La4Zr8Ni15As16 crystallizes in the monoclinic Pm space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 13-coordinate geometry to one Ni(9), two equivalent Ni(14), two equivalent Ni(3), two equivalent Ni(8), two equivalent As(11), two equivalent As(15), and two equivalent As(7) atoms. In the second La site, La(2) is bonded in a 15-coordinate geometry to one Ni(10), one Ni(13), one Ni(6), two equivalent Ni(15), two equivalent Ni(4), two equivalent Ni(7), two equivalent As(12), two equivalent As(16), and two equivalent As(8) atoms. In the third La site, La(3) is bonded in a 14-coordinate geometry to one Ni(11), one Ni(14), one Ni(7), two equivalent Ni(1), two equivalent Ni(6), one As(11), two equivalent As(13), two equivalent As(5), and two equivalent As(9) atoms. In the fourth La site, La(4) is bonded in a 15-coordinate geometry to one Ni(12), one Ni(15), one Ni(8), two equivalent Ni(13), two equivalent Ni(2), two equivalent Ni(5), two equivalent As(10), two equivalent As(14), and two equivalent As(6) atoms. There are eight inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a 6-coordinate geometry to one Ni(1), two equivalent Ni(11), one As(13), one As(5), two equivalent As(3), and two equivalent As(8) atoms. In the second Zr site, Zr(2) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Ni(12), one As(14), one As(6), two equivalent As(4), and two equivalent As(7) atoms. In the third Zr site, Zr(3) is bonded in a 6-coordinate geometry to one Ni(3), two equivalent Ni(9), one As(15), one As(7), two equivalent As(1), and two equivalent As(6) atoms. In the fourth Zr site, Zr(4) is bonded in a 6-coordinate geometry to one Ni(4), two equivalent Ni(10), one As(16), one As(8), two equivalent As(2), and two equivalent As(5) atoms. In the fifth Zr site, Zr(5) is bonded in a 10-coordinate geometry to one Ni(1), two equivalent Ni(11), two equivalent Ni(3), one As(1), two equivalent As(11), and two equivalent As(3) atoms. In the sixth Zr site, Zr(6) is bonded in a 11-coordinate geometry to one Ni(13), one Ni(2), two equivalent Ni(12), two equivalent Ni(4), one As(2), two equivalent As(12), and two equivalent As(4) atoms. In the seventh Zr site, Zr(7) is bonded in a 11-coordinate geometry to one Ni(14), one Ni(3), two equivalent Ni(1), two equivalent Ni(9), one As(3), two equivalent As(1), and two equivalent As(9) atoms. In the eighth Zr site, Zr(8) is bonded in a 11-coordinate geometry to one Ni(15), one Ni(4), two equivalent Ni(10), two equivalent Ni(2), one As(4), two equivalent As(10), and two equivalent As(2) atoms. There are fifteen inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent La(3), one Zr(1), one Zr(5), two equivalent Zr(7), one As(5), one As(9), and two equivalent As(3) atoms. In the second Ni site, Ni(2) is bonded in a 10-coordinate geometry to two equivalent La(4), one Zr(2), one Zr(6), two equivalent Zr(8), one As(10), one As(6), and two equivalent As(4) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent La(1), one Zr(3), one Zr(7), two equivalent Zr(5), one As(11), one As(7), and two equivalent As(1) atoms. