Sr2YCu2PbO7 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(2) atoms. Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. Cu(1) is bonded to one O(2) and four equivalent O(1) 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. Pb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form PbO6 octahedra that share corners with four equivalent Pb(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form distorted OSr2Y2Cu2 octahedra that share corners with two equivalent O(3)Sr2Pb4 octahedra, corners with four equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with three equivalent O(1)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(1)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the second O site, O(2) is bonded to four equivalent Sr(1), one Cu(1), and one Pb(1) atom to form OSr4CuPb octahedra that share corners with five equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with four equivalent O(3)Sr2Pb4 octahedra, edges with four equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(1)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the third O site, O(3) is bonded to two equivalent Sr(1) and four equivalent Pb(1) atoms to form OSr2Pb4 octahedra that share corners with four equivalent O(3)Sr2Pb4 octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with four equivalent O(3)Sr2Pb4 octahedra, and edges with eight equivalent O(2)Sr4CuPb octahedra. The corner-sharing octahedral tilt angles range from 0-43°.
Sr2YCu2PbO7 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(2) atoms. The Sr(1)-O(3) bond length is 2.62 Å. All Sr(1)-O(1) bond lengths are 2.81 Å. All Sr(1)-O(2) bond lengths are 2.72 Å. Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Y(1)-O(1) bond lengths are 2.41 Å. Cu(1) is bonded to one O(2) and four equivalent O(1) 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(1)-O(2) bond length is 2.16 Å. All Cu(1)-O(1) bond lengths are 1.93 Å. Pb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form PbO6 octahedra that share corners with four equivalent Pb(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and edges with four equivalent Pb(1)O6 octahedra. The corner-sharing octahedra are not tilted. Both Pb(1)-O(2) bond lengths are 2.28 Å. All Pb(1)-O(3) bond lengths are 2.70 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form distorted OSr2Y2Cu2 octahedra that share corners with two equivalent O(3)Sr2Pb4 octahedra, corners with four equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with three equivalent O(1)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(1)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the second O site, O(2) is bonded to four equivalent Sr(1), one Cu(1), and one Pb(1) atom to form OSr4CuPb octahedra that share corners with five equivalent O(2)Sr4CuPb octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with four equivalent O(3)Sr2Pb4 octahedra, edges with four equivalent O(2)Sr4CuPb octahedra, and faces with four equivalent O(1)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the third O site, O(3) is bonded to two equivalent Sr(1) and four equivalent Pb(1) atoms to form OSr2Pb4 octahedra that share corners with four equivalent O(3)Sr2Pb4 octahedra, corners with eight equivalent O(1)Sr2Y2Cu2 octahedra, edges with four equivalent O(3)Sr2Pb4 octahedra, and edges with eight equivalent O(2)Sr4CuPb octahedra. The corner-sharing octahedral tilt angles range from 0-43°.