Sr5Nd3CeCu4PbO18 crystallizes in the orthorhombic Amm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(3), two equivalent O(4), and four equivalent O(6) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(3), two equivalent O(4), and four equivalent O(6) atoms. In the fifth Sr site, Sr(5) is bonded to one O(1), one O(4), two equivalent O(8), and two equivalent O(9) atoms to form SrO6 octahedra that share corners with four equivalent Sr(5)O6 octahedra,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Nd sites. In the first Nd site, Nd(1,2) is bonded in a body-centered cubic geometry to four equivalent O(5) and four equivalent O(7) atoms. In the second Nd site, Nd(3) is bonded in a body-centered cubic geometry to four equivalent O(6) and four equivalent O(7) atoms. Ce(1) is bonded in a body-centered cubic geometry to four equivalent O(6) and four equivalent O(7) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1) and four equivalent O(5) atoms to form CuO5 square pyramids that share  a cornercorner with one Sr(5)O6 octahedra and corners with four equivalent Cu(2)O5 square pyramids. The corner-sharing octahedra are not tilted. In the second Cu site, Cu(2) is bonded to one O(2) and four equivalent O(5) atoms to form CuO5 square pyramids that share  a cornercorner with one Pb(1)O6 octahedra and corners with four equivalent Cu(1)O5 square pyramids. The corner-sharing octahedra are not tilted. In the third Cu site, Cu(3) is bonded to one O(3) and four equivalent O(6) atoms to form CuO5 square pyramids that share  a cornercorner with one Pb(1)O6 octahedra and corners with four equivalent Cu(4)O5 square pyramids. The corner-sharing octahedra are not tilted. In the fourth Cu site, Cu(4) is bonded to one O(4) and four equivalent O(6) atoms to form CuO5 square pyramids that share  a cornercorner with one Sr(5)O6 octahedra and corners with four equivalent Cu(3)O5 square pyramids. The corner-sharing octahedra are not tilted. Pb(1) is bonded to one O(2), one O(3), two equivalent O(8), and two equivalent O(9) atoms to form PbO6 octahedra that share corners with four equivalent Pb(1)O6 octahedra,  a cornercorner with one Cu(2)O5 square pyramid,  a cornercorner with one Cu(3)O5 square pyramid, and edges with four equivalent Sr(5)O6 octahedra. The corner-sharing octahedra are not tilted. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(5), two equivalent Sr(1), two equivalent Sr(2), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra, corners with four equivalent O(1)Sr5Cu octahedra, corners with eight equivalent O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Cu(2), and one Pb(1) atom to form distorted OSr4CuPb octahedra that share  a cornercorner with one O(3)Sr4CuPb octahedra, corners with four equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(1)Sr5Cu octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the third O site, O(3) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Cu(3), and one Pb(1) atom to form distorted OSr4CuPb octahedra that share  a cornercorner with one O(2)Sr4CuPb octahedra, corners with four equivalent O(3)Sr4CuPb octahedra, corners with eight equivalent O(6)Sr2CeNdCu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(4)Sr5Cu octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 0-51°. In the fourth O site, O(4) is bonded to one Sr(5), two equivalent Sr(3), two equivalent Sr(4), and one Cu(4) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Sr5Cu octahedra, corners with four equivalent O(4)Sr5Cu octahedra, corners with eight equivalent O(6)Sr2CeNdCu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(3)Sr4CuPb octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the fifth O site, O(5) is bonded to one Sr(1); one Sr(2); two equivalent Nd(1,2); one Cu(1); and one Cu(2) atom to form distorted