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to two equivalent La(2), one Zr(4), one Zr(8), two equivalent Zr(6), one As(12), one As(8), and two equivalent As(2) atoms. In the fifth Ni site, Ni(5) is bonded to two equivalent La(4), one Ni(9), one As(14), one As(6), and two equivalent As(15) atoms to form distorted NiLa2NiAs4 tetrahedra that share edges with two equivalent Ni(5)La2NiAs4 tetrahedra and faces with two equivalent Ni(8)La3NiAs4 tetrahedra. In the sixth Ni site, Ni(6) is bonded to one La(2), two equivalent La(3), one Ni(10), one As(13), one As(5), and two equivalent As(16) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids,  an edgeedge with one As(5)La2Zr3Ni2 pentagonal bipyramid, edges with two equivalent Ni(6)La3NiAs4 tetrahedra, and faces with two equivalent Ni(7)La3NiAs4 tetrahedra. In the seventh Ni site, Ni(7) is bonded to one La(3), two equivalent La(2), one Ni(11), one As(16), one As(8), and two equivalent As(13) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids, edges with two equivalent Ni(7)La3NiAs4 tetrahedra, and faces with two equivalent Ni(6)La3NiAs4 tetrahedra. In the eighth Ni site, Ni(8) is bonded to one La(4), two equivalent La(1), one Ni(12), one As(15), one As(7), and two equivalent As(14) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(7)La2Zr3Ni2 pentagonal bipyramids,  an edgeedge with one As(7)La2Zr3Ni2 pentagonal bipyramid, edges with two equivalent Ni(8)La3NiAs4 tetrahedra, and faces with two equivalent Ni(5)La2NiAs4 tetrahedra. In the ninth Ni site, Ni(9) is bonded in a 12-coordinate geometry to one La(1), two equivalent Zr(3), two equivalent Zr(7), one Ni(5), two equivalent Ni(14), one As(1), one As(9), and two equivalent As(15) atoms. In the tenth Ni site, Ni(10) is bonded in a 12-coordinate geometry to one La(2), two equivalent Zr(4), two equivalent Zr(8), one Ni(6), two equivalent Ni(15), one As(10), one As(2), and two equivalent As(16) atoms. In the eleventh Ni site, Ni(11) is bonded in a 10-coordinate geometry to one La(3), two equivalent Zr(1), two equivalent Zr(5), one Ni(7), one As(11), one As(3), and two equivalent As(13) atoms. In the twelfth Ni site, Ni(12) is bonded in a 12-coordinate geometry to one La(4), two equivalent Zr(2), two equivalent Zr(6), one Ni(8), two equivalent Ni(13), one As(12), one As(4), and two equivalent As(14) atoms. In the thirteenth Ni site, Ni(13) is bonded in a 7-coordinate geometry to one La(2), two equivalent La(4), one Zr(6), two equivalent Ni(12), one As(10), one As(14), and two equivalent As(12) atoms. In the fourteenth Ni site, Ni(14) is bonded in a 7-coordinate geometry to one La(3), two equivalent La(1), one Zr(7), two equivalent Ni(9), one As(11), one As(15), and two equivalent As(9) atoms. In the fifteenth Ni site, Ni(15) is bonded in a 7-coordinate geometry to one La(4), two equivalent La(2), one Zr(8), two equivalent Ni(10), one As(12), one As(16), and two equivalent As(10) atoms. There are sixteen inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to one Zr(5), two equivalent Zr(3), two equivalent Zr(7), one Ni(9), and two equivalent Ni(3) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to one Zr(6), two equivalent Zr(4), two equivalent Zr(8), one Ni(10), and two equivalent Ni(4) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to one Zr(7), two equivalent Zr(1), two equivalent Zr(5), one Ni(11), and two equivalent Ni(1) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to one Zr(8), two equivalent Zr(2), two equivalent Zr(6), one Ni(12), and two equivalent Ni(2) atoms. In the fifth As site, As(5) is bonded to two equivalent La(3), one Zr(1), two equivalent Zr(4), one Ni(1), and one Ni(6) atom to form distorted AsLa2Zr3Ni2 pentagonal bipyramids that share corners with two