Nb2Zn2SbO8 crystallizes in the triclinic P-1 space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form distorted NbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form distorted NbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-64°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(5), one O(7), and two equivalent O(8) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, corners with four equivalent Zn(2)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-78°. In the second Zn site, Zn(2) is bonded to one O(6), one O(8), and two equivalent O(7) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, corners with four equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-77°. Sb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Sb(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Nb(2) and two equivalent Sb(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Zn(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Zn(2) atom. In the seventh O site, O(7) is bonded to one Nb(2), one Zn(1), and two equivalent Zn(2) atoms to form a mixture of edge and corner-sharing ONbZn3 trigonal pyramids. In the eighth O site, O(8) is bonded to one Nb(1), one Zn(2), and two equivalent Zn(1) atoms to form a mixture of edge and corner-sharing ONbZn3 trigonal pyramids.
Nb2Zn2SbO8 crystallizes in the triclinic P-1 space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form distorted NbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-63°. The Nb(1)-O(1) bond length is 1.99 Å. The Nb(1)-O(2) bond length is 2.02 Å. The Nb(1)-O(3) bond length is 2.02 Å. The Nb(1)-O(5) bond length is 2.09 Å. The Nb(1)-O(6) bond length is 2.18 Å. The Nb(1)-O(8) bond length is 2.07 Å. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form distorted NbO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-64°. The Nb(2)-O(1) bond length is 2.03 Å. The Nb(2)-O(2) bond length is 1.98 Å. The Nb(2)-O(4) bond length is 1.98 Å. The Nb(2)-O(5) bond length is 2.18 Å. The Nb(2)-O(6) bond length is 2.09 Å. The Nb(2)-O(7) bond length is 2.06 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(5), one O(7), and two equivalent O(8) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Nb(2)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, corners with four equivalent Zn(2)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-78°. The Zn(1)-O(5) bond length is 1.98 Å. The Zn(1)-O(7) bond length is 1.98 Å. There is one shorter (2.05 Å) and one longer (2.11 Å) Zn(1)-O(8) bond length. In the second Zn site, Zn(2) is bonded to one O(6), one O(8), and two equivalent O(7) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra, corners with four equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-77°. The Zn(2)-O(6) bond length is 1.97 Å. The Zn(2)-O(8) bond length is 1.97 Å. There is one shorter (2.05 Å) and one longer (2.12 Å) Zn(2)-O(7) bond length. Sb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-64°. The Sb(1)-O(1) bond length is 2.49 Å. The Sb(1)-O(2) bond length is 2.47 Å. There is one shorter (2.18 Å) and one longer (2.22 Å) Sb(1)-O(3) bond length. There is one shorter (2.20 Å) and one longer (2.35 Å) Sb(1)-O(4) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Sb(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Nb(2) and two equivalent Sb(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Zn(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(1), one Nb(2), and one Zn(2) atom. In the seventh O site, O(7) is bonded to one Nb(2), one Zn(1), and two equivalent Zn(2) atoms to form a mixture of edge and corner-sharing ONbZn3 trigonal pyramids. In the eighth O site, O(8) is bonded to one Nb(1), one Zn(2), and two equivalent Zn(1) atoms to form a mixture of edge and corner-sharing ONbZn3 trigonal pyramids.