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GdCo2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Gd is bonded in a 12-coordinate geometry to twelve equivalent Co atoms. All Gd–Co bond lengths are 3.00 Å. Co is bonded to six equivalent Gd and six equivalent Co atoms to form a mixture of face, edge, and corner-sharing CoGd6Co6 cuboctahedra. All Co–Co bond lengths are 2.56 Å.
GdCo5 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Gd is bonded in a 6-coordinate geometry to eighteen Co atoms. There are a spread of Gd–Co bond distances ranging from 2.84–3.16 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded in a 12-coordinate geometry to three equivalent Gd and six Co atoms. There are four shorter (2.43 Å) and two longer (2.44 Å) Co–Co bond lengths. In the second Co site, Co is bonded to four equivalent Gd and eight Co atoms to form a mixture of face, edge, and corner-sharing CoGd4Co8 cuboctahedra. All Co–Co bond lengths are 2.47 Å. In the third Co site, Co is bonded to four equivalent Gd and eight Co atoms to form a mixture of face, edge, and corner-sharing CoGd4Co8 cuboctahedra. Both Co–Co bond lengths are 2.47 Å.
Gd2Co17 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Gd sites. In the first Gd site, Gd is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Gd–Co bond distances ranging from 2.95–3.27 Å. In the second Gd site, Gd is bonded in a 2-coordinate geometry to twenty Co atoms. There are a spread of Gd–Co bond distances ranging from 2.89–3.14 Å. There are eight inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to one Gd and thirteen Co atoms. There are a spread of Co–Co bond distances ranging from 2.33–2.66 Å. In the second Co site, Co is bonded to two equivalent Gd and ten Co atoms to form a mixture of corner, edge, and face-sharing CoGd2Co10 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.39–2.41 Å. In the third Co site, Co is bonded to two equivalent Gd and ten Co atoms to form a mixture of corner, edge, and face-sharing CoGd2Co10 cuboctahedra. There are four shorter (2.39 Å) and four longer (2.41 Å) Co–Co bond lengths. In the fourth Co site, Co is bonded to two Gd and ten Co atoms to form a mixture of distorted corner, edge, and face-sharing CoGd2Co10 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.34–2.56 Å. In the fifth Co site, Co is bonded to two Gd and ten Co atoms to form a mixture of distorted corner, edge, and face-sharing CoGd2Co10 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.34–2.56 Å. In the sixth Co site, Co is bonded to two Gd and ten Co atoms to form a mixture of distorted corner, edge, and face-sharing CoGd2Co10 cuboctahedra. There are two shorter (2.52 Å) and two longer (2.56 Å) Co–Co bond lengths. In the seventh Co site, Co is bonded to three Gd and nine Co atoms to form a mixture of distorted corner, edge, and face-sharing CoGd3Co9 cuboctahedra. Both Co–Co bond lengths are 2.43 Å. In the eighth Co site, Co is bonded to three Gd and nine Co atoms to form a mixture of distorted corner, edge, and face-sharing CoGd3Co9 cuboctahedra.
Gd4Co3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are six inequivalent Gd sites. In the first Gd site, Gd is bonded in a 7-coordinate geometry to seven Co atoms. There are a spread of Gd–Co bond distances ranging from 2.86–3.04 Å. In the second Gd site, Gd is bonded in a 7-coordinate geometry to seven Co atoms. There are a spread of Gd–Co bond distances ranging from 2.86–3.06 Å. In the third Gd site, Gd is bonded in a 7-coordinate geometry to seven Co atoms. There are a spread of Gd–Co bond distances ranging from 2.86–3.04 Å. In the fourth Gd site, Gd is bonded to four Co atoms to form a mixture of distorted edge and corner-sharing GdCo4 tetrahedra. There are a spread of Gd–Co bond distances ranging from 2.82–3.03 Å. In the fifth Gd site, Gd is bonded to four Co atoms to form a mixture of distorted edge and corner-sharing GdCo4 tetrahedra. There are a spread of Gd–Co bond distances ranging from 2.82–3.03 Å. In the sixth Gd site, Gd is bonded to four Co atoms to form a mixture of distorted edge and corner-sharing GdCo4 tetrahedra. There are a spread of Gd–Co bond distances ranging from 2.81–3.01 Å. There are five inequivalent Co sites. In the first Co site, Co is bonded in a 9-coordinate geometry to eight Gd and one Co atom. The Co–Co bond length is 2.38 Å. In the second Co site, Co is bonded in a 9-coordinate geometry to eight Gd and one Co atom. The Co–Co bond length is 2.37 Å. In the third Co site, Co is bonded in a 9-coordinate geometry to eight Gd and one Co atom. The Co–Co bond length is 2.38 Å. In the fourth Co site, Co is bonded in a 9-coordinate geometry to six Gd and three Co atoms. In the fifth Co site, Co is bonded in a 6-coordinate geometry to six Gd atoms.