equivalent Ni(6)La3NiAs4 tetrahedra, corners with two equivalent Ni(7)La3NiAs4 tetrahedra, edges with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids, and  an edgeedge with one Ni(6)La3NiAs4 tetrahedra. In the sixth As site, As(6) is bonded in a 7-coordinate geometry to two equivalent La(4), one Zr(2), two equivalent Zr(3), one Ni(2), and one Ni(5) atom. In the seventh As site, As(7) is bonded to two equivalent La(1), one Zr(3), two equivalent Zr(2), one Ni(3), and one Ni(8) atom to form distorted AsLa2Zr3Ni2 pentagonal bipyramids that share corners with two equivalent Ni(8)La3NiAs4 tetrahedra, edges with two equivalent As(7)La2Zr3Ni2 pentagonal bipyramids, and  an edgeedge with one Ni(8)La3NiAs4 tetrahedra. In the eighth As site, As(8) is bonded in a 7-coordinate geometry to two equivalent La(2), one Zr(4), two equivalent Zr(1), one Ni(4), and one Ni(7) atom. In the ninth As site, As(9) is bonded in a 8-coordinate geometry to two equivalent La(3), two equivalent Zr(7), one Ni(1), one Ni(9), and two equivalent Ni(14) atoms. In the tenth As site, As(10) is bonded in a 9-coordinate geometry to two equivalent La(4), two equivalent Zr(8), one Ni(10), one Ni(13), one Ni(2), and two equivalent Ni(15) atoms. In the eleventh As site, As(11) is bonded in a 8-coordinate geometry to one La(3), two equivalent La(1), two equivalent Zr(5), one Ni(11), one Ni(14), and one Ni(3) atom. In the twelfth As site, As(12) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent Zr(6), one Ni(12), one Ni(15), one Ni(4), and two equivalent Ni(13) atoms. In the thirteenth As site, As(13) is bonded in a 8-coordinate geometry to two equivalent La(3), one Zr(1), one Ni(6), two equivalent Ni(11), and two equivalent Ni(7) atoms. In the fourteenth As site, As(14) is bonded in a 9-coordinate geometry to two equivalent La(4), one Zr(2), one Ni(13), one Ni(5), two equivalent Ni(12), and two equivalent Ni(8) atoms. In the fifteenth As site, As(15) is bonded in a 9-coordinate geometry to two equivalent La(1), one Zr(3), one Ni(14), one Ni(8), two equivalent Ni(5), and two equivalent Ni(9) atoms. In the sixteenth As site, As(16) is bonded in a 9-coordinate geometry to two equivalent La(2), one Zr(4), one Ni(15), one Ni(7), two equivalent Ni(10), and two equivalent Ni(6) atoms.
La4Zr8Ni15As16 crystallizes in the monoclinic Pm space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 13-coordinate geometry to one Ni(9), two equivalent Ni(14), two equivalent Ni(3), two equivalent Ni(8), two equivalent As(11), two equivalent As(15), and two equivalent As(7) atoms. The La(1)-Ni(9) bond length is 3.22 Å. Both La(1)-Ni(14) bond lengths are 3.04 Å. Both La(1)-Ni(3) bond lengths are 3.22 Å. Both La(1)-Ni(8) bond lengths are 3.35 Å. Both La(1)-As(11) bond lengths are 3.10 Å. Both La(1)-As(15) bond lengths are 3.12 Å. Both La(1)-As(7) bond lengths are 3.03 Å. In the second La site, La(2) is bonded in a 15-coordinate geometry to one Ni(10), one Ni(13), one Ni(6), two equivalent Ni(15), two equivalent Ni(4), two equivalent Ni(7), two equivalent As(12), two equivalent As(16), and two equivalent As(8) atoms. The La(2)-Ni(10) bond length is 3.23 Å. The La(2)-Ni(13) bond length is 3.40 Å. The La(2)-Ni(6) bond length is 3.41 Å. Both La(2)-Ni(15) bond lengths are 3.05 Å. Both La(2)-Ni(4) bond lengths are 3.23 Å. Both La(2)-Ni(7) bond lengths are 3.29 Å. Both La(2)-As(12) bond lengths are 3.11 Å. Both La(2)-As(16) bond