Co5SbO8 is Spinel-like structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2) and three equivalent O(1) atoms to form CoO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra and corners with nine equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-60°. In the second Co site, Co(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. Sb(1) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra and edges with six equivalent Co(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Co(1), two equivalent Co(2), and one Sb(1) atom. In the second O site, O(2) is bonded to one Co(1) and three equivalent Co(2) atoms to form distorted corner-sharing OCo4 trigonal pyramids.
Co5SbO8 is Spinel-like structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2) and three equivalent O(1) atoms to form CoO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra and corners with nine equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-60°. The Co(1)-O(2) bond length is 1.90 Å. All Co(1)-O(1) bond lengths are 1.96 Å. In the second Co site, Co(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Co(2)O6 octahedra. Both Co(2)-O(2) bond lengths are 2.00 Å. All Co(2)-O(1) bond lengths are 2.10 Å. Sb(1) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra and edges with six equivalent Co(2)O6 octahedra. All Sb(1)-O(1) bond lengths are 2.00 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Co(1), two equivalent Co(2), and one Sb(1) atom. In the second O site, O(2) is bonded to one Co(1) and three equivalent Co(2) atoms to form distorted corner-sharing OCo4 trigonal pyramids.