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GdAl 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 Al atoms. All Gd–Al bond lengths are 3.15 Å. Al is bonded in a body-centered cubic geometry to eight equivalent Gd atoms.
GdAl2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Gd is bonded in a 12-coordinate geometry to four equivalent Gd and twelve equivalent Al atoms. All Gd–Gd bond lengths are 3.43 Å. All Gd–Al bond lengths are 3.28 Å. Al is bonded to six equivalent Gd and six equivalent Al atoms to form a mixture of corner, edge, and face-sharing AlGd6Al6 cuboctahedra. All Al–Al bond lengths are 2.80 Å.
GdAl3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Gd is bonded to twelve equivalent Al atoms to form a mixture of distorted face and corner-sharing GdAl12 cuboctahedra. There are six shorter (3.10 Å) and six longer (3.18 Å) Gd–Al bond lengths. Al is bonded in a 10-coordinate geometry to four equivalent Gd and six equivalent Al atoms. There are two shorter (2.77 Å) and four longer (2.82 Å) Al–Al bond lengths.
Gd3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded to eight equivalent Gd and four equivalent Al atoms to form distorted GdGd8Al4 cuboctahedra that share corners with twelve equivalent GdGd8Al4 cuboctahedra, edges with eight equivalent AlGd12 cuboctahedra, edges with sixteen equivalent GdGd8Al4 cuboctahedra, faces with four equivalent AlGd12 cuboctahedra, and faces with fourteen equivalent GdGd8Al4 cuboctahedra. All Gd–Gd bond lengths are 3.40 Å. All Gd–Al bond lengths are 3.40 Å. Al is bonded to twelve equivalent Gd atoms to form AlGd12 cuboctahedra that share corners with twelve equivalent AlGd12 cuboctahedra, edges with twenty-four equivalent GdGd8Al4 cuboctahedra, faces with six equivalent AlGd12 cuboctahedra, and faces with twelve equivalent GdGd8Al4 cuboctahedra.