Zn2Sb3O8 crystallizes in the monoclinic C2/m space group. Zn(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra and corners with six equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with six equivalent Zn(1)O4 tetrahedra and edges with four equivalent Sb(2)O6 octahedra. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with six equivalent Zn(1)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Sb(2) atoms. In the second O site, O(2) is bonded to one Zn(1), one Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge and corner-sharing OZnSb3 trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sb(1), and one Sb(2) atom.
Zn2Sb3O8 crystallizes in the monoclinic C2/m space group. Zn(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra and corners with six equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. The Zn(1)-O(1) bond length is 2.15 Å. The Zn(1)-O(2) bond length is 2.05 Å. Both Zn(1)-O(3) bond lengths are 1.99 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with six equivalent Zn(1)O4 tetrahedra and edges with four equivalent Sb(2)O6 octahedra. Both Sb(1)-O(2) bond lengths are 2.39 Å. All Sb(1)-O(3) bond lengths are 2.27 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with six equivalent Zn(1)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. Both Sb(2)-O(1) bond lengths are 2.08 Å. Both Sb(2)-O(2) bond lengths are 2.22 Å. Both Sb(2)-O(3) bond lengths are 2.02 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Sb(2) atoms. In the second O site, O(2) is bonded to one Zn(1), one Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge and corner-sharing OZnSb3 trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sb(1), and one Sb(2) atom.