Sr8Ru2Fe2O13 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), two equivalent O(1), and three equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(2), and three equivalent O(1) atoms. Ru(1) is bonded in a square co-planar geometry to one O(3), one O(4), and two equivalent O(2) atoms. Fe(1) is bonded to one O(4), one O(5), one O(6), and two equivalent O(1) atoms to form corner-sharing FeO5 square pyramids. There are six inequivalent O sites. In the first O site, O(3) is bonded to four equivalent Sr(1) and two equivalent Ru(1) atoms to form OSr4Ru2 octahedra that share corners with two equivalent O(4)Sr4FeRu octahedra, corners with four equivalent O(2)Sr5Ru octahedra, corners with eight equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(4)Sr4FeRu octahedra, and faces with four equivalent O(2)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 4-63°. In the second O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Ru(1), and one Fe(1) atom to form distorted OSr4FeRu octahedra that share  a cornercorner with one O(5)Sr4Fe2 octahedra,  a cornercorner with one O(3)Sr4Ru2 octahedra, corners with six equivalent O(1)Sr5Fe octahedra, corners with six equivalent O(2)Sr5Ru octahedra,  an edgeedge with one O(5)Sr4Fe2 octahedra,  an edgeedge with one O(3)Sr4Ru2 octahedra,  a faceface with one O(6)Sr4Fe2 octahedra, faces with two equivalent O(1)Sr5Fe octahedra, and faces with two equivalent O(2)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 4-61°. In the third O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Fe(1) atoms to form OSr4Fe2 octahedra that share corners with two equivalent O(4)Sr4FeRu octahedra, corners with four equivalent O(1)Sr5Fe octahedra, corners with eight equivalent O(2)Sr5Ru octahedra, edges with two equivalent O(4)Sr4FeRu octahedra, faces with two equivalent O(6)Sr4Fe2 octahedra, and faces with four equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 4-58°. In the fourth O site, O(6) is bonded to four equivalent Sr(2) and two equivalent Fe(1) atoms to form distorted OSr4Fe2 octahedra that share corners with four equivalent O(1)Sr5Fe octahedra, corners with eight equivalent O(2)Sr5Ru octahedra, faces with two equivalent O(5)Sr4Fe2 octahedra, faces with two equivalent O(4)Sr4FeRu octahedra, and faces with four equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 46-55°. In the fifth O site, O(1) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Fe(1) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(5)Sr4Fe2 octahedra,  a cornercorner with one O(6)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Ru2 octahedra, corners with two equivalent O(2)Sr5Ru octahedra, corners with three equivalent O(4)Sr4FeRu octahedra, corners with three equivalent O(1)Sr5Fe octahedra, edges with three equivalent O(1)Sr5Fe octahedra, edges with five equivalent O(2)Sr5Ru octahedra,  a faceface with one O(5)Sr4Fe2 octahedra,  a faceface with one O(6)Sr4Fe2 octahedra, and  a faceface with one O(4)Sr4FeRu octahedra. The corner-sharing octahedral tilt angles range from 6-63°. In the sixth O site, O(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Ru(1) atom to form OSr5Ru octahedra that share  a cornercorner with one O(3)Sr4Ru2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr4Fe2 octahedra, corners with two equivalent O(1)Sr5Fe octahedra, corners with three equivalent O(4)Sr4FeRu octahedra, corners with three equivalent O(2)Sr5Ru octahedra, edges with three equivalent O(2)Sr5Ru octahedra, edges with five equivalent O(1)Sr5Fe octahedra,  a faceface with one O(4)Sr4FeRu octahedra, and  a faceface with one O(3)Sr4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 3-61°.
