BaSr(CoO3)2 crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Co(1)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Co(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Ba(1)O12 cuboctahedra, and faces with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. Co(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form CoO6 octahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Co(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Sr(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Sr(1), and two equivalent Co(1) atoms.
BaSr(CoO3)2 crystallizes in the hexagonal P-6m2 space group. Ba(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(1)O12 cuboctahedra, corners with six equivalent Co(1)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. All Ba(1)-O(1) bond lengths are 2.97 Å. All Ba(1)-O(2) bond lengths are 2.82 Å. Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Co(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Ba(1)O12 cuboctahedra, and faces with six equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. All Sr(1)-O(1) bond lengths are 2.82 Å. All Sr(1)-O(2) bond lengths are 2.96 Å. Co(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form CoO6 octahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Ba(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Co(1)O6 octahedra. All Co(1)-O(1) bond lengths are 1.89 Å. All Co(1)-O(2) bond lengths are 1.89 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Sr(1), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Ba(1), two equivalent Sr(1), and two equivalent Co(1) atoms.