Sr6Ce2Y4Fe3(CuO8)3 crystallizes in the monoclinic Cm space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), two equivalent O(10), and two equivalent O(12) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(10), two equivalent O(11), and two equivalent O(2) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(11), two equivalent O(12), and two equivalent O(3) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(13), two equivalent O(14), and two equivalent O(4) atoms. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(2), one O(4), one O(6), two equivalent O(14), two equivalent O(15), and two equivalent O(5) atoms. In the sixth Sr site, Sr(6) is bonded in a 9-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(13), two equivalent O(15), and two equivalent O(6) atoms. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(14), two equivalent O(15), two equivalent O(7), and two equivalent O(9) atoms. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(13), two equivalent O(14), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(11), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms. In the third Y site, Y(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(7), and two equivalent O(9) atoms. In the fourth Y site, Y(4) is bonded in a body-centered cubic geometry to two equivalent O(13), two equivalent O(15), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(11) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Fe(2)O5 trigonal bipyramids. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(10), and two equivalent O(12) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Fe(1)O5 trigonal bipyramids. In the third Fe site, Fe(3) is bonded to one O(6), two equivalent O(13), and two equivalent O(15) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(2)O5 square pyramids and corners with two equivalent Cu(3)O5 square pyramids. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(3), two equivalent O(11), and two equivalent O(12) atoms to form CuO5 square pyramids that share corners with two equivalent Fe(1)O5 trigonal bipyramids and corners with two equivalent Fe(2)O5 trigonal bipyramids. In the second Cu site, Cu(2) is bonded to one O(5), two equivalent O(14), and two equivalent O(15) atoms to form CuO5 square pyramids that share corners with two equivalent Cu(3)O5 square pyramids and corners with two equivalent Fe(3)O5 trigonal bipyramids. In the third Cu site, Cu(3) is bonded to one O(4), two equivalent O(13), and two equivalent O(14) atoms to form CuO5 square pyramids that share corners with two equivalent Cu(2)O5 square pyramids and corners with two equivalent Fe(3)O5 trigonal bipyramids. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Sr(4), two equivalent Sr(1), and one Fe(2) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(3)Sr5Cu octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(1)Sr5Fe octahedra,  an edgeedge with one O(5)Sr5Cu octahedra,  an edgeedge with one O(6)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with two equivalent O(2)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the second O site, O(2) is bonded to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(2), and one Fe(1) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(3)Sr5Cu octahedra,  a cornercorner with one O(1)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(2)Sr5Fe octahedra,  an edgeedge with one O(4)Sr5Cu octahedra,  an edgeedge with one O(6)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(5)Sr5Cu octahedra, and edges with two equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(6), two equivalent Sr(3), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Sr5Fe octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(3)Sr5Cu octahedra,  an edgeedge with one O(4)Sr5Cu octahedra,  an edgeedge with one O(5)Sr5Cu octahedra, edges with two equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(2)Sr5Fe octahedra, and edges with two equivalent O(6)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-13°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(5), one Sr(6), two equivalent Sr(4), and one Cu(3) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(5)Sr5Cu octahedra,  a cornercorner with one O(6)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra,  an edgeedge with one O(3)Sr5Cu octahedra,  an edgeedge with one O(2)Sr5Fe octahedra, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(6)Sr5Fe octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-53°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(4), one Sr(6), two equivalent Sr(5), and one Cu(2) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(6)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(5)Sr5Cu octahedra,  an edgeedge with one O(3)Sr5Cu octahedra,  an edgeedge with one O(1)Sr5Fe