Co5SbO8 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are eight inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one Co(6)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(7)O6 octahedra, corners with two equivalent Co(8)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. In the second Co site, Co(2) is bonded to two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(7)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(4)O6 octahedra, edges with two equivalent Co(6)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(6)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the fifth Co site, Co(5) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(7)O6 octahedra,  a cornercorner with one Co(8)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(6)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. In the sixth Co site, Co(6) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the seventh Co site, Co(7) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the eighth Co site, Co(8) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(7)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with three equivalent Co(1)O4 tetrahedra, corners with three equivalent Co(5)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(3), one Co(4), and one Co(6) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(5), one Co(7), and one Co(8) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Co(3), one Co(4), one Co(5), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(7), one Co(8), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(3), one Co(5), one Co(6), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(7), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Co(4), one Co(5), one Co(6), and one Sb(1) atom. In the eighth O site, O(8) is bonded to one Co(1), one Co(2), one Co(8), and one Sb(1) atom to form distorted corner-sharing OCo3Sb trigonal pyramids.
Co5SbO8 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are eight inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  a cornercorner with one Co(6)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(7)O6 octahedra, corners with two equivalent Co(8)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. The Co(1)-O(1) bond length is 2.00 Å. The Co(1)-O(4) bond length is 2.01 Å. The Co(1)-O(6) bond length is 2.02 Å. The Co(1)-O(8) bond length is 2.01 Å. In the second Co site, Co(2) is bonded to two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(7)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(2)-O(2) bond lengths are 1.90 Å. Both Co(2)-O(6) bond lengths are 2.14 Å. Both Co(2)-O(8) bond lengths are 2.12 Å. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(4)O6 octahedra, edges with two equivalent Co(6)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(3)-O(1) bond lengths are 1.93 Å. Both Co(3)-O(3) bond lengths are 2.10 Å. Both Co(3)-O(5) bond lengths are 2.13 Å. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(6)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(4)-O(1) bond lengths are 2.08 Å. Both Co(4)-O(3) bond lengths are 2.14 Å. Both Co(4)-O(7) bond lengths are 2.13 Å. In the fifth Co site, Co(5) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(7)O6 octahedra,  a cornercorner with one Co(8)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(6)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. The Co(5)-O(2) bond length is 2.00 Å. The Co(5)-O(3) bond length is 2.01 Å. The Co(5)-O(5) bond length is 2.01 Å. The Co(5)-O(7) bond length is 2.01 Å. In the sixth Co site, Co(6) is bonded to two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Co(5)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(6)-O(1) bond lengths are 2.05 Å. Both Co(6)-O(5) bond lengths are 2.16 Å. Both Co(6)-O(7) bond lengths are 2.13 Å. In the seventh Co site, Co(7) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(7)-O(2) bond lengths are 2.07 Å. Both Co(7)-O(4) bond lengths are 2.13 Å. Both Co(7)-O(6) bond lengths are 2.14 Å. In the eighth Co site, Co(8) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent Co(5)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(7)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(8)-O(2) bond lengths are 2.09 Å. Both Co(8)-O(4) bond lengths are 2.12 Å. Both Co(8)-O(8) bond lengths are 2.12 Å. Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with three equivalent Co(1)O4 tetrahedra, corners with three equivalent Co(5)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. The Sb(1)-O(3) bond length is 2.03 Å. The Sb(1)-O(4) bond length is 2.01 Å. The Sb(1)-O(5) bond length is 2.03 Å. The Sb(1)-O(6) bond length is 2.02 Å. The Sb(1)-O(7) bond length is 2.01 Å. The Sb(1)-O(8) bond length is 2.02 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(3), one Co(4), and one Co(6) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(5), one Co(7), and one Co(8) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Co(3), one Co(4), one Co(5), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(7), one Co(8), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(3), one Co(5), one Co(6), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(7), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Co(4), one Co(5), one Co(6), and one Sb(1) atom. In the eighth O site, O(8) is bonded to one Co(1), one Co(2), one Co(8), and one Sb(1) atom to form distorted corner-sharing OCo3Sb trigonal pyramids.