TbCBi2 crystallizes in the tetragonal P4_2/mbc space group. Tb(1) is bonded in a 2-coordinate geometry to two equivalent C(1), two equivalent Bi(2), and four equivalent Bi(1) atoms. C(1) is bonded in a 6-coordinate geometry to two equivalent Tb(1) and four equivalent Bi(2) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to four equivalent Tb(1) and two equivalent Bi(1) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent Tb(1) and four equivalent C(1) atoms.
TbCBi2 crystallizes in the tetragonal P4_2/mbc space group. Tb(1) is bonded in a 2-coordinate geometry to two equivalent C(1), two equivalent Bi(2), and four equivalent Bi(1) atoms. Both Tb(1)-C(1) bond lengths are 2.83 Å. Both Tb(1)-Bi(2) bond lengths are 3.09 Å. There are two shorter (3.49 Å) and two longer (3.50 Å) Tb(1)-Bi(1) bond lengths. C(1) is bonded in a 6-coordinate geometry to two equivalent Tb(1) and four equivalent Bi(2) atoms. There are a spread of C(1)-Bi(2) bond distances ranging from 2.45-2.85 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to four equivalent Tb(1) and two equivalent Bi(1) atoms. Both Bi(1)-Bi(1) bond lengths are 2.83 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent Tb(1) and four equivalent C(1) atoms.