BaTeW2O9 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(9), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent W sites. In the first W site, W(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 corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. In the second W site, W(2) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. Te(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to two equivalent Ba(1) and one W(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ba(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one W(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(1), one W(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one W(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Te(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ba(1), one W(2), and one Te(1) atom.
BaTeW2O9 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(9), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms. The Ba(1)-O(2) bond length is 2.80 Å. The Ba(1)-O(3) bond length is 2.87 Å. The Ba(1)-O(9) bond length is 2.94 Å. There is one shorter (2.74 Å) and one longer (3.17 Å) Ba(1)-O(1) bond length. There is one shorter (2.81 Å) and one longer (3.11 Å) Ba(1)-O(4) bond length. There is one shorter (2.89 Å) and one longer (2.96 Å) Ba(1)-O(7) bond length. There are two inequivalent W sites. In the first W site, W(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 corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. The W(1)-O(1) bond length is 1.80 Å. The W(1)-O(2) bond length is 1.79 Å. The W(1)-O(3) bond length is 2.10 Å. The W(1)-O(5) bond length is 2.13 Å. The W(1)-O(6) bond length is 1.94 Å. The W(1)-O(8) bond length is 2.14 Å. In the second W site, W(2) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. The W(2)-O(4) bond length is 1.79 Å. The W(2)-O(5) bond length is 2.20 Å. The W(2)-O(6) bond length is 1.98 Å. The W(2)-O(7) bond length is 1.81 Å. The W(2)-O(8) bond length is 2.23 Å. The W(2)-O(9) bond length is 1.96 Å. Te(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), one O(8), and one O(9) atom. The Te(1)-O(3) bond length is 1.91 Å. The Te(1)-O(5) bond length is 2.14 Å. The Te(1)-O(8) bond length is 1.98 Å. The Te(1)-O(9) bond length is 2.08 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to two equivalent Ba(1) and one W(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ba(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one W(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(1), one W(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one W(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Te(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ba(1), one W(2), and one Te(1) atom.