OSr2Nd2Cu2 octahedra that share  a cornercorner with one O(8)Sr4Pb2 octahedra,  a cornercorner with one O(9)Sr4Pb2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr4CuPb octahedra, corners with two equivalent O(1)Sr5Cu octahedra, corners with six equivalent O(7)CeNd3 tetrahedra, edges with two equivalent O(5)Sr2Nd2Cu2 octahedra,  an edgeedge with one O(7)CeNd3 tetrahedra,  a faceface with one O(2)Sr4CuPb octahedra,  a faceface with one O(1)Sr5Cu octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-55°. In the sixth O site, O(6) is bonded to one Sr(3), one Sr(4), one Nd(3), one Ce(1), one Cu(3), and one Cu(4) atom to form distorted OSr2CeNdCu2 octahedra that share  a cornercorner with one O(8)Sr4Pb2 octahedra,  a cornercorner with one O(9)Sr4Pb2 octahedra, corners with two equivalent O(6)Sr2CeNdCu2 octahedra, corners with two equivalent O(3)Sr4CuPb octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with six equivalent O(7)CeNd3 tetrahedra, edges with two equivalent O(6)Sr2CeNdCu2 octahedra,  an edgeedge with one O(7)CeNd3 tetrahedra,  a faceface with one O(3)Sr4CuPb octahedra,  a faceface with one O(4)Sr5Cu octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 9-55°. In the seventh O site, O(7) is bonded to one Nd(3); two equivalent Nd(1,2); and one Ce(1) atom to form OCeNd3 tetrahedra that share corners with six equivalent O(6)Sr2CeNdCu2 octahedra, corners with six equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(7)CeNd3 tetrahedra,  an edgeedge with one O(6)Sr2CeNdCu2 octahedra,  an edgeedge with one O(5)Sr2Nd2Cu2 octahedra, and edges with four equivalent O(7)CeNd3 tetrahedra. The corner-sharing octahedral tilt angles range from 7-70°. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), and two equivalent Pb(1) atoms to form OSr4Pb2 octahedra that share corners with four equivalent O(6)Sr2CeNdCu2 octahedra, corners with four equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(2)Sr4CuPb octahedra, edges with two equivalent O(3)Sr4CuPb octahedra, edges with two equivalent O(1)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with four equivalent O(9)Sr4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 0-45°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(4), two equivalent Sr(5), and two equivalent Pb(1) atoms to form OSr4Pb2 octahedra that share corners with four equivalent O(6)Sr2CeNdCu2 octahedra, corners with four equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(9)Sr4Pb2 octahedra, edges with two equivalent O(2)Sr4CuPb octahedra, edges with two equivalent O(3)Sr4CuPb octahedra, edges with two equivalent O(1)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with four equivalent O(8)Sr4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 0-45°.
Sr5Nd3CeCu4PbO18 crystallizes in the orthorhombic Amm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. The Sr(1)-O(9) bond length is 2.67 Å. Both Sr(1)-O(1) bond lengths are 2.76 Å. Both Sr(1)-O(2) bond lengths are 2.79 Å. All Sr(1)-O(5) bond lengths are 2.72 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. The Sr(2)-O(8) bond length is 2.67 Å. Both Sr(2)-O(1) bond lengths are 2.76 Å. Both Sr(2)-O(2) bond lengths are 2.79 Å. All Sr(2)-O(5) bond lengths are 2.72 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(8), two equivalent O(3), two equivalent O(4), and four equivalent O(6) atoms. The Sr(3)-O(8) bond length is 2.67 Å. Both Sr(3)-O(3) bond lengths are 2.79 Å. Both Sr(3)-O(4) bond lengths are 2.76 Å. All Sr(3)-O(6) bond lengths are 2.71 Å. