W5Al2O16 crystallizes in the tetragonal I4/mmm space group. There are three inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra are not tilted. In the second W site, W(2) is bonded to one O(1), one O(2), and four equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. In the third W site, W(3) is bonded in a 6-coordinate geometry to one O(2), one O(3), and four equivalent O(6) atoms. Al(1) is bonded to two equivalent O(6) and four equivalent O(3) atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 9°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a linear geometry to one W(2) and one W(3) atom. In the third O site, O(3) is bonded in a distorted square co-planar geometry to one W(3) and four equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent W(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent W(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent W(3) and one Al(1) atom.
W5Al2O16 crystallizes in the tetragonal I4/mmm space group. There are three inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra are not tilted. Both W(1)-O(1) bond lengths are 1.98 Å. All W(1)-O(4) bond lengths are 1.95 Å. In the second W site, W(2) is bonded to one O(1), one O(2), and four equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. The W(2)-O(1) bond length is 1.83 Å. The W(2)-O(2) bond length is 2.15 Å. All W(2)-O(5) bond lengths are 1.95 Å. In the third W site, W(3) is bonded in a 6-coordinate geometry to one O(2), one O(3), and four equivalent O(6) atoms. The W(3)-O(2) bond length is 1.82 Å. The W(3)-O(3) bond length is 2.39 Å. All W(3)-O(6) bond lengths are 2.06 Å. Al(1) is bonded to two equivalent O(6) and four equivalent O(3) atoms to form a mixture of edge and corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 9°. Both Al(1)-O(6) bond lengths are 1.86 Å. All Al(1)-O(3) bond lengths are 1.95 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(2) atom. In the second O site, O(2) is bonded in a linear geometry to one W(2) and one W(3) atom. In the third O site, O(3) is bonded in a distorted square co-planar geometry to one W(3) and four equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent W(1) atoms. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent W(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent W(3) and one Al(1) atom.