octahedra, edges with two equivalent O(4)Sr5Cu octahedra, edges with two equivalent O(2)Sr5Fe octahedra, edges with two equivalent O(6)Sr5Fe octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-53°. In the sixth O site, O(6) is bonded to one Sr(3), one Sr(4), one Sr(5), two equivalent Sr(6), and one Fe(3) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(5)Sr5Cu octahedra, corners with two equivalent O(6)Sr5Fe octahedra, corners with four equivalent O(14)Sr2Ce2Cu2 octahedra,  an edgeedge with one O(1)Sr5Fe octahedra,  an edgeedge with one O(2)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with two equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 10-59°. In the seventh O site, O(7) is bonded to one Ce(1), one Y(2), one Y(3), and one Y(4) atom to form OCeY3 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  an edgeedge with one O(8)CeY3 tetrahedra, and edges with two equivalent O(7)CeY3 tetrahedra. The corner-sharing octahedral tilt angles range from 7-70°. In the eighth O site, O(8) is bonded to one Ce(2), one Y(1), one Y(2), and one Y(4) atom to form OCeY3 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(7)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  an edgeedge with one O(7)CeY3 tetrahedra, and edges with two equivalent O(8)CeY3 tetrahedra. The corner-sharing octahedral tilt angles range from 8-70°. In the ninth O site, O(9) is bonded to one Ce(1), one Ce(2), one Y(1), and one Y(3) atom to form OCe2Y2 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(7)CeY3 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(14)Sr2Ce2Cu2 octahedra,  an edgeedge with one O(7)CeY3 tetrahedra,  an edgeedge with one O(8)CeY3 tetrahedra, and edges with two equivalent O(9)Ce2Y2 tetrahedra. The corner-sharing octahedral tilt angles are 71°. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Y(2), one Y(3), one Fe(1), and one Fe(2) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Y(1), one Y(2), one Fe(1), and one Cu(1) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Y(1), one Y(3), one Fe(2), and one Cu(1) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Sr(4), one Sr(6), one Ce(2), one Y(4), one Fe(3), and one Cu(3) atom. In the fourteenth O site, O(14) is bonded to one Sr(4), one Sr(5), one Ce(1), one Ce(2), one Cu(2), and one Cu(3) atom to form distorted OSr2Ce2Cu2 octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(5)Sr5Cu octahedra,  a cornercorner with one O(1)Sr5Fe octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(6)Sr5Fe octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(7)CeY3 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  a faceface with one O(4)Sr5Cu octahedra,  a faceface with one O(5)Sr5Cu octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 39-59°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(5), one Sr(6), one Ce(1), one Y(4), one Fe(3), and one Cu(2) atom.
Sr6Ce2Y4Fe3(CuO8)3 crystallizes in the monoclinic Cm space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), two equivalent O(10), and two equivalent O(12) atoms. The Sr(1)-O(2) bond length is 2.88 Å. The Sr(1)-O(3) bond length is 2.62 Å. The Sr(1)-O(4) bond length is 2.41 Å. Both Sr(1)-O(1) bond lengths are 2.74 Å. Both Sr(1)-O(10) bond lengths are 2.94 Å. Both Sr(1)-O(12) bond lengths are 2.81 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(10), two equivalent O(11), and two equivalent O(2) atoms. The Sr(2)-O(1) bond length is 2.88 Å. The Sr(2)-O(3) bond length is 2.63 Å. The Sr(2)-O(5) bond length is 2.41 Å. Both Sr(2)-O(10) bond lengths are 2.94 Å. Both Sr(2)-O(11) bond lengths are 2.81 Å. Both Sr(2)-O(2) bond lengths are 2.74 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(6), two equivalent O(11), two equivalent O(12), and two equivalent O(3) atoms. The Sr(3)-O(1) bond length is 2.72 Å. The Sr(3)-O(2) bond length is 2.72 Å. The Sr(3)-O(6) bond length is 2.52 Å. Both Sr(3)-O(11) bond lengths are 2.83 Å. Both Sr(3)-O(12) bond lengths are 2.84 Å. Both Sr(3)-O(3) bond lengths are 2.75 Å. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(13), two equivalent O(14), and two equivalent O(4) atoms. The Sr(4)-O(1) bond length is 2.54 Å. The Sr(4)-O(5) bond length is 2.61 Å. The Sr(4)-O(6) bond length is 2.88 Å. Both Sr(4)-O(13) bond lengths are 2.92 Å. Both Sr(4)-O(14) bond lengths are 2.78 Å. Both Sr(4)-O(4) bond lengths are 2.76 Å. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(2), one O(4), one O(6), two equivalent O(14), two equivalent O(15), and two equivalent O(5) atoms. The Sr(5)-O(2) bond length is 2.54 Å. The Sr(5)-O(4) bond length is 2.61 Å. The Sr(5)-O(6) bond length is 2.87 Å. Both Sr(5)-O(14) bond lengths are 2.78 Å. Both Sr(5)-O(15) bond lengths are 2.92 Å. Both Sr(5)-O(5) bond lengths are 2.76 Å. In the sixth Sr site, Sr(6) is bonded in a 9-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(13), two equivalent O(15), and two equivalent O(6) atoms. The Sr(6)-O(3) bond length is 2.45 Å. The Sr(6)-O(4) bond length is 2.76 Å. The Sr(6)-O(5) bond length is 2.76 Å. Both Sr(6)-O(13) bond lengths are 2.86 Å. Both Sr(6)-O(15) bond lengths are 2.86 Å. Both Sr(6)-O(6) bond lengths are 2.74 Å. