SmCo2Zn is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to nine equivalent Co(1) and three equivalent Zn(3) atoms. In the second Sm site, Sm(2) is bonded in a 18-coordinate geometry to twelve equivalent Co(1), three equivalent Zn(1), and three equivalent Zn(2) atoms. Co(1) is bonded to two equivalent Sm(2), three equivalent Sm(1), four equivalent Co(1), one Zn(1), one Zn(2), and one Zn(3) atom to form distorted CoSm5Zn3Co4 cuboctahedra that share corners with two equivalent Zn(3)Sm6Co6 cuboctahedra, corners with fifteen equivalent Co(1)Sm5Zn3Co4 cuboctahedra, edges with eight equivalent Co(1)Sm5Zn3Co4 cuboctahedra, faces with three equivalent Zn(3)Sm6Co6 cuboctahedra, and faces with eleven equivalent Co(1)Sm5Zn3Co4 cuboctahedra. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 9-coordinate geometry to three equivalent Sm(2) and six equivalent Co(1) atoms. In the second Zn site, Zn(2) is bonded in a 9-coordinate geometry to three equivalent Sm(2) and six equivalent Co(1) atoms. In the third Zn site, Zn(3) is bonded to six equivalent Sm(1) and six equivalent Co(1) atoms to form ZnSm6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Sm5Zn3Co4 cuboctahedra, edges with six equivalent Zn(3)Sm6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Sm5Zn3Co4 cuboctahedra.
SmCo2Zn is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to nine equivalent Co(1) and three equivalent Zn(3) atoms. There are six shorter (2.93 Å) and three longer (3.21 Å) Sm(1)-Co(1) bond lengths. All Sm(1)-Zn(3) bond lengths are 3.06 Å. In the second Sm site, Sm(2) is bonded in a 18-coordinate geometry to twelve equivalent Co(1), three equivalent Zn(1), and three equivalent Zn(2) atoms. All Sm(2)-Co(1) bond lengths are 3.29 Å. All Sm(2)-Zn(1) bond lengths are 2.98 Å. All Sm(2)-Zn(2) bond lengths are 2.98 Å. Co(1) is bonded to two equivalent Sm(2), three equivalent Sm(1), four equivalent Co(1), one Zn(1), one Zn(2), and one Zn(3) atom to form distorted CoSm5Zn3Co4 cuboctahedra that share corners with two equivalent Zn(3)Sm6Co6 cuboctahedra, corners with fifteen equivalent Co(1)Sm5Zn3Co4 cuboctahedra, edges with eight equivalent Co(1)Sm5Zn3Co4 cuboctahedra, faces with three equivalent Zn(3)Sm6Co6 cuboctahedra, and faces with eleven equivalent Co(1)Sm5Zn3Co4 cuboctahedra. There are two shorter (2.56 Å) and two longer (2.59 Å) Co(1)-Co(1) bond lengths. The Co(1)-Zn(1) bond length is 2.53 Å. The Co(1)-Zn(2) bond length is 2.52 Å. The Co(1)-Zn(3) bond length is 2.60 Å. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 9-coordinate geometry to three equivalent Sm(2) and six equivalent Co(1) atoms. In the second Zn site, Zn(2) is bonded in a 9-coordinate geometry to three equivalent Sm(2) and six equivalent Co(1) atoms. In the third Zn site, Zn(3) is bonded to six equivalent Sm(1) and six equivalent Co(1) atoms to form ZnSm6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Sm5Zn3Co4 cuboctahedra, edges with six equivalent Zn(3)Sm6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Sm5Zn3Co4 cuboctahedra.