Ba2YW2TlO7 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 5-coordinate geometry to one O(4) and four equivalent O(1) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. W(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing WO5 square pyramids. Tl(1) is bonded in a 6-coordinate geometry to two equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one W(1), and one Tl(1) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ba(1) atoms.
Ba2YW2TlO7 crystallizes in the orthorhombic Pmmm space group. Ba(1) is bonded in a 5-coordinate geometry to one O(4) and four equivalent O(1) atoms. The Ba(1)-O(4) bond length is 2.50 Å. All Ba(1)-O(1) bond lengths are 2.94 Å. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. All Y(1)-O(2) bond lengths are 2.58 Å. All Y(1)-O(3) bond lengths are 2.51 Å. W(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing WO5 square pyramids. The W(1)-O(1) bond length is 2.05 Å. Both W(1)-O(2) bond lengths are 2.03 Å. Both W(1)-O(3) bond lengths are 2.12 Å. Tl(1) is bonded in a 6-coordinate geometry to two equivalent O(1) atoms. Both Tl(1)-O(1) bond lengths are 2.86 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one W(1), and one Tl(1) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Ba(1) atoms.