Fe8CoZn3O16 is Spinel-derived structured and crystallizes in the tetragonal P-4m2 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), two equivalent O(4), and three equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Co(1)O4 tetrahedra; corners with five equivalent Zn(1,2)O4 tetrahedra; edges with two equivalent Fe(2)O6 octahedra; and edges with four equivalent Fe(1)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(4), two equivalent O(3), and three equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra; corners with four equivalent Zn(1,2)O4 tetrahedra; edges with two equivalent Fe(1)O6 octahedra; and edges with four equivalent Fe(2)O6 octahedra. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with eight equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. Zn(1,2) is bonded to four equivalent O(4) atoms to form ZnO4 tetrahedra that share corners with four equivalent Fe(2)O6 octahedra and corners with eight equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are four inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Fe(1) and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(1)ZnFe3 trigonal pyramid, corners with two equivalent O(2)ZnFe3 trigonal pyramids, corners with three equivalent O(3)Fe3Co trigonal pyramids, corners with six equivalent O(4)ZnFe3 trigonal pyramids, and edges with three equivalent O(1)ZnFe3 trigonal pyramids. In the second O site, O(2) is bonded to three equivalent Fe(2) and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(2)ZnFe3 trigonal pyramid, corners with two equivalent O(1)ZnFe3 trigonal pyramids, corners with three equivalent O(4)ZnFe3 trigonal pyramids, corners with six equivalent O(3)Fe3Co trigonal pyramids, and edges with three equivalent O(2)ZnFe3 trigonal pyramids. In the third O site, O(3) is bonded to one Fe(1), two equivalent Fe(2), and one Co(1) atom to form distorted OFe3Co trigonal pyramids that share corners with three equivalent O(3)Fe3Co trigonal pyramids, corners with three equivalent O(1)ZnFe3 trigonal pyramids, corners with six equivalent O(2)ZnFe3 trigonal pyramids,  an edgeedge with one O(3)Fe3Co trigonal pyramid, and edges with two equivalent O(4)ZnFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Fe(2); two equivalent Fe(1); and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share corners with three equivalent O(2)ZnFe3 trigonal pyramids, corners with three equivalent O(4)ZnFe3 trigonal pyramids, corners with six equivalent O(1)ZnFe3 trigonal pyramids,  an edgeedge with one O(4)ZnFe3 trigonal pyramid, and edges with two equivalent O(3)Fe3Co trigonal pyramids.
Fe8CoZn3O16 is Spinel-derived structured and crystallizes in the tetragonal P-4m2 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(3), two equivalent O(4), and three equivalent O(1) atoms to form FeO6 octahedra that share  a cornercorner with one Co(1)O4 tetrahedra; corners with five equivalent Zn(1,2)O4 tetrahedra; edges with two equivalent Fe(2)O6 octahedra; and edges with four equivalent Fe(1)O6 octahedra. The Fe(1)-O(3) bond length is 2.05 Å. Both Fe(1)-O(4) bond lengths are 2.05 Å. All Fe(1)-O(1) bond lengths are 2.05 Å. In the second Fe site, Fe(2) is bonded to one O(4), two equivalent O(3), and three equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Co(1)O4 tetrahedra; corners with four equivalent Zn(1,2)O4 tetrahedra; edges with two equivalent Fe(1)O6 octahedra; and edges with four equivalent Fe(2)O6 octahedra. The Fe(2)-O(4) bond length is 2.05 Å. Both Fe(2)-O(3) bond lengths are 2.05 Å. All Fe(2)-O(2) bond lengths are 2.05 Å. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with eight equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Co(1)-O(3) bond lengths are 2.01 Å. Zn(1,2) is bonded to four equivalent O(4) atoms to form ZnO4 tetrahedra that share corners with four equivalent Fe(2)O6 octahedra and corners with eight equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Zn(1,2)-O(4) bond lengths are 2.01 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Fe(1) and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(1)ZnFe3 trigonal pyramid, corners with two equivalent O(2)ZnFe3 trigonal pyramids, corners with three equivalent O(3)Fe3Co trigonal pyramids, corners with six equivalent O(4)ZnFe3 trigonal pyramids, and edges with three equivalent O(1)ZnFe3 trigonal pyramids. The O(1)-Zn(1,2) bond length is 2.00 Å. In the second O site, O(2) is bonded to three equivalent Fe(2) and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(2)ZnFe3 trigonal pyramid, corners with two equivalent O(1)ZnFe3 trigonal pyramids, corners with three equivalent O(4)ZnFe3 trigonal pyramids, corners with six equivalent O(3)Fe3Co trigonal pyramids, and edges with three equivalent O(2)ZnFe3 trigonal pyramids. The O(2)-Zn(1,2) bond length is 2.01 Å. In the third O site, O(3) is bonded to one Fe(1), two equivalent Fe(2), and one Co(1) atom to form distorted OFe3Co trigonal pyramids that share corners with three equivalent O(3)Fe3Co trigonal pyramids, corners with three equivalent O(1)ZnFe3 trigonal pyramids, corners with six equivalent O(2)ZnFe3 trigonal pyramids,  an edgeedge with one O(3)Fe3Co trigonal pyramid, and edges with two equivalent O(4)ZnFe3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Fe(2); two equivalent Fe(1); and one Zn(1,2) atom to form distorted OZnFe3 trigonal pyramids that share corners with three equivalent O(2)ZnFe3 trigonal pyramids, corners with three equivalent O(4)ZnFe3 trigonal pyramids, corners with six equivalent O(1)ZnFe3 trigonal pyramids,  an edgeedge with one O(4)ZnFe3 trigonal pyramid, and edges with two equivalent O(3)Fe3Co trigonal pyramids.