W3O7 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. In the second W site, W(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-21°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one W(2) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent W(2) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent W(1) atoms.
W3O7 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 10-21°. There is one shorter (1.93 Å) and one longer (1.95 Å) W(1)-O(3) bond length. There are two shorter (2.07 Å) and two longer (2.14 Å) W(1)-O(1) bond lengths. In the second W site, W(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 0-21°. There is one shorter (1.92 Å) and one longer (1.94 Å) W(2)-O(2) bond length. All W(2)-O(1) bond lengths are 2.07 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one W(2) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent W(2) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent W(1) atoms.