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GdTl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Gd–Tl bond lengths are 3.34 Å. Tl is bonded in a body-centered cubic geometry to eight equivalent Gd atoms.
GdTl(WO4)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Gd3+ is bonded in a 6-coordinate geometry to eight O2- atoms. There are a spread of Gd–O bond distances ranging from 2.33–2.84 Å. W6+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of W–O bond distances ranging from 1.84–2.16 Å. Tl1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Tl–O bond distances ranging from 2.92–3.17 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent W6+ and two equivalent Tl1+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Gd3+, one W6+, and one Tl1+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+, two equivalent W6+, and one Tl1+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Gd3+, one W6+, and one Tl1+ atom.