lengths are 3.11 Å. Both La(2)-As(8) bond lengths are 3.02 Å. In the third La site, La(3) is bonded in a 14-coordinate geometry to one Ni(11), one Ni(14), one Ni(7), two equivalent Ni(1), two equivalent Ni(6), one As(11), two equivalent As(13), two equivalent As(5), and two equivalent As(9) atoms. The La(3)-Ni(11) bond length is 3.13 Å. The La(3)-Ni(14) bond length is 3.30 Å. The La(3)-Ni(7) bond length is 3.42 Å. Both La(3)-Ni(1) bond lengths are 3.32 Å. Both La(3)-Ni(6) bond lengths are 3.37 Å. The La(3)-As(11) bond length is 3.47 Å. Both La(3)-As(13) bond lengths are 3.07 Å. Both La(3)-As(5) bond lengths are 3.08 Å. Both La(3)-As(9) bond lengths are 3.06 Å. In the fourth La site, La(4) is bonded in a 15-coordinate geometry to one Ni(12), one Ni(15), one Ni(8), two equivalent Ni(13), two equivalent Ni(2), two equivalent Ni(5), two equivalent As(10), two equivalent As(14), and two equivalent As(6) atoms. The La(4)-Ni(12) bond length is 3.23 Å. The La(4)-Ni(15) bond length is 3.40 Å. The La(4)-Ni(8) bond length is 3.43 Å. Both La(4)-Ni(13) bond lengths are 3.05 Å. Both La(4)-Ni(2) bond lengths are 3.23 Å. Both La(4)-Ni(5) bond lengths are 3.31 Å. Both La(4)-As(10) bond lengths are 3.11 Å. Both La(4)-As(14) bond lengths are 3.11 Å. Both La(4)-As(6) bond lengths are 3.02 Å. There are eight inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a 6-coordinate geometry to one Ni(1), two equivalent Ni(11), one As(13), one As(5), two equivalent As(3), and two equivalent As(8) atoms. The Zr(1)-Ni(1) bond length is 2.89 Å. Both Zr(1)-Ni(11) bond lengths are 3.10 Å. The Zr(1)-As(13) bond length is 2.76 Å. The Zr(1)-As(5) bond length is 2.85 Å. Both Zr(1)-As(3) bond lengths are 2.82 Å. Both Zr(1)-As(8) bond lengths are 2.72 Å. In the second Zr site, Zr(2) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Ni(12), one As(14), one As(6), two equivalent As(4), and two equivalent As(7) atoms. The Zr(2)-Ni(2) bond length is 2.90 Å. Both Zr(2)-Ni(12) bond lengths are 3.12 Å. The Zr(2)-As(14) bond length is 2.76 Å. The Zr(2)-As(6) bond length is 2.82 Å. Both Zr(2)-As(4) bond lengths are 2.82 Å. Both Zr(2)-As(7) bond lengths are 2.72 Å. In the third Zr site, Zr(3) is bonded in a 6-coordinate geometry to one Ni(3), two equivalent Ni(9), one As(15), one As(7), two equivalent As(1), and two equivalent As(6) atoms. The Zr(3)-Ni(3) bond length is 2.89 Å. Both Zr(3)-Ni(9) bond lengths are 3.12 Å. The Zr(3)-As(15) bond length is 2.76 Å. The Zr(3)-As(7) bond length is 2.83 Å. Both Zr(3)-As(1) bond lengths are 2.83 Å. Both Zr(3)-As(6) bond lengths are 2.72 Å. In the fourth Zr site, Zr(4) is bonded in a 6-coordinate geometry to one Ni(4), two equivalent Ni(10), one As(16), one As(8), two equivalent As(2), and two equivalent As(5) atoms. The Zr(4)-Ni(4) bond length is 2.92 Å. Both Zr(4)-Ni(10) bond lengths are 3.14 Å. The Zr(4)-As(16) bond length is 2.76 Å. The Zr(4)-As(8) bond length is 2.82 Å. Both Zr(4)-As(2) bond lengths are 2.84 Å. Both Zr(4)-As(5) bond lengths are 2.73 Å. In the fifth Zr site, Zr(5) is bonded in a 10-coordinate geometry to one Ni(1), two equivalent Ni(11), two equivalent Ni(3), one As(1), two equivalent As(11), and two equivalent As(3) atoms. The Zr(5)-Ni(1) bond length is 2.96 Å. Both Zr(5)-Ni(11) bond lengths are 2.84 Å. Both Zr(5)-Ni(3) bond lengths are 2.99 Å. The Zr(5)-As(1) bond length is 2.78 Å. Both Zr(5)-As(11) bond lengths are 2.74 Å. Both Zr(5)-As(3) bond