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TbCo2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Tb is bonded in a 12-coordinate geometry to twelve equivalent Co atoms. All Tb–Co bond lengths are 2.98 Å. Co is bonded to six equivalent Tb and six equivalent Co atoms to form a mixture of corner, edge, and face-sharing CoTb6Co6 cuboctahedra. All Co–Co bond lengths are 2.54 Å.
Tb12Co7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are six inequivalent Tb sites. In the first Tb site, Tb is bonded in a 5-coordinate geometry to five Co atoms. There are a spread of Tb–Co bond distances ranging from 2.87–3.10 Å. In the second Tb site, Tb is bonded in a 4-coordinate geometry to four Co atoms. There are a spread of Tb–Co bond distances ranging from 2.75–3.01 Å. In the third Tb site, Tb is bonded in a 4-coordinate geometry to four Co atoms. There are a spread of Tb–Co bond distances ranging from 2.79–3.07 Å. In the fourth Tb site, Tb is bonded in a 4-coordinate geometry to five Co atoms. There are a spread of Tb–Co bond distances ranging from 2.83–3.41 Å. In the fifth Tb site, Tb is bonded to four Co atoms to form distorted corner-sharing TbCo4 tetrahedra. There are a spread of Tb–Co bond distances ranging from 2.75–3.01 Å. In the sixth Tb site, Tb is bonded in a 5-coordinate geometry to five Co atoms. There are a spread of Tb–Co bond distances ranging from 2.75–3.19 Å. There are four inequivalent Co sites. In the first Co site, Co is bonded in a 9-coordinate geometry to eight Tb and one Co atom. The Co–Co bond length is 2.29 Å. In the second Co site, Co is bonded in a body-centered cubic geometry to eight Tb atoms. In the third Co site, Co is bonded in a 10-coordinate geometry to seven Tb and one Co atom. In the fourth Co site, Co is bonded in a 8-coordinate geometry to eight Tb atoms.
Tb4Co3 crystallizes in the trigonal P-3 space group. The structure is three-dimensional. there are two inequivalent Tb sites. In the first Tb site, Tb is bonded in a 7-coordinate geometry to seven Co atoms. There are a spread of Tb–Co bond distances ranging from 2.87–3.02 Å. In the second Tb site, Tb is bonded in a 4-coordinate geometry to four Co atoms. There are a spread of Tb–Co bond distances ranging from 2.79–3.07 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded in a 9-coordinate geometry to six equivalent Tb and three equivalent Co atoms. All Co–Co bond lengths are 2.34 Å. In the second Co site, Co is bonded in a 9-coordinate geometry to eight Tb and one Co atom. In the third Co site, Co is bonded in a 6-coordinate geometry to six equivalent Tb atoms.