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(14), two equivalent O(15), two equivalent O(7), and two equivalent O(9) atoms. Both Ce(1)-O(14) bond lengths are 2.54 Å. Both Ce(1)-O(15) bond lengths are 2.51 Å. Both Ce(1)-O(7) bond lengths are 2.25 Å. Both Ce(1)-O(9) bond lengths are 2.29 Å. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(13), two equivalent O(14), two equivalent O(8), and two equivalent O(9) atoms. Both Ce(2)-O(13) bond lengths are 2.52 Å. Both Ce(2)-O(14) bond lengths are 2.54 Å. Both Ce(2)-O(8) bond lengths are 2.25 Å. Both Ce(2)-O(9) bond lengths are 2.29 Å. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(11), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. Both Y(1)-O(11) bond lengths are 2.49 Å. Both Y(1)-O(12) bond lengths are 2.51 Å. Both Y(1)-O(8) bond lengths are 2.30 Å. Both Y(1)-O(9) bond lengths are 2.32 Å. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms. Both Y(2)-O(10) bond lengths are 2.51 Å. Both Y(2)-O(11) bond lengths are 2.50 Å. Both Y(2)-O(7) bond lengths are 2.31 Å. Both Y(2)-O(8) bond lengths are 2.30 Å. In the third Y site, Y(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(7), and two equivalent O(9) atoms. Both Y(3)-O(10) bond lengths are 2.49 Å. Both Y(3)-O(12) bond lengths are 2.50 Å. Both Y(3)-O(7) bond lengths are 2.30 Å. Both Y(3)-O(9) bond lengths are 2.31 Å. In the fourth Y site, Y(4) is bonded in a body-centered cubic geometry to two equivalent O(13), two equivalent O(15), two equivalent O(7), and two equivalent O(8) atoms. Both Y(4)-O(13) bond lengths are 2.51 Å. Both Y(4)-O(15) bond lengths are 2.50 Å. Both Y(4)-O(7) bond lengths are 2.30 Å. Both Y(4)-O(8) bond lengths are 2.31 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(11) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Fe(2)O5 trigonal bipyramids. The Fe(1)-O(2) bond length is 1.90 Å. Both Fe(1)-O(10) bond lengths are 1.98 Å. Both Fe(1)-O(11) bond lengths are 1.96 Å. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(10), and two equivalent O(12) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Fe(1)O5 trigonal bipyramids. The Fe(2)-O(1) bond length is 1.90 Å. Both Fe(2)-O(10) bond lengths are 1.98 Å. Both Fe(2)-O(12) bond lengths are 1.96 Å. In the third Fe site, Fe(3) is bonded to one O(6), two equivalent O(13), and two equivalent O(15) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent Cu(2)O5 square pyramids and corners with two equivalent Cu(3)O5 square pyramids. The Fe(3)-O(6) bond length is 1.88 Å. Both Fe(3)-O(13) bond lengths are 1.96 Å. Both Fe(3)-O(15) bond lengths are 1.97 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(3), two equivalent O(11), and two equivalent O(12) atoms to form CuO5 square pyramids that share corners with two equivalent Fe(1)O5 trigonal bipyramids and corners with two equivalent Fe(2)O5 trigonal bipyramids. The Cu(1)-O(3) bond length is 2.09 Å. Both Cu(1)-O(11) bond lengths are 1.98 Å. Both Cu(1)-O(12) bond lengths are 1.98 Å. In the second Cu site, Cu(2) is bonded to one O(5), two equivalent O(14), and two equivalent O(15) atoms to form CuO5 square pyramids that share corners with two equivalent Cu(3)O5 square pyramids and corners with two equivalent Fe(3)O5 trigonal bipyramids. The Cu(2)-O(5) bond length is 2.14 Å. Both Cu(2)-O(14) bond lengths are 1.96 Å. Both Cu(2)-O(15) bond lengths are 1.97 Å. In the third Cu site, Cu(3) is bonded to one O(4), two equivalent O(13), and two equivalent O(14) atoms to form CuO5 square pyramids that share corners with two equivalent Cu(2)O5 square pyramids and corners with two equivalent Fe(3)O5 trigonal bipyramids. The Cu(3)-O(4) bond length is 2.14 Å. Both Cu(3)-O(13) bond lengths are 1.97 Å. Both Cu(3)-O(14) bond lengths are 1.96 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Sr(4), two equivalent Sr(1), and one Fe(2) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(3)Sr5Cu octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(1)Sr5Fe octahedra,  an edgeedge with one O(5)Sr5Cu octahedra,  an edgeedge with one O(6)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with two equivalent O(2)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the second O site, O(2) is bonded to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(2), and one Fe(1) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(3)Sr5Cu octahedra,  a cornercorner with one O(1)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(2)Sr5Fe