DyCoGa5 crystallizes in the tetragonal P4/mmm space group. Dy(1) is bonded to four equivalent Ga(1) and eight equivalent Ga(2) atoms to form DyGa12 cuboctahedra that share corners with four equivalent Dy(1)Ga12 cuboctahedra, faces with four equivalent Dy(1)Ga12 cuboctahedra, and faces with four equivalent Ga(1)Dy4Ga8 cuboctahedra. Co(1) is bonded in a body-centered cubic geometry to eight equivalent Ga(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Dy(1) and eight equivalent Ga(2) atoms to form distorted GaDy4Ga8 cuboctahedra that share corners with four equivalent Ga(1)Dy4Ga8 cuboctahedra, faces with four equivalent Dy(1)Ga12 cuboctahedra, and faces with four equivalent Ga(1)Dy4Ga8 cuboctahedra. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to two equivalent Dy(1), two equivalent Co(1), two equivalent Ga(1), and five equivalent Ga(2) atoms.
DyCoGa5 crystallizes in the tetragonal P4/mmm space group. Dy(1) is bonded to four equivalent Ga(1) and eight equivalent Ga(2) atoms to form DyGa12 cuboctahedra that share corners with four equivalent Dy(1)Ga12 cuboctahedra, faces with four equivalent Dy(1)Ga12 cuboctahedra, and faces with four equivalent Ga(1)Dy4Ga8 cuboctahedra. All Dy(1)-Ga(1) bond lengths are 2.95 Å. All Dy(1)-Ga(2) bond lengths are 2.96 Å. Co(1) is bonded in a body-centered cubic geometry to eight equivalent Ga(2) atoms. All Co(1)-Ga(2) bond lengths are 2.44 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Dy(1) and eight equivalent Ga(2) atoms to form distorted GaDy4Ga8 cuboctahedra that share corners with four equivalent Ga(1)Dy4Ga8 cuboctahedra, faces with four equivalent Dy(1)Ga12 cuboctahedra, and faces with four equivalent Ga(1)Dy4Ga8 cuboctahedra. All Ga(1)-Ga(2) bond lengths are 2.96 Å. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to two equivalent Dy(1), two equivalent Co(1), two equivalent Ga(1), and five equivalent Ga(2) atoms. There is one shorter (2.55 Å) and four longer (2.95 Å) Ga(2)-Ga(2) bond lengths.