TbAl crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Tb(1), four equivalent Tb(2), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of distorted edge, corner, and face-sharing AlTb8Al4 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to four equivalent Tb(1), four equivalent Tb(2), and two equivalent Al(1) atoms.
TbAl crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two shorter (3.33 Å) and two longer (3.38 Å) Tb(1)-Al(1) bond lengths. There are a spread of Tb(1)-Al(2) bond distances ranging from 3.07-3.25 Å. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two shorter (3.23 Å) and two longer (3.52 Å) Tb(2)-Al(1) bond lengths. There are a spread of Tb(2)-Al(2) bond distances ranging from 3.07-3.29 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Tb(1), four equivalent Tb(2), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of distorted edge, corner, and face-sharing AlTb8Al4 cuboctahedra. Both Al(1)-Al(1) bond lengths are 2.81 Å. Both Al(1)-Al(2) bond lengths are 2.72 Å. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to four equivalent Tb(1), four equivalent Tb(2), and two equivalent Al(1) atoms.