), one U(4), one Ni(7), two equivalent Ni(10), two equivalent Ni(6), one Ga(12), and one Ga(16) atom. The Ga(1)-Ga(12) bond length is 2.86 Å. The Ga(1)-Ga(16) bond length is 2.76 Å. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), two equivalent U(4), one Ni(9), two equivalent Ni(11), one Ga(4), and two equivalent Ga(8) atoms. The Ga(2)-Ga(4) bond length is 2.67 Å. There is one shorter (2.88 Å) and one longer (2.90 Å) Ga(2)-Ga(8) bond length. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one U(3), one Ni(10), one Ni(6), two equivalent Ni(1), one Ga(7), two equivalent Ga(12), and two equivalent Ga(16) atoms. The Ga(3)-Ga(7) bond length is 2.74 Å. Both Ga(3)-Ga(12) bond lengths are 2.74 Å. Both Ga(3)-Ga(16) bond lengths are 2.85 Å. In the fourth Ga site, Ga(4) is bonded in a 8-coordinate geometry to one U(1), two equivalent U(3), one Ni(1), two equivalent Ni(11), one Ga(2), one Ga(20), and two equivalent Ga(7) atoms. The Ga(4)-Ga(20) bond length is 2.77 Å. Both Ga(4)-Ga(7) bond lengths are 2.97 Å. In the fifth Ga site, Ga(5) is bonded in a 3-coordinate geometry to one U(4), one Ni(11), one Ni(4), one Ni(7), and two equivalent Ni(5) atoms. In the sixth Ga site, Ga(6) is bonded in a 8-coordinate geometry to one U(4), two equivalent U(2), one Ni(3), two equivalent Ni(9), one Ga(19), one Ga(8), and two equivalent Ga(18) atoms. The Ga(6)-Ga(19) bond length is 2.77 Å. The Ga(6)-Ga(8) bond length is 2.65 Å. There is one shorter (2.94 Å) and one longer (2.99 Å) Ga(6)-Ga(18) bond length. In the seventh Ga site, Ga(7) is bonded in a 12-coordinate geometry to one U(3), two equivalent U(1), one Ni(11), one Ni(2), two equivalent Ni(1), one Ga(3), two equivalent Ga(15), and two equivalent Ga(4) atoms. There is one shorter (2.92 Å) and one longer (2.95 Å) Ga(7)-Ga(15) bond length. In the eighth Ga site, Ga(8) is bonded in a 10-coordinate geometry to one U(4), two equivalent U(1), one Ni(11), two equivalent Ni(9), one Ga(14), one Ga(6), and two equivalent Ga(2) atoms. The Ga(8)-Ga(14) bond length is 2.73 Å. In the ninth Ga site, Ga(9) is bonded in a 10-coordinate geometry to one U(2), one Ni(2), one Ni(8), two equivalent Ni(3), one Ga(18), two equivalent Ga(13), and two equivalent Ga(15) atoms. The Ga(9)-Ga(18) bond length is 2.78 Å. There is one shorter (2.83 Å) and one longer (2.84 Å) Ga(9)-Ga(13) bond length. There is one shorter (2.73 Å) and one longer (2.74 Å) Ga(9)-Ga(15) bond length. In the tenth Ga site, Ga(10) is bonded in a 5-coordinate geometry to one U(1), one U(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(8), one Ga(13), and one Ga(15) atom. The Ga(10)-Ga(13) bond length is 2.79 Å. The Ga(10)-Ga(15) bond length is 2.85 Å. In the eleventh Ga site, Ga(11) is bonded in a 6-coordinate geometry to two equivalent U(4), one Ni(10), one Ni(5), and two equivalent Ni(7) atoms. In the twelfth Ga site, Ga(12) is bonded in a 11-coordinate geometry to one U(4), one Ni(1), one Ni(3), two equivalent Ni(10), one Ga(1), one Ga(15), two equivalent Ga(18), and two equivalent Ga(3) atoms. The Ga(12)-Ga(15) bond length is 2.62 Å. There is one shorter (2.93 Å) and one longer (2.94 Å) Ga(12)-Ga(18) bond length. In the thirteenth Ga site, Ga(13) is bonded in a 12-coordinate geometry to one U(3), two equivalent U(2), one Ni(3), one Ni(6), two equivalent Ni(8), one Ga(10), two equivalent Ga(16), and two equivalent Ga(9) atoms. Both Ga(13)-Ga(16) bond lengths are 3.03 Å. In the fourteenth Ga site, Ga(14) is bonded in a 6-coordinate geometry to two equivalent U(1), one Ni(2), one Ni(5), two equivalent Ni(4), and one Ga(8) atom. In the fifteenth Ga site, Ga(15) is bonded in a 11-coordinate geometry to one U(1), one Ni(1), one Ni(3), two equivalent Ni(2), one Ga(10), one Ga(12), two equivalent Ga(7), and two equivalent Ga(9) atoms. In the sixteenth Ga site, Ga(16) is bonded in a 12-coordinate geometry to one U(2), two equivalent U(3), one Ni(1), one Ni(8), two equivalent Ni(6), one Ga(1), two equivalent Ga(13), and two equivalent Ga(3) atoms. In the seventeenth Ga site, Ga(17) is bonded in a 3-coordinate geometry to one U(1), one Ni(4), one Ni(7), one Ni(9), and two equivalent Ni(5) atoms. In the eighteenth Ga site, Ga(18) is bonded in a 12-coordinate geometry to one U(2), two equivalent U(4), one Ni(10), one Ni(9), two equivalent Ni(3), one Ga(9), two equivalent Ga(12), and two equivalent Ga(6) atoms. In the nineteenth Ga site, Ga(19) is bonded in a 6-coordinate geometry to two equivalent U(2), one Ni(5), one Ni(6), two equivalent Ni(7), and one Ga(6) atom. In the twentieth Ga site, Ga(20) is bonded in a 6-coordinate geometry to two equivalent U(3), one Ni(5), one Ni(8), two equivalent Ni(4), and one Ga(4) atom.