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(3), two equivalent O(4), and four equivalent O(6) atoms. The Sr(4)-O(9) bond length is 2.64 Å. Both Sr(4)-O(3) bond lengths are 2.79 Å. Both Sr(4)-O(4) bond lengths are 2.76 Å. All Sr(4)-O(6) bond lengths are 2.76 Å. In the fifth Sr site, Sr(5) is bonded to one O(1), one O(4), two equivalent O(8), and two equivalent O(9) atoms to form SrO6 octahedra that share corners with four equivalent Sr(5)O6 octahedra,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(4)O5 square pyramid, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedra are not tilted. The Sr(5)-O(1) bond length is 2.33 Å. The Sr(5)-O(4) bond length is 2.33 Å. Both Sr(5)-O(8) bond lengths are 2.74 Å. Both Sr(5)-O(9) bond lengths are 2.74 Å. There are two inequivalent Nd sites. In the first Nd site, Nd(1,2) is bonded in a body-centered cubic geometry to four equivalent O(5) and four equivalent O(7) atoms. All Nd(1,2)-O(5) bond lengths are 2.58 Å. All Nd(1,2)-O(7) bond lengths are 2.36 Å. In the second Nd site, Nd(3) is bonded in a body-centered cubic geometry to four equivalent O(6) and four equivalent O(7) atoms. All Nd(3)-O(6) bond lengths are 2.57 Å. All Nd(3)-O(7) bond lengths are 2.36 Å. Ce(1) is bonded in a body-centered cubic geometry to four equivalent O(6) and four equivalent O(7) atoms. All Ce(1)-O(6) bond lengths are 2.60 Å. All Ce(1)-O(7) bond lengths are 2.24 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1) and four equivalent O(5) atoms to form CuO5 square pyramids that share  a cornercorner with one Sr(5)O6 octahedra and corners with four equivalent Cu(2)O5 square pyramids. The corner-sharing octahedra are not tilted. The Cu(1)-O(1) bond length is 1.99 Å. All Cu(1)-O(5) bond lengths are 1.98 Å. In the second Cu site, Cu(2) is bonded to one O(2) and four equivalent O(5) atoms to form CuO5 square pyramids that share  a cornercorner with one Pb(1)O6 octahedra and corners with four equivalent Cu(1)O5 square pyramids. The corner-sharing octahedra are not tilted. The Cu(2)-O(2) bond length is 2.30 Å. All Cu(2)-O(5) bond lengths are 1.92 Å. In the third Cu site, Cu(3) is bonded to one O(3) and four equivalent O(6) atoms to form CuO5 square pyramids that share  a cornercorner with one Pb(1)O6 octahedra and corners with four equivalent Cu(4)O5 square pyramids. The corner-sharing octahedra are not tilted. The Cu(3)-O(3) bond length is 2.32 Å. All Cu(3)-O(6) bond lengths are 1.92 Å. In the fourth Cu site, Cu(4) is bonded to one O(4) and four equivalent O(6) atoms to form CuO5 square pyramids that share  a cornercorner with one Sr(5)O6 octahedra and corners with four equivalent Cu(3)O5 square pyramids. The corner-sharing octahedra are not tilted. The Cu(4)-O(4) bond length is 2.01 Å. All Cu(4)-O(6) bond lengths are 1.98 Å. Pb(1) is bonded to one O(2), one O(3), two equivalent O(8), and two equivalent O(9) atoms to form PbO6 octahedra that share corners with four equivalent Pb(1)O6 octahedra,  a cornercorner with one Cu(2)O5 square pyramid,  a cornercorner with one Cu(3)O5 square pyramid, and edges with four equivalent Sr(5)O6 octahedra. The corner-sharing octahedra are not tilted. The Pb(1)-O(2) bond length is 2.13 Å. The Pb(1)-O(3) bond length is 2.13 Å. Both Pb(1)-O(8) bond lengths are 2.74 Å. Both Pb(1)-O(9) bond lengths are 2.74 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(5), two equivalent Sr(1), two equivalent Sr(2), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra, corners with four equivalent O(1)Sr5Cu octahedra, corners with eight equivalent O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Cu(2), and one Pb(1) atom to form distorted OSr4CuPb octahedra that share  a cornercorner with one O(3)Sr4CuPb octahedra, corners with four equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(5)Sr2Nd2Cu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(1)Sr5Cu octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the third O site, O(3) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Cu(3), and one Pb(1) atom to form distorted OSr4CuPb octahedra that share  a cornercorner with one