Tb2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(4) atoms. In the third Tb site, Tb(3) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. W(1) is bonded in a distorted trigonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Tb(3) and one W(1) atom. In the second O site, O(1) is bonded to two equivalent Tb(1) and two equivalent Tb(3) atoms to form OTb4 tetrahedra that share corners with two equivalent O(1)Tb4 tetrahedra, corners with four equivalent O(3)Tb3W tetrahedra,  an edgeedge with one O(3)Tb3W tetrahedra, and edges with three equivalent O(1)Tb4 tetrahedra. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Tb(3) and one W(1) atom. In the fourth O site, O(3) is bonded to one Tb(1), one Tb(2), one Tb(3), and one W(1) atom to form OTb3W tetrahedra that share corners with two equivalent O(3)Tb3W tetrahedra, corners with four equivalent O(1)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(2) and one W(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), and one W(1) atom.
Tb2WO6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. Both Tb(1)-O(3) bond lengths are 2.36 Å. Both Tb(1)-O(5) bond lengths are 2.79 Å. There are two shorter (2.23 Å) and two longer (2.39 Å) Tb(1)-O(1) bond lengths. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(4) atoms. Both Tb(2)-O(3) bond lengths are 2.29 Å. Both Tb(2)-O(5) bond lengths are 2.40 Å. There are two shorter (2.40 Å) and two longer (2.48 Å) Tb(2)-O(4) bond lengths. In the third Tb site, Tb(3) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. The Tb(3)-O(3) bond length is 2.34 Å. The Tb(3)-O(5) bond length is 2.66 Å. There is one shorter (2.21 Å) and one longer (2.30 Å) Tb(3)-O(1) bond length. There is one shorter (2.42 Å) and one longer (2.48 Å) Tb(3)-O(2) bond length. There is one shorter (2.41 Å) and one longer (2.57 Å) Tb(3)-O(6) bond length. W(1) is bonded in a distorted trigonal bipyramidal geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The W(1)-O(2) bond length is 1.89 Å. The W(1)-O(3) bond length is 2.12 Å. The W(1)-O(4) bond length is 1.83 Å. The W(1)-O(5) bond length is 1.87 Å. The W(1)-O(6) bond length is 1.86 Å. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Tb(3) and one W(1) atom. In the second O site, O(1) is bonded to two equivalent Tb(1) and two equivalent Tb(3) atoms to form OTb4 tetrahedra that share corners with two equivalent O(1)Tb4 tetrahedra, corners with four equivalent O(3)Tb3W tetrahedra,  an edgeedge with one O(3)Tb3W tetrahedra, and edges with three equivalent O(1)Tb4 tetrahedra. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Tb(3) and one W(1) atom. In the fourth O site, O(3) is bonded to one Tb(1), one Tb(2), one Tb(3), and one W(1) atom to form OTb3W tetrahedra that share corners with two equivalent O(3)Tb3W tetrahedra, corners with four equivalent O(1)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(2) and one W(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), and one W(1) atom.