Co7Sb2O12 is Spinel-like structured and crystallizes in the monoclinic C2/c space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CoO4 tetrahedra that share corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, and corners with four 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(5) and two equivalent O(6) atoms to form CoO4 tetrahedra that share corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-62°. In the third Co site, Co(3) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the fifth Co site, Co(5) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)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. Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form SbO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. There are six 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(5) atom. In the second O site, O(2) is bonded to one Co(1), one Co(3), and two equivalent Sb(1) atoms to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(3)Co3Sb trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and edges with two equivalent O(3)Co3Sb trigonal pyramids. In the third O site, O(3) is bonded to one Co(1), two equivalent Co(3), and one Sb(1) atom to form distorted OCo3Sb trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  an edgeedge with one O(3)Co3Sb trigonal pyramid, and edges with two equivalent O(2)Co2Sb2 trigonal pyramids. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(4), one Co(5), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), one Co(5), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), one Co(4), and one Sb(1) atom.
Co7Sb2O12 is Spinel-like structured and crystallizes in the monoclinic C2/c space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CoO4 tetrahedra that share corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. The Co(1)-O(1) bond length is 1.92 Å. The Co(1)-O(2) bond length is 2.07 Å. The Co(1)-O(3) bond length is 2.02 Å. The Co(1)-O(4) bond length is 1.98 Å. In the second Co site, Co(2) is bonded to two equivalent O(5) and two equivalent O(6) atoms to form CoO4 tetrahedra that share corners with two equivalent Co(4)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with four equivalent Co(3)O6 octahedra, and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-62°. Both Co(2)-O(5) bond lengths are 1.99 Å. Both Co(2)-O(6) bond lengths are 1.97 Å. In the third Co site, Co(3) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. The Co(3)-O(1) bond length is 1.98 Å. The Co(3)-O(2) bond length is 2.19 Å. The Co(3)-O(5) bond length is 2.11 Å. The Co(3)-O(6) bond length is 2.09 Å. There is one shorter (2.09 Å) and one longer (2.13 Å) Co(3)-O(3) bond length. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(3)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Co(4)-O(1) bond lengths are 2.02 Å. Both Co(4)-O(4) bond lengths are 2.15 Å. Both Co(4)-O(6) bond lengths are 2.16 Å. In the fifth Co site, Co(5) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)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(5)-O(1) bond lengths are 2.03 Å. Both Co(5)-O(4) bond lengths are 2.16 Å. Both Co(5)-O(5) bond lengths are 2.11 Å. Sb(1) is bonded to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms to form SbO6 octahedra that share corners with two equivalent Co(2)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with three equivalent Co(3)O6 octahedra. The Sb(1)-O(3) bond length is 1.98 Å. The Sb(1)-O(4) bond length is 1.97 Å. The Sb(1)-O(5) bond length is 1.98 Å. The Sb(1)-O(6) bond length is 1.97 Å. There is one shorter (2.06 Å) and one longer (2.07 Å) Sb(1)-O(2) bond length. There are six 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(5) atom. In the second O site, O(2) is bonded to one Co(1), one Co(3), and two equivalent Sb(1) atoms to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(3)Co3Sb trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and edges with two equivalent O(3)Co3Sb trigonal pyramids. In the third O site, O(3) is bonded to one Co(1), two equivalent Co(3), and one Sb(1) atom to form distorted OCo3Sb trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  an edgeedge with one O(3)Co3Sb trigonal pyramid, and edges with two equivalent O(2)Co2Sb2 trigonal pyramids. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(4), one Co(5), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), one Co(5), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), one Co(4), and one Sb(1) atom.