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YbCo2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Yb is bonded in a 12-coordinate geometry to twelve equivalent Co atoms. All Yb–Co bond lengths are 2.95 Å. Co is bonded to six equivalent Yb and six equivalent Co atoms to form a mixture of edge, corner, and face-sharing CoYb6Co6 cuboctahedra. All Co–Co bond lengths are 2.51 Å.
Yb2Co17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Yb sites. In the first Yb site, Yb is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Yb–Co bond distances ranging from 2.92–3.25 Å. In the second Yb site, Yb is bonded in a 2-coordinate geometry to twenty Co atoms. There are a spread of Yb–Co bond distances ranging from 2.88–3.12 Å. There are four inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to one Yb 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 Yb and ten Co atoms to form CoYb2Co10 cuboctahedra that share corners with fourteen CoYb2Co10 cuboctahedra, edges with six equivalent CoYb3Co9 cuboctahedra, and faces with ten CoYb2Co10 cuboctahedra. All Co–Co bond lengths are 2.39 Å. In the third Co site, Co is bonded in a 12-coordinate geometry to two Yb and ten Co atoms. There are a spread of Co–Co bond distances ranging from 2.33–2.52 Å. In the fourth Co site, Co is bonded to three Yb and nine Co atoms to form a mixture of distorted face, edge, and corner-sharing CoYb3Co9 cuboctahedra. Both Co–Co bond lengths are 2.41 Å.
YbCo3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Yb sites. In the first Yb site, Yb is bonded in a 12-coordinate geometry to twelve Co atoms. There are a spread of Yb–Co bond distances ranging from 2.88–3.01 Å. In the second Yb site, Yb is bonded in a 6-coordinate geometry to eighteen Co atoms. There are six shorter (2.87 Å) and twelve longer (3.17 Å) Yb–Co bond lengths. There are three inequivalent Co sites. In the first Co site, Co is bonded to five Yb and seven Co atoms to form a mixture of corner, edge, and face-sharing CoYb5Co7 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.42–2.50 Å. In the second Co site, Co is bonded in a 12-coordinate geometry to three equivalent Yb and six equivalent Co atoms. In the third Co site, Co is bonded to six equivalent Yb and six equivalent Co atoms to form CoYb6Co6 cuboctahedra that share corners with twelve equivalent CoYb5Co7 cuboctahedra, edges with six equivalent CoYb6Co6 cuboctahedra, and faces with eighteen equivalent CoYb5Co7 cuboctahedra.
Yb3Co is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Yb sites. In the first Yb site, Yb is bonded in a 2-coordinate geometry to three equivalent Co atoms. There are a spread of Yb–Co bond distances ranging from 2.82–3.29 Å. In the second Yb site, Yb is bonded in a bent 150 degrees geometry to two equivalent Co atoms. There are one shorter (2.75 Å) and one longer (2.80 Å) Yb–Co bond lengths. Co is bonded in a 6-coordinate geometry to eight Yb atoms.