Sr2FeOsO6 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(2) and nine equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Os(1)O6 octahedra, faces with three equivalent Os(2)O6 octahedra, and faces with four equivalent Fe(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Os(2)O6 octahedra, faces with three equivalent Os(1)O6 octahedra, and faces with four equivalent Fe(1)O6 octahedra. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to six equivalent O(2) atoms to form OsO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. In the second Os site, Os(2) is bonded to six equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Os(1)O6 octahedra, corners with three equivalent Os(2)O6 octahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), three equivalent Sr(1), one Os(2), and one Fe(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4FeOs octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to one Sr(1), three equivalent Sr(2), one Os(1), and one Fe(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4FeOs octahedra. The corner-sharing octahedral tilt angles range from 0-61°.
Sr2FeOsO6 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(2) and nine equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Os(1)O6 octahedra, faces with three equivalent Os(2)O6 octahedra, and faces with four equivalent Fe(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.84 Å. There are three shorter (2.80 Å) and six longer (2.82 Å) Sr(1)-O(1) bond lengths. In the second Sr site, Sr(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Os(2)O6 octahedra, faces with three equivalent Os(1)O6 octahedra, and faces with four equivalent Fe(1)O6 octahedra. All Sr(2)-O(1) bond lengths are 2.77 Å. There are six shorter (2.82 Å) and three longer (2.85 Å) Sr(2)-O(2) bond lengths. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to six equivalent O(2) atoms to form OsO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 1°. All Os(1)-O(2) bond lengths are 1.96 Å. In the second Os site, Os(2) is bonded to six equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Os(2)-O(1) bond lengths are 1.98 Å. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Os(1)O6 octahedra, corners with three equivalent Os(2)O6 octahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. All Fe(1)-O(1) bond lengths are 2.02 Å. All Fe(1)-O(2) bond lengths are 2.00 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), three equivalent Sr(1), one Os(2), and one Fe(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4FeOs octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to one Sr(1), three equivalent Sr(2), one Os(1), and one Fe(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4FeOs octahedra. The corner-sharing octahedral tilt angles range from 0-61°.