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TbC2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb4+ is bonded in a distorted q4 geometry to ten equivalent C2- atoms. There are two shorter (2.47 Å) and eight longer (2.69 Å) Tb–C bond lengths. C2- is bonded in a 6-coordinate geometry to five equivalent Tb4+ and one C2- atom. The C–C bond length is 1.30 Å.
Tb2C is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Tb2C sheets oriented in the (0, 0, 1) direction. Tb is bonded in a distorted T-shaped geometry to three equivalent C atoms. All Tb–C bond lengths are 2.49 Å. C is bonded to six equivalent Tb atoms to form edge-sharing CTb6 octahedra.
Tb2C3 is Plutonium carbide structured and crystallizes in the cubic I-43d space group. The structure is three-dimensional. Tb3+ is bonded in a 9-coordinate geometry to nine equivalent C2- atoms. There are a spread of Tb–C bond distances ranging from 2.53–2.84 Å. C2- is bonded to six equivalent Tb3+ and one C2- atom to form a mixture of distorted corner, edge, and face-sharing CTb6C trigonal bipyramids. The C–C bond length is 1.34 Å.