Tb5Ge3C crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. In the second Tb site, Tb(2) is bonded in a 2-coordinate geometry to five equivalent Ge(1) and two equivalent C(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1) and five equivalent Tb(2) atoms. C(1) is bonded to six equivalent Tb(2) atoms to form face-sharing CTb6 octahedra.
Tb5Ge3C crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 6-coordinate geometry to six equivalent Ge(1) atoms. All Tb(1)-Ge(1) bond lengths are 3.06 Å. In the second Tb site, Tb(2) is bonded in a 2-coordinate geometry to five equivalent Ge(1) and two equivalent C(1) atoms. There are a spread of Tb(2)-Ge(1) bond distances ranging from 3.03-3.62 Å. Both Tb(2)-C(1) bond lengths are 2.50 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1) and five equivalent Tb(2) atoms. C(1) is bonded to six equivalent Tb(2) atoms to form face-sharing CTb6 octahedra.