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TbCd2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Tb is bonded to twelve equivalent Cd atoms to form a mixture of distorted edge and face-sharing TbCd12 cuboctahedra. All Tb–Cd bond lengths are 3.36 Å. Cd is bonded in a 11-coordinate geometry to six equivalent Tb and five equivalent Cd atoms. There are three shorter (2.88 Å) and two longer (3.46 Å) Cd–Cd bond lengths.
TbCd3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Tb is bonded to twelve Cd atoms to form a mixture of corner and face-sharing TbCd12 cuboctahedra. There are six shorter (3.18 Å) and six longer (3.33 Å) Tb–Cd bond lengths. There are three inequivalent Cd sites. In the first Cd site, Cd is bonded in a 12-coordinate geometry to four equivalent Tb and eight Cd atoms. There are a spread of Cd–Cd bond distances ranging from 3.12–3.42 Å. In the second Cd site, Cd is bonded in a 12-coordinate geometry to four equivalent Tb and eight equivalent Cd atoms. In the third Cd site, Cd is bonded in a 12-coordinate geometry to four equivalent Tb and eight equivalent Cd atoms.
TbCd3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Tb is bonded in a 12-coordinate geometry to twelve Cd atoms. There are a spread of Tb–Cd bond distances ranging from 3.21–3.61 Å. There are two inequivalent Cd sites. In the first Cd site, Cd is bonded in a 11-coordinate geometry to four equivalent Tb and seven Cd atoms. There are a spread of Cd–Cd bond distances ranging from 3.03–3.35 Å. In the second Cd site, Cd is bonded in a 2-coordinate geometry to four equivalent Tb and eight equivalent Cd atoms.
TbCd is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tb is bonded in a body-centered cubic geometry to eight equivalent Cd atoms. All Tb–Cd bond lengths are 3.26 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent Tb atoms.