Gd2Tl crystallizes in the trigonal P-3m1 space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to three equivalent Gd(2), three equivalent Gd(3), and five equivalent Tl(1) atoms to form a mixture of distorted face and corner-sharing GdGd6Tl5 trigonal bipyramids. In the second Gd site, Gd(2) is bonded in a 14-coordinate geometry to two equivalent Gd(3), six equivalent Gd(1), and six equivalent Tl(1) atoms. In the third Gd site, Gd(3) is bonded in a 14-coordinate geometry to two equivalent Gd(2), six equivalent Gd(1), and six equivalent Tl(1) atoms. Tl(1) is bonded in a 11-coordinate geometry to three equivalent Gd(2), three equivalent Gd(3), and five equivalent Gd(1) atoms.
Gd2Tl crystallizes in the trigonal P-3m1 space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to three equivalent Gd(2), three equivalent Gd(3), and five equivalent Tl(1) atoms to form a mixture of distorted face and corner-sharing GdGd6Tl5 trigonal bipyramids. All Gd(1)-Gd(2) bond lengths are 3.57 Å. All Gd(1)-Gd(3) bond lengths are 3.58 Å. There are a spread of Gd(1)-Tl(1) bond distances ranging from 3.15-3.38 Å. In the second Gd site, Gd(2) is bonded in a 14-coordinate geometry to two equivalent Gd(3), six equivalent Gd(1), and six equivalent Tl(1) atoms. Both Gd(2)-Gd(3) bond lengths are 3.37 Å. All Gd(2)-Tl(1) bond lengths are 3.57 Å. In the third Gd site, Gd(3) is bonded in a 14-coordinate geometry to two equivalent Gd(2), six equivalent Gd(1), and six equivalent Tl(1) atoms. All Gd(3)-Tl(1) bond lengths are 3.57 Å. Tl(1) is bonded in a 11-coordinate geometry to three equivalent Gd(2), three equivalent Gd(3), and five equivalent Gd(1) atoms.