Sr2OsNiO6 crystallizes in the tetragonal I4/m space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Os(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-26°. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted NiO6 octahedra that share corners with six equivalent Os(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-26°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Os(1), and one Ni(1) atom. In the second O site, O(2) is bonded to four equivalent Sr(1), one Os(1), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing OSr4NiOs octahedra. The corner-sharing octahedral tilt angles range from 0-12°.
Sr2OsNiO6 crystallizes in the tetragonal I4/m space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Sr(1)-O(1) bond lengths are 2.67 Å. All Sr(1)-O(2) bond lengths are 2.67 Å. Os(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form OsO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-26°. Both Os(1)-O(2) bond lengths are 1.97 Å. All Os(1)-O(1) bond lengths are 1.93 Å. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted NiO6 octahedra that share corners with six equivalent Os(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-26°. Both Ni(1)-O(2) bond lengths are 2.52 Å. All Ni(1)-O(1) bond lengths are 1.92 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Os(1), and one Ni(1) atom. In the second O site, O(2) is bonded to four equivalent Sr(1), one Os(1), and one Ni(1) atom to form a mixture of distorted corner and edge-sharing OSr4NiOs octahedra. The corner-sharing octahedral tilt angles range from 0-12°.