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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.
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.