lengths are 2.83 Å. In the sixth Zr site, Zr(6) is bonded in a 11-coordinate geometry to one Ni(13), one Ni(2), two equivalent Ni(12), two equivalent Ni(4), one As(2), two equivalent As(12), and two equivalent As(4) atoms. The Zr(6)-Ni(13) bond length is 2.73 Å. The Zr(6)-Ni(2) bond length is 2.91 Å. Both Zr(6)-Ni(12) bond lengths are 2.89 Å. Both Zr(6)-Ni(4) bond lengths are 2.98 Å. The Zr(6)-As(2) bond length is 2.74 Å. Both Zr(6)-As(12) bond lengths are 2.80 Å. Both Zr(6)-As(4) bond lengths are 2.80 Å. In the seventh Zr site, Zr(7) is bonded in a 11-coordinate geometry to one Ni(14), one Ni(3), two equivalent Ni(1), two equivalent Ni(9), one As(3), two equivalent As(1), and two equivalent As(9) atoms. The Zr(7)-Ni(14) bond length is 2.73 Å. The Zr(7)-Ni(3) bond length is 2.91 Å. Both Zr(7)-Ni(1) bond lengths are 2.95 Å. Both Zr(7)-Ni(9) bond lengths are 2.90 Å. The Zr(7)-As(3) bond length is 2.71 Å. Both Zr(7)-As(1) bond lengths are 2.79 Å. Both Zr(7)-As(9) bond lengths are 2.82 Å. In the eighth Zr site, Zr(8) is bonded in a 11-coordinate geometry to one Ni(15), one Ni(4), two equivalent Ni(10), two equivalent Ni(2), one As(4), two equivalent As(10), and two equivalent As(2) atoms. The Zr(8)-Ni(15) bond length is 2.73 Å. The Zr(8)-Ni(4) bond length is 2.91 Å. Both Zr(8)-Ni(10) bond lengths are 2.88 Å. Both Zr(8)-Ni(2) bond lengths are 2.98 Å. The Zr(8)-As(4) bond length is 2.74 Å. Both Zr(8)-As(10) bond lengths are 2.80 Å. Both Zr(8)-As(2) bond lengths are 2.80 Å. There are fifteen inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent La(3), one Zr(1), one Zr(5), two equivalent Zr(7), one As(5), one As(9), and two equivalent As(3) atoms. The Ni(1)-As(5) bond length is 2.42 Å. The Ni(1)-As(9) bond length is 2.44 Å. Both Ni(1)-As(3) bond lengths are 2.39 Å. In the second Ni site, Ni(2) is bonded in a 10-coordinate geometry to two equivalent La(4), one Zr(2), one Zr(6), two equivalent Zr(8), one As(10), one As(6), and two equivalent As(4) atoms. The Ni(2)-As(10) bond length is 2.42 Å. The Ni(2)-As(6) bond length is 2.43 Å. Both Ni(2)-As(4) bond lengths are 2.40 Å. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent La(1), one Zr(3), one Zr(7), two equivalent Zr(5), one As(11), one As(7), and two equivalent As(1) atoms. The Ni(3)-As(11) bond length is 2.47 Å. The Ni(3)-As(7) bond length is 2.42 Å. Both Ni(3)-As(1) bond lengths are 2.39 Å. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to two equivalent La(2), one Zr(4), one Zr(8), two equivalent Zr(6), one As(12), one As(8), and two equivalent As(2) atoms. The Ni(4)-As(12) bond length is 2.42 Å. The Ni(4)-As(8) bond length is 2.43 Å. Both Ni(4)-As(2) bond lengths are 2.40 Å. In the fifth Ni site, Ni(5) is bonded to two equivalent La(4), one Ni(9), one As(14), one As(6), and two equivalent As(15) atoms to form distorted NiLa2NiAs4 tetrahedra that share edges with two equivalent Ni(5)La2NiAs4 tetrahedra and faces with two equivalent Ni(8)La3NiAs4 tetrahedra. The Ni(5)-Ni(9) bond length is 2.58 Å. The Ni(5)-As(14) bond length is 2.44 Å. The Ni(5)-As(6) bond length is 2.44 Å. Both Ni(5)-As(15) bond lengths are 2.46 Å. In the sixth Ni site, Ni(6) is bonded to one La(2), two equivalent La(3), one Ni(10), one As(13), one As(5), and two equivalent As(16) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids,  an edgeedge with one As(5)La2Zr3Ni2 pentagonal bipyramid, edges with two equivalent Ni(6)La3NiAs4 