Sr8Ru2Fe2O13 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), two equivalent O(1), and three equivalent O(2) atoms. The Sr(1)-O(3) bond length is 2.72 Å. The Sr(1)-O(4) bond length is 2.58 Å. There is one shorter (2.48 Å) and one longer (2.57 Å) Sr(1)-O(1) bond length. There are two shorter (2.69 Å) and one longer (2.76 Å) Sr(1)-O(2) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(2), and three equivalent O(1) atoms. The Sr(2)-O(4) bond length is 2.74 Å. The Sr(2)-O(5) bond length is 2.64 Å. The Sr(2)-O(6) bond length is 2.68 Å. There is one shorter (2.53 Å) and one longer (2.72 Å) Sr(2)-O(2) bond length. There are a spread of Sr(2)-O(1) bond distances ranging from 2.62-2.84 Å. Ru(1) is bonded in a square co-planar geometry to one O(3), one O(4), and two equivalent O(2) atoms. The Ru(1)-O(3) bond length is 1.90 Å. The Ru(1)-O(4) bond length is 1.99 Å. Both Ru(1)-O(2) bond lengths are 2.07 Å. Fe(1) is bonded to one O(4), one O(5), one O(6), and two equivalent O(1) atoms to form corner-sharing FeO5 square pyramids. The Fe(1)-O(4) bond length is 2.00 Å. The Fe(1)-O(5) bond length is 1.97 Å. The Fe(1)-O(6) bond length is 1.89 Å. Both Fe(1)-O(1) bond lengths are 2.04 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded to four equivalent Sr(1) and two equivalent Ru(1) atoms to form OSr4Ru2 octahedra that share corners with two equivalent O(4)Sr4FeRu octahedra, corners with four equivalent O(2)Sr5Ru octahedra, corners with eight equivalent O(1)Sr5Fe octahedra, edges with two equivalent O(4)Sr4FeRu octahedra, and faces with four equivalent O(2)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 4-63°. In the second O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Ru(1), and one Fe(1) atom to form distorted OSr4FeRu octahedra that share  a cornercorner with one O(5)Sr4Fe2 octahedra,  a cornercorner with one O(3)Sr4Ru2 octahedra, corners with six equivalent O(1)Sr5Fe octahedra, corners with six equivalent O(2)Sr5Ru octahedra,  an edgeedge with one O(5)Sr4Fe2 octahedra,  an edgeedge with one O(3)Sr4Ru2 octahedra,  a faceface with one O(6)Sr4Fe2 octahedra, faces with two equivalent O(1)Sr5Fe octahedra, and faces with two equivalent O(2)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 4-61°. In the third O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Fe(1) atoms to form OSr4Fe2 octahedra that share corners with two equivalent O(4)Sr4FeRu octahedra, corners with four equivalent O(1)Sr5Fe octahedra, corners with eight equivalent O(2)Sr5Ru octahedra, edges with two equivalent O(4)Sr4FeRu octahedra, faces with two equivalent O(6)Sr4Fe2 octahedra, and faces with four equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 4-58°. In the fourth O site, O(6) is bonded to four equivalent Sr(2) and two equivalent Fe(1) atoms to form distorted OSr4Fe2 octahedra that share corners with four equivalent O(1)Sr5Fe octahedra, corners with eight equivalent O(2)Sr5Ru octahedra, faces with two equivalent O(5)Sr4Fe2 octahedra, faces with two equivalent O(4)Sr4FeRu octahedra, and faces with four equivalent O(1)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 46-55°. In the fifth O site, O(1) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Fe(1) atom to form distorted OSr5Fe octahedra that share  a cornercorner with one O(5)Sr4Fe2 octahedra,  a cornercorner with one O(6)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Ru2 octahedra, corners with two equivalent O(2)Sr5Ru octahedra, corners with three equivalent O(4)Sr4FeRu octahedra, corners with three equivalent O(1)Sr5Fe octahedra, edges with three equivalent O(1)Sr5Fe octahedra, edges with five equivalent O(2)Sr5Ru octahedra,  a faceface with one O(5)Sr4Fe2 octahedra,  a faceface with one O(6)Sr4Fe2 octahedra, and  a faceface with one O(4)Sr4FeRu octahedra. The corner-sharing octahedral tilt angles range from 6-63°. In the sixth O site, O(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Ru(1) atom to form OSr5Ru octahedra that share  a cornercorner with one O(3)Sr4Ru2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr4Fe2 octahedra, corners with two equivalent O(1)Sr5Fe octahedra, corners with three equivalent O(4)Sr4FeRu octahedra, corners with three equivalent O(2)Sr5Ru octahedra, edges with three equivalent O(2)Sr5Ru octahedra, edges with five equivalent O(1)Sr5Fe octahedra,  a faceface with one O(4)Sr4FeRu octahedra, and  a faceface with one O(3)Sr4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 3-61°.