TbAl4 crystallizes in the orthorhombic Imma space group. Tb(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Tb(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Tb(1), two equivalent Al(3), and four equivalent Al(2) atoms. In the third Al site, Al(2) is bonded in a 13-coordinate geometry to three equivalent Tb(1), four equivalent Al(1), and six equivalent Al(3) atoms.
TbAl4 crystallizes in the orthorhombic Imma space group. Tb(1) is bonded in a 13-coordinate geometry to three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. There is one shorter (3.08 Å) and two longer (3.13 Å) Tb(1)-Al(2) bond lengths. All Tb(1)-Al(1) bond lengths are 3.11 Å. There are four shorter (3.08 Å) and two longer (3.14 Å) Tb(1)-Al(3) bond lengths. There are three inequivalent Al sites. In the first Al site, Al(3) is bonded in a 10-coordinate geometry to three equivalent Tb(1), one Al(1), three equivalent Al(2), and three equivalent Al(3) atoms. The Al(3)-Al(1) bond length is 2.71 Å. There are two shorter (2.83 Å) and one longer (2.89 Å) Al(3)-Al(2) bond length. There are two shorter (2.62 Å) and one longer (2.66 Å) Al(3)-Al(3) bond length. In the second Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Tb(1), two equivalent Al(3), and four equivalent Al(2) atoms. All Al(1)-Al(2) bond lengths are 3.12 Å. In the third Al site, Al(2) is bonded in a 13-coordinate geometry to three equivalent Tb(1), four equivalent Al(1), and six equivalent Al(3) atoms.