Sr2CoO3 crystallizes in the orthorhombic Fmmm space group. Sr(1) is bonded to one O(1) and five equivalent O(2) atoms to form SrO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with five equivalent Sr(1)O6 octahedra, edges with four equivalent Co(1)O6 octahedra, and edges with eight equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, edges with four equivalent Co(1)O6 octahedra, and edges with eight equivalent Sr(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Co(1) atoms to form OSr2Co4 octahedra that share corners with two equivalent O(2)Sr5Co octahedra, corners with four equivalent O(1)Sr2Co4 octahedra, edges with four equivalent O(1)Sr2Co4 octahedra, and edges with eight equivalent O(2)Sr5Co octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Co(1) atom to form OSr5Co octahedra that share  a cornercorner with one O(1)Sr2Co4 octahedra, corners with five equivalent O(2)Sr5Co octahedra, edges with four equivalent O(1)Sr2Co4 octahedra, and edges with eight equivalent O(2)Sr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-7°.
Sr2CoO3 crystallizes in the orthorhombic Fmmm space group. Sr(1) is bonded to one O(1) and five equivalent O(2) atoms to form SrO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with five equivalent Sr(1)O6 octahedra, edges with four equivalent Co(1)O6 octahedra, and edges with eight equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. The Sr(1)-O(1) bond length is 2.27 Å. There are a spread of Sr(1)-O(2) bond distances ranging from 2.52-2.86 Å. Co(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, edges with four equivalent Co(1)O6 octahedra, and edges with eight equivalent Sr(1)O6 octahedra. The corner-sharing octahedra are not tilted. Both Co(1)-O(2) bond lengths are 2.10 Å. There are two shorter (2.51 Å) and two longer (2.55 Å) Co(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Co(1) atoms to form OSr2Co4 octahedra that share corners with two equivalent O(2)Sr5Co octahedra, corners with four equivalent O(1)Sr2Co4 octahedra, edges with four equivalent O(1)Sr2Co4 octahedra, and edges with eight equivalent O(2)Sr5Co octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Co(1) atom to form OSr5Co octahedra that share  a cornercorner with one O(1)Sr2Co4 octahedra, corners with five equivalent O(2)Sr5Co octahedra, edges with four equivalent O(1)Sr2Co4 octahedra, and edges with eight equivalent O(2)Sr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-7°.