Lu4Co3 crystallizes in the trigonal P-3 space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 7-coordinate geometry to two equivalent Co(1) and five equivalent Co(2) atoms. In the second Lu site, Lu(2) is bonded in a 4-coordinate geometry to one Co(3) and three equivalent Co(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to six equivalent Lu(1) and three equivalent Co(2) atoms. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to three equivalent Lu(2), five equivalent Lu(1), and one Co(1) atom. In the third Co site, Co(3) is bonded in a 6-coordinate geometry to six equivalent Lu(2) atoms.
Lu4Co3 crystallizes in the trigonal P-3 space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 7-coordinate geometry to two equivalent Co(1) and five equivalent Co(2) atoms. Both Lu(1)-Co(1) bond lengths are 2.80 Å. There are a spread of Lu(1)-Co(2) bond distances ranging from 2.88-2.94 Å. In the second Lu site, Lu(2) is bonded in a 4-coordinate geometry to one Co(3) and three equivalent Co(2) atoms. The Lu(2)-Co(3) bond length is 2.76 Å. There are two shorter (2.71 Å) and one longer (2.98 Å) Lu(2)-Co(2) bond length. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to six equivalent Lu(1) and three equivalent Co(2) atoms. All Co(1)-Co(2) bond lengths are 2.26 Å. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to three equivalent Lu(2), five equivalent Lu(1), and one Co(1) atom. In the third Co site, Co(3) is bonded in a 6-coordinate geometry to six equivalent Lu(2) atoms.