Sr2CeYRuCu2O10 crystallizes in the tetragonal I4mm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ru(1)O6 octahedra, and faces with four equivalent Cu(1)O5 square pyramids. In the second Sr site, Sr(2) is bonded to four equivalent O(2), four equivalent O(4), and four equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Ru(1)O6 octahedra, and faces with four equivalent Cu(2)O5 square pyramids. Ce(1) is bonded in a body-centered cubic geometry to four equivalent O(4) and four equivalent O(5) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(5) atoms. Ru(1) is bonded to one O(1), one O(2), and four equivalent O(6) atoms to form RuO6 octahedra that share corners with four equivalent Ru(1)O6 octahedra,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(2)O5 square pyramid, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1) and four equivalent O(3) atoms to form CuO5 square pyramids that share  a cornercorner with one Ru(1)O6 octahedra, corners with four equivalent Cu(1)O5 square pyramids, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the second Cu site, Cu(2) is bonded to one O(2) and four equivalent O(4) atoms to form CuO5 square pyramids that share  a cornercorner with one Ru(1)O6 octahedra, corners with four equivalent Cu(2)O5 square pyramids, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are six inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1), one Ru(1), and one Cu(1) atom to form a mixture of distorted edge and corner-sharing OSr4CuRu octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second O site, O(2) is bonded to four equivalent Sr(2), one Ru(1), and one Cu(2) atom to form a mixture of edge and corner-sharing OSr4CuRu octahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Ce(1), and two equivalent Cu(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Ce(1) and two equivalent Y(1) atoms to form a mixture of edge and corner-sharing OCe2Y2 tetrahedra. In the sixth O site, O(6) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ru(1) atoms.
Sr2CeYRuCu2O10 crystallizes in the tetragonal I4mm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ru(1)O6 octahedra, and faces with four equivalent Cu(1)O5 square pyramids. All Sr(1)-O(1) bond lengths are 2.75 Å. All Sr(1)-O(3) bond lengths are 2.87 Å. All Sr(1)-O(6) bond lengths are 3.05 Å. In the second Sr site, Sr(2) is bonded to four equivalent O(2), four equivalent O(4), and four equivalent O(6) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with four equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Ru(1)O6 octahedra, and faces with four equivalent Cu(2)O5 square pyramids. All Sr(2)-O(2) bond lengths are 2.74 Å. All Sr(2)-O(4) bond lengths are 2.95 Å. All Sr(2)-O(6) bond lengths are 2.96 Å. Ce(1) is bonded in a body-centered cubic geometry to four equivalent O(4) and four equivalent O(5) atoms. All Ce(1)-O(4) bond lengths are 2.49 Å. All Ce(1)-O(5) bond lengths are 2.29 Å. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(5) atoms. All Y(1)-O(3) bond lengths are 2.47 Å. All Y(1)-O(5) bond lengths are 2.34 Å. Ru(1) is bonded to one O(1), one O(2), and four equivalent O(6) atoms to form RuO6 octahedra that share corners with four equivalent Ru(1)O6 octahedra,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Cu(2)O5 square pyramid, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. The Ru(1)-O(1) bond length is 2.02 Å. The Ru(1)-O(2) bond length is 2.04 Å. All Ru(1)-O(6) bond lengths are 1.93 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1) and four equivalent O(3) atoms to form CuO5 square pyramids that share  a cornercorner with one Ru(1)O6 octahedra, corners with four equivalent Cu(1)O5 square pyramids, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. The Cu(1)-O(1) bond length is 2.21 Å. All Cu(1)-O(3) bond lengths are 1.94 Å. In the second Cu site, Cu(2) is bonded to one O(2) and four equivalent O(4) atoms to form CuO5 square pyramids that share  a cornercorner with one Ru(1)O6 octahedra, corners with four equivalent Cu(2)O5 square pyramids, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. The Cu(2)-O(2) bond length is 2.17 Å. All Cu(2)-O(4) bond lengths are 1.95 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1), one Ru(1), and one Cu(1) atom to form a mixture of distorted edge and corner-sharing OSr4CuRu octahedra. The corner-sharing octahedral tilt angles range from 0-14°. In the second O site, O(2) is bonded to four equivalent Sr(2), one Ru(1), and one Cu(2) atom to form a mixture of edge and corner-sharing OSr4CuRu octahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Ce(1), and two equivalent Cu(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Ce(1) and two equivalent Y(1) atoms to form a mixture of edge and corner-sharing OCe2Y2 tetrahedra. In the sixth O site, O(6) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ru(1) atoms.