Co7Sb2O12 is Spinel-like structured and crystallizes in the monoclinic C2 space group. There are eight inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form CoO4 tetrahedra that share corners with three equivalent Co(2)O6 octahedra, corners with three equivalent Co(4)O6 octahedra, corners with three equivalent Co(5)O6 octahedra, and corners with three equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. In the third Co site, Co(3) is bonded to one O(1), one O(2), one O(6), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(8)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with two equivalent Co(6)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-63°. In the fourth Co site, Co(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. In the fifth Co site, Co(5) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. In the sixth Co site, Co(6) is bonded to one O(11), one O(12), two equivalent O(10), and two equivalent O(9) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O4 tetrahedra, corners with four equivalent Co(7)O4 tetrahedra, edges with two equivalent Co(6)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the seventh Co site, Co(7) is bonded to one O(10), one O(11), one O(12), and one O(3) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(5)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(8)O6 octahedra, corners with three equivalent Sb(1)O6 octahedra, and corners with four equivalent Co(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-60°. In the eighth Co site, Co(8) is bonded to two equivalent O(11), two equivalent O(12), and two equivalent O(9) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O4 tetrahedra, corners with four equivalent Co(7)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Co(6)O6 octahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(11), one O(12), one O(2), and one O(6) atom to form SbO6 octahedra that share corners with three equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(7)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with two equivalent Co(6)O6 octahedra. In the second Sb site, Sb(2) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(5)O6 octahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Co(2), one Co(3), one Co(5), and one Sb(1) atom to form distorted OCo3Sb trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(6)Co2Sb2 trigonal pyramid. In the second O site, O(2) is bonded to one Co(2), one Co(3), one Sb(1), and one Sb(2) atom to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(6)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(1)Co3Sb trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(5), one Co(7), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(5) atom. In the sixth O site, O(6) is bonded to one Co(3), one Co(5), one Sb(1), and one Sb(2) atom to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(1)Co3Sb trigonal pyramid. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(4), one Co(5), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(5), and one Sb(2) atom. In the ninth O site, O(9) is bonded to one Co(3), one Co(8), and two equivalent Co(6) atoms to form distorted OCo4 trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid, and corners with three equivalent O(9)Co4 trigonal pyramids. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Co(7), two equivalent Co(6), and one Sb(1) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Co(6), one Co(7), one Co(8), and one Sb(1) atom. In the twelfth O site, O(12) is bonded in a rectangular see-saw-like geometry to one Co(6), one Co(7), one Co(8), and one Sb(1) atom.
Co7Sb2O12 is Spinel-like structured and crystallizes in the monoclinic C2 space group. There are eight inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form CoO4 tetrahedra that share corners with three equivalent Co(2)O6 octahedra, corners with three equivalent Co(4)O6 octahedra, corners with three equivalent Co(5)O6 octahedra, and corners with three equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. The Co(1)-O(4) bond length is 2.03 Å. The Co(1)-O(5) bond length is 1.94 Å. The Co(1)-O(7) bond length is 2.02 Å. The Co(1)-O(8) bond length is 2.05 Å. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The Co(2)-O(1) bond length is 2.17 Å. The Co(2)-O(2) bond length is 2.19 Å. The Co(2)-O(3) bond length is 2.12 Å. The Co(2)-O(4) bond length is 2.11 Å. The Co(2)-O(5) bond length is 2.02 Å. The Co(2)-O(8) bond length is 2.10 Å. In the third Co site, Co(3) is bonded to one O(1), one O(2), one O(6), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(8)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(5)O6 octahedra, corners with two equivalent Co(6)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-63°. The Co(3)-O(1) bond length is 2.05 Å. The Co(3)-O(2) bond length is 2.12 Å. The Co(3)-O(6) bond length is 2.11 Å. The Co(3)-O(9) bond length is 1.93 Å. In the fourth Co