tetrahedra, and faces with two equivalent Ni(7)La3NiAs4 tetrahedra. The Ni(6)-Ni(10) bond length is 2.56 Å. The Ni(6)-As(13) bond length is 2.48 Å. The Ni(6)-As(5) bond length is 2.43 Å. Both Ni(6)-As(16) bond lengths are 2.45 Å. In the seventh Ni site, Ni(7) is bonded to one La(3), two equivalent La(2), one Ni(11), one As(16), one As(8), and two equivalent As(13) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids, edges with two equivalent Ni(7)La3NiAs4 tetrahedra, and faces with two equivalent Ni(6)La3NiAs4 tetrahedra. The Ni(7)-Ni(11) bond length is 2.55 Å. The Ni(7)-As(16) bond length is 2.45 Å. The Ni(7)-As(8) bond length is 2.43 Å. Both Ni(7)-As(13) bond lengths are 2.47 Å. In the eighth Ni site, Ni(8) is bonded to one La(4), two equivalent La(1), one Ni(12), one As(15), one As(7), and two equivalent As(14) atoms to form distorted NiLa3NiAs4 tetrahedra that share corners with two equivalent As(7)La2Zr3Ni2 pentagonal bipyramids,  an edgeedge with one As(7)La2Zr3Ni2 pentagonal bipyramid, edges with two equivalent Ni(8)La3NiAs4 tetrahedra, and faces with two equivalent Ni(5)La2NiAs4 tetrahedra. The Ni(8)-Ni(12) bond length is 2.57 Å. The Ni(8)-As(15) bond length is 2.45 Å. The Ni(8)-As(7) bond length is 2.44 Å. Both Ni(8)-As(14) bond lengths are 2.46 Å. In the ninth Ni site, Ni(9) is bonded in a 12-coordinate geometry to one La(1), two equivalent Zr(3), two equivalent Zr(7), one Ni(5), two equivalent Ni(14), one As(1), one As(9), and two equivalent As(15) atoms. Both Ni(9)-Ni(14) bond lengths are 2.81 Å. The Ni(9)-As(1) bond length is 2.46 Å. The Ni(9)-As(9) bond length is 2.48 Å. Both Ni(9)-As(15) bond lengths are 2.46 Å. In the tenth Ni site, Ni(10) is bonded in a 12-coordinate geometry to one La(2), two equivalent Zr(4), two equivalent Zr(8), one Ni(6), two equivalent Ni(15), one As(10), one As(2), and two equivalent As(16) atoms. Both Ni(10)-Ni(15) bond lengths are 2.82 Å. The Ni(10)-As(10) bond length is 2.47 Å. The Ni(10)-As(2) bond length is 2.43 Å. Both Ni(10)-As(16) bond lengths are 2.46 Å. In the eleventh Ni site, Ni(11) is bonded in a 10-coordinate geometry to one La(3), two equivalent Zr(1), two equivalent Zr(5), one Ni(7), one As(11), one As(3), and two equivalent As(13) atoms. The Ni(11)-As(11) bond length is 2.47 Å. The Ni(11)-As(3) bond length is 2.41 Å. Both Ni(11)-As(13) bond lengths are 2.45 Å. In the twelfth Ni site, Ni(12) is bonded in a 12-coordinate geometry to one La(4), two equivalent Zr(2), two equivalent Zr(6), one Ni(8), two equivalent Ni(13), one As(12), one As(4), and two equivalent As(14) atoms. Both Ni(12)-Ni(13) bond lengths are 2.82 Å. The Ni(12)-As(12) bond length is 2.48 Å. The Ni(12)-As(4) bond length is 2.44 Å. Both Ni(12)-As(14) bond lengths are 2.46 Å. In the thirteenth Ni site, Ni(13) is bonded in a 7-coordinate geometry to one La(2), two equivalent La(4), one Zr(6), two equivalent Ni(12), one As(10), one As(14), and two equivalent As(12) atoms. The Ni(13)-As(10) bond length is 2.41 Å. The Ni(13)-As(14) bond length is 2.46 Å. Both Ni(13)-As(12) bond lengths are 2.40 Å. In the fourteenth Ni site, Ni(14) is bonded in a 7-coordinate geometry to one La(3), two equivalent La(1), one Zr(7), two equivalent Ni(9), one As(11), one As(15), and two equivalent As(9) atoms. The Ni(14)-As(11) bond length is 2.42 Å. The Ni(14)-As(15) bond length is 2.46 Å. Both Ni(14)-As(9) bond lengths are 2.39 Å. In the fifteenth Ni site, Ni(15) is