O(2)Sr4CuPb octahedra, corners with four equivalent O(3)Sr4CuPb octahedra, corners with eight equivalent O(6)Sr2CeNdCu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(4)Sr5Cu octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 0-51°. In the fourth O site, O(4) is bonded to one Sr(5), two equivalent Sr(3), two equivalent Sr(4), and one Cu(4) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Sr5Cu octahedra, corners with four equivalent O(4)Sr5Cu octahedra, corners with eight equivalent O(6)Sr2CeNdCu2 octahedra, edges with two equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(9)Sr4Pb2 octahedra, edges with four equivalent O(3)Sr4CuPb octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the fifth O site, O(5) is bonded to one Sr(1); one Sr(2); two equivalent Nd(1,2); one Cu(1); and one Cu(2) atom to form distorted OSr2Nd2Cu2 octahedra that share  a cornercorner with one O(8)Sr4Pb2 octahedra,  a cornercorner with one O(9)Sr4Pb2 octahedra, corners with two equivalent O(5)Sr2Nd2Cu2 octahedra, corners with two equivalent O(2)Sr4CuPb octahedra, corners with two equivalent O(1)Sr5Cu octahedra, corners with six equivalent O(7)CeNd3 tetrahedra, edges with two equivalent O(5)Sr2Nd2Cu2 octahedra,  an edgeedge with one O(7)CeNd3 tetrahedra,  a faceface with one O(2)Sr4CuPb octahedra,  a faceface with one O(1)Sr5Cu octahedra, and faces with four equivalent O(5)Sr2Nd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-55°. In the sixth O site, O(6) is bonded to one Sr(3), one Sr(4), one Nd(3), one Ce(1), one Cu(3), and one Cu(4) atom to form distorted OSr2CeNdCu2 octahedra that share  a cornercorner with one O(8)Sr4Pb2 octahedra,  a cornercorner with one O(9)Sr4Pb2 octahedra, corners with two equivalent O(6)Sr2CeNdCu2 octahedra, corners with two equivalent O(3)Sr4CuPb octahedra, corners with two equivalent O(4)Sr5Cu octahedra, corners with six equivalent O(7)CeNd3 tetrahedra, edges with two equivalent O(6)Sr2CeNdCu2 octahedra,  an edgeedge with one O(7)CeNd3 tetrahedra,  a faceface with one O(3)Sr4CuPb octahedra,  a faceface with one O(4)Sr5Cu octahedra, and faces with four equivalent O(6)Sr2CeNdCu2 octahedra. The corner-sharing octahedral tilt angles range from 9-55°. In the seventh O site, O(7) is bonded to one Nd(3); two equivalent Nd(1,2); and one Ce(1) atom to form OCeNd3 tetrahedra that share corners with six equivalent O(6)Sr2CeNdCu2 octahedra, corners with six equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(7)CeNd3 tetrahedra,  an edgeedge with one O(6)Sr2CeNdCu2 octahedra,  an edgeedge with one O(5)Sr2Nd2Cu2 octahedra, and edges with four equivalent O(7)CeNd3 tetrahedra. The corner-sharing octahedral tilt angles range from 7-70°. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), and two equivalent Pb(1) atoms to form OSr4Pb2 octahedra that share corners with four equivalent O(6)Sr2CeNdCu2 octahedra, corners with four equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(8)Sr4Pb2 octahedra, edges with two equivalent O(2)Sr4CuPb octahedra, edges with two equivalent O(3)Sr4CuPb octahedra, edges with two equivalent O(1)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with four equivalent O(9)Sr4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 0-45°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(4), two equivalent Sr(5), and two equivalent Pb(1) atoms to form OSr4Pb2 octahedra that share corners with four equivalent O(6)Sr2CeNdCu2 octahedra, corners with four equivalent O(5)Sr2Nd2Cu2 octahedra, corners with four equivalent O(9)Sr4Pb2 octahedra, edges with two equivalent O(2)Sr4CuPb octahedra, edges with two equivalent O(3)Sr4CuPb octahedra, edges with two equivalent O(1)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with four equivalent O(8)Sr4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 0-45°.