site, Co(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form CoO6 octahedra that share corners with six equivalent Co(1)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, edges with two equivalent Co(5)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Co(4)-O(4) bond lengths are 2.20 Å. Both Co(4)-O(5) bond lengths are 2.04 Å. Both Co(4)-O(7) bond lengths are 2.18 Å. In the fifth Co site, Co(5) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The Co(5)-O(1) bond length is 2.17 Å. The Co(5)-O(3) bond length is 2.14 Å. The Co(5)-O(5) bond length is 2.02 Å. The Co(5)-O(6) bond length is 2.19 Å. The Co(5)-O(7) bond length is 2.10 Å. The Co(5)-O(8) bond length is 2.11 Å. In the sixth Co site, Co(6) is bonded to one O(11), one O(12), two equivalent O(10), and two equivalent O(9) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O4 tetrahedra, corners with four equivalent Co(7)O4 tetrahedra, edges with two equivalent Co(6)O6 octahedra, edges with two equivalent Co(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The Co(6)-O(11) bond length is 2.18 Å. The Co(6)-O(12) bond length is 2.14 Å. There is one shorter (2.16 Å) and one longer (2.18 Å) Co(6)-O(10) bond length. Both Co(6)-O(9) bond lengths are 2.07 Å. In the seventh Co site, Co(7) is bonded to one O(10), one O(11), one O(12), and one O(3) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(5)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Co(8)O6 octahedra, corners with three equivalent Sb(1)O6 octahedra, and corners with four equivalent Co(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-60°. The Co(7)-O(10) bond length is 2.01 Å. The Co(7)-O(11) bond length is 2.01 Å. The Co(7)-O(12) bond length is 2.01 Å. The Co(7)-O(3) bond length is 2.03 Å. In the eighth Co site, Co(8) is bonded to two equivalent O(11), two equivalent O(12), and two equivalent O(9) atoms to form CoO6 octahedra that share corners with two equivalent Co(3)O4 tetrahedra, corners with four equivalent Co(7)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Co(6)O6 octahedra. Both Co(8)-O(11) bond lengths are 2.16 Å. Both Co(8)-O(12) bond lengths are 2.15 Å. Both Co(8)-O(9) bond lengths are 2.08 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(11), one O(12), one O(2), and one O(6) atom to form SbO6 octahedra that share corners with three equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(7)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with two equivalent Co(6)O6 octahedra. The Sb(1)-O(1) bond length is 2.01 Å. The Sb(1)-O(10) bond length is 1.99 Å. The Sb(1)-O(11) bond length is 1.99 Å. The Sb(1)-O(12) bond length is 2.00 Å. The Sb(1)-O(2) bond length is 2.10 Å. The Sb(1)-O(6) bond length is 2.11 Å. In the second Sb site, Sb(2) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share  a cornercorner with one Co(7)O4 tetrahedra, corners with two equivalent Co(3)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(5)O6 octahedra. The Sb(2)-O(2) bond length is 2.10 Å. The Sb(2)-O(3) bond length is 2.00 Å. The Sb(2)-O(4) bond length is 1.99 Å. The Sb(2)-O(6) bond length is 2.11 Å. The Sb(2)-O(7) bond length is 1.99 Å. The Sb(2)-O(8) bond length is 2.00 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Co(2), one Co(3), one Co(5), and one Sb(1) atom to form distorted OCo3Sb trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(6)Co2Sb2 trigonal pyramid. In the second O site, O(2) is bonded to one Co(2), one Co(3), one Sb(1), and one Sb(2) atom to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(6)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(1)Co3Sb trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(5), one Co(7), and one Sb(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(5) atom. In the sixth O site, O(6) is bonded to one Co(3), one Co(5), one Sb(1), and one Sb(2) atom to form distorted OCo2Sb2 trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid,  a cornercorner with one O(9)Co4 trigonal pyramid,  an edgeedge with one O(2)Co2Sb2 trigonal pyramid, and  an edgeedge with one O(1)Co3Sb trigonal pyramid. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(4), one Co(5), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(5), and one Sb(2) atom. In the ninth O site, O(9) is bonded to one Co(3), one Co(8), and two equivalent Co(6) atoms to form distorted OCo4 trigonal pyramids that share  a cornercorner with one O(2)Co2Sb2 trigonal pyramid,  a cornercorner with one O(6)Co2Sb2 trigonal pyramid,  a cornercorner with one O(1)Co3Sb trigonal pyramid, and corners with three equivalent O(9)Co4 trigonal pyramids. In the tenth O site, O(10) is bonded in a rectangular see-saw-like geometry to one Co(7), two equivalent Co(6), and one Sb(1) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Co(6), one Co(7), one Co(8), and one Sb(1) atom. In the twelfth O site, O(12) is bonded in a rectangular see-saw-like geometry to one Co(6), one Co(7), one Co(8), and one Sb(1) atom.