octahedra,  an edgeedge with one O(4)Sr5Cu octahedra,  an edgeedge with one O(6)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(5)Sr5Cu octahedra, and edges with two equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-39°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(6), two equivalent Sr(3), and one Cu(1) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(1)Sr5Fe octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(3)Sr5Cu octahedra,  an edgeedge with one O(4)Sr5Cu octahedra,  an edgeedge with one O(5)Sr5Cu octahedra, edges with two equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(2)Sr5Fe octahedra, and edges with two equivalent O(6)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 10-13°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(5), one Sr(6), two equivalent Sr(4), and one Cu(3) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(5)Sr5Cu octahedra,  a cornercorner with one O(6)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(4)Sr5Cu octahedra,  an edgeedge with one O(3)Sr5Cu octahedra,  an edgeedge with one O(2)Sr5Fe octahedra, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(6)Sr5Fe octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-53°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(4), one Sr(6), two equivalent Sr(5), and one Cu(2) atom to form distorted OSr5Cu octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(6)Sr5Fe octahedra, corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(5)Sr5Cu octahedra,  an edgeedge with one O(3)Sr5Cu octahedra,  an edgeedge with one O(1)Sr5Fe octahedra, edges with two equivalent O(4)Sr5Cu octahedra, edges with two equivalent O(2)Sr5Fe octahedra, edges with two equivalent O(6)Sr5Fe octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 13-53°. In the sixth O site, O(6) is bonded to one Sr(3), one Sr(4), one Sr(5), two equivalent Sr(6), and one Fe(3) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(5)Sr5Cu octahedra, corners with two equivalent O(6)Sr5Fe octahedra, corners with four equivalent O(14)Sr2Ce2Cu2 octahedra,  an edgeedge with one O(1)Sr5Fe octahedra,  an edgeedge with one O(2)Sr5Fe octahedra, edges with two equivalent O(3)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Cu octahedra, and edges with two equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 10-59°. In the seventh O site, O(7) is bonded to one Ce(1), one Y(2), one Y(3), and one Y(4) atom to form OCeY3 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  an edgeedge with one O(8)CeY3 tetrahedra, and edges with two equivalent O(7)CeY3 tetrahedra. The corner-sharing octahedral tilt angles range from 7-70°. In the eighth O site, O(8) is bonded to one Ce(2), one Y(1), one Y(2), and one Y(4) atom to form OCeY3 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(7)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  an edgeedge with one O(7)CeY3 tetrahedra, and edges with two equivalent O(8)CeY3 tetrahedra. The corner-sharing octahedral tilt angles range from 8-70°. In the ninth O site, O(9) is bonded to one Ce(1), one Ce(2), one Y(1), and one Y(3) atom to form OCe2Y2 tetrahedra that share corners with two equivalent O(14)Sr2Ce2Cu2 octahedra, corners with two equivalent O(7)CeY3 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(14)Sr2Ce2Cu2 octahedra,  an edgeedge with one O(7)CeY3 tetrahedra,  an edgeedge with one O(8)CeY3 tetrahedra, and edges with two equivalent O(9)Ce2Y2 tetrahedra. The corner-sharing octahedral tilt angles are 71°. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Y(2), one Y(3), one Fe(1), and one Fe(2) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Y(1), one Y(2), one Fe(1), and one Cu(1) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Y(1), one Y(3), one Fe(2), and one Cu(1) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Sr(4), one Sr(6), one Ce(2), one Y(4), one Fe(3), and one Cu(3) atom. In the fourteenth O site, O(14) is bonded to one Sr(4), one Sr(5), one Ce(1), one Ce(2), one Cu(2), and one Cu(3) atom to form distorted OSr2Ce2Cu2 octahedra that share  a cornercorner with one O(4)Sr5Cu octahedra,  a cornercorner with one O(5)Sr5Cu octahedra,  a cornercorner with one O(1)Sr5Fe octahedra,  a cornercorner with one O(2)Sr5Fe octahedra, corners with two equivalent O(6)Sr5Fe octahedra, corners with two equivalent O(9)Ce2Y2 tetrahedra, corners with two equivalent O(7)CeY3 tetrahedra, corners with two equivalent O(8)CeY3 tetrahedra,  an edgeedge with one O(9)Ce2Y2 tetrahedra,  a faceface with one O(4)Sr5Cu octahedra,  a faceface with one O(5)Sr5Cu octahedra, and faces with two equivalent O(14)Sr2Ce2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 39-59°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(5), one Sr(6), one Ce(1), one Y(4), one Fe(3), and one Cu(2) atom.