bonded in a 7-coordinate geometry to one La(4), two equivalent La(2), one Zr(8), two equivalent Ni(10), one As(12), one As(16), and two equivalent As(10) atoms. The Ni(15)-As(12) bond length is 2.41 Å. The Ni(15)-As(16) bond length is 2.45 Å. Both Ni(15)-As(10) bond lengths are 2.40 Å. There are sixteen inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to one Zr(5), two equivalent Zr(3), two equivalent Zr(7), one Ni(9), and two equivalent Ni(3) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to one Zr(6), two equivalent Zr(4), two equivalent Zr(8), one Ni(10), and two equivalent Ni(4) atoms. In the third As site, As(3) is bonded in a 8-coordinate geometry to one Zr(7), two equivalent Zr(1), two equivalent Zr(5), one Ni(11), and two equivalent Ni(1) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to one Zr(8), two equivalent Zr(2), two equivalent Zr(6), one Ni(12), and two equivalent Ni(2) atoms. In the fifth As site, As(5) is bonded to two equivalent La(3), one Zr(1), two equivalent Zr(4), one Ni(1), and one Ni(6) atom to form distorted AsLa2Zr3Ni2 pentagonal bipyramids that share corners with two equivalent Ni(6)La3NiAs4 tetrahedra, corners with two equivalent Ni(7)La3NiAs4 tetrahedra, edges with two equivalent As(5)La2Zr3Ni2 pentagonal bipyramids, and  an edgeedge with one Ni(6)La3NiAs4 tetrahedra. In the sixth As site, As(6) is bonded in a 7-coordinate geometry to two equivalent La(4), one Zr(2), two equivalent Zr(3), one Ni(2), and one Ni(5) atom. In the seventh As site, As(7) is bonded to two equivalent La(1), one Zr(3), two equivalent Zr(2), one Ni(3), and one Ni(8) atom to form distorted AsLa2Zr3Ni2 pentagonal bipyramids that share corners with two equivalent Ni(8)La3NiAs4 tetrahedra, edges with two equivalent As(7)La2Zr3Ni2 pentagonal bipyramids, and  an edgeedge with one Ni(8)La3NiAs4 tetrahedra. In the eighth As site, As(8) is bonded in a 7-coordinate geometry to two equivalent La(2), one Zr(4), two equivalent Zr(1), one Ni(4), and one Ni(7) atom. In the ninth As site, As(9) is bonded in a 8-coordinate geometry to two equivalent La(3), two equivalent Zr(7), one Ni(1), one Ni(9), and two equivalent Ni(14) atoms. In the tenth As site, As(10) is bonded in a 9-coordinate geometry to two equivalent La(4), two equivalent Zr(8), one Ni(10), one Ni(13), one Ni(2), and two equivalent Ni(15) atoms. In the eleventh As site, As(11) is bonded in a 8-coordinate geometry to one La(3), two equivalent La(1), two equivalent Zr(5), one Ni(11), one Ni(14), and one Ni(3) atom. In the twelfth As site, As(12) is bonded in a 9-coordinate geometry to two equivalent La(2), two equivalent Zr(6), one Ni(12), one Ni(15), one Ni(4), and two equivalent Ni(13) atoms. In the thirteenth As site, As(13) is bonded in a 8-coordinate geometry to two equivalent La(3), one Zr(1), one Ni(6), two equivalent Ni(11), and two equivalent Ni(7) atoms. In the fourteenth As site, As(14) is bonded in a 9-coordinate geometry to two equivalent La(4), one Zr(2), one Ni(13), one Ni(5), two equivalent Ni(12), and two equivalent Ni(8) atoms. In the fifteenth As site, As(15) is bonded in a 9-coordinate geometry to two equivalent La(1), one Zr(3), one Ni(14), one Ni(8), two equivalent Ni(5), and two equivalent Ni(9) atoms. In the sixteenth As site, As(16) is bonded in a 9-coordinate geometry to two equivalent La(2), one Zr(4), one Ni(15), one Ni(7), two equivalent Ni(10), and two equivalent Ni(6) atoms.