Sm2Co5Ga2 crystallizes in the trigonal R-3m space group. There are six inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to six equivalent Co(2), six equivalent Co(3), three equivalent Ga(1), and three equivalent Ga(2) atoms. In the second Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. In the third Sm site, Sm(2) is bonded in a 12-coordinate geometry to three equivalent Co(1) and nine equivalent Co(3) atoms. In the fourth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. In the fifth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. In the sixth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six equivalent Co(2), six equivalent Co(3), three equivalent Ga(1), and three equivalent Ga(2) atoms. There are six inequivalent Co sites. In the first Co site, Co(2) is bonded to four Sm(1,1); four Co(2,2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra; corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra; edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra; edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra; faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra; and faces with eight Co(2,2)Sm4Ga4Co4 cuboctahedra. In the second Co site, Co(2) is bonded to four Sm(1,1); four equivalent Co(2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra, faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra, and faces with eight equivalent Co(2)Sm4Ga4Co4 cuboctahedra. In the third Co site, Co(2) is bonded to four Sm(1,1); four Co(2,2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra; corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra; edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra; edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra; faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra; and faces with eight Co(2,2)Sm4Ga4Co4 cuboctahedra. In the fourth Co site, Co(1) is bonded to six equivalent Sm(2) and six equivalent Co(3) atoms to form CoSm6Co6 cuboctahedra that share corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with six equivalent Co(1)Sm6Co6 cuboctahedra, and faces with eighteen equivalent Co(3)Sm5Ga2Co5 cuboctahedra. In the fifth Co site, Co(2) is bonded to four Sm(1,1); four equivalent Co(2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra, faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra, and faces with eight equivalent Co(2)Sm4Ga4Co4 cuboctahedra. In the sixth Co site, Co(3) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Co(1), four equivalent Co(3), one Ga(1), and one Ga(2) atom to form distorted CoSm5Ga2Co5 cuboctahedra that share corners with two equivalent Co(1)Sm6Co6 cuboctahedra, corners with six equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with nine equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with four equivalent Co(3)Sm5Ga2Co5 cuboctahedra,  a faceface with one Co(2)Sm4Ga4Co4 cuboctahedra, faces with three equivalent Co(1)Sm6Co6 cuboctahedra, and faces with ten equivalent Co(3)Sm5Ga2Co5 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1); three Co(2,2); and three equivalent Co(3) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Co(2), and three equivalent Co(3) atoms.
Sm2Co5Ga2 crystallizes in the trigonal R-3m space group. There are six inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to six equivalent Co(2), six equivalent Co(3), three equivalent Ga(1), and three equivalent Ga(2) atoms. All Sm(1)-Co(2) bond lengths are 3.14 Å. All Sm(1)-Co(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.04 Å. All Sm(1)-Ga(2) bond lengths are 3.04 Å. In the second Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. All Sm(1)-Co(2,2) bond lengths are 3.14 Å. All Sm(1)-Co(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.04 Å. All Sm(1)-Ga(2) bond lengths are 3.04 Å. In the third Sm site, Sm(2) is bonded in a 12-coordinate geometry to three equivalent Co(1) and nine equivalent Co(3) atoms. All Sm(2)-Co(1) bond lengths are 3.10 Å. There are six shorter (2.92 Å) and three longer (3.04 Å) Sm(2)-Co(3) bond lengths. In the fourth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. All Sm(1)-Co(2,2) bond lengths are 3.14 Å. All Sm(1)-Co(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.04 Å. All Sm(1)-Ga(2) bond lengths are 3.04 Å. In the fifth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six Co(2,2); six equivalent Co(3); three equivalent Ga(1); and three equivalent Ga(2) atoms. All Sm(1)-Co(2,2) bond lengths are 3.14 Å. All Sm(1)-Co(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.04 Å. All Sm(1)-Ga(2) bond lengths are 3.04 Å. In the sixth Sm site, Sm(1) is bonded in a 12-coordinate geometry to six equivalent Co(2), six equivalent Co(3), three equivalent Ga(1), and three equivalent Ga(2) atoms. All Sm(1)-Co(2) bond lengths are 3.14 Å. All Sm(1)-Co(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.04 Å. All Sm(1)-Ga(2) bond lengths are 3.04 Å. There are six inequivalent Co sites. In the first Co site, Co(2) is bonded to four Sm(1,1); four Co(2,2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra; corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra; edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra; edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra; faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra; and faces with eight Co(2,2)Sm4Ga4Co4 cuboctahedra. All Co(2)-Co(2,2) bond lengths are 2.62 Å. Both Co(2)-Ga(1) bond lengths are 2.46 Å. Both Co(2)-Ga(2) bond lengths are 2.44 Å. In the second Co site, Co(2) is bonded to four Sm(1,1); four equivalent Co(2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra, faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra, and faces with eight equivalent Co(2)Sm4Ga4Co4 cuboctahedra. Both Co(2)-Ga(1) bond lengths are 2.46 Å. Both Co(2)-Ga(2) bond lengths are 2.44 Å. In the third Co site, Co(2) is bonded to four Sm(1,1); four Co(2,2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra; corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra; edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra; edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra; faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra; and faces with eight Co(2,2)Sm4Ga4Co4 cuboctahedra. Both Co(2)-Sm(1) bond lengths are 3.14 Å. All Co(2)-Co(2,2) bond lengths are 2.62 Å. Both Co(2)-Ga(1) bond lengths are 2.46 Å. Both Co(2)-Ga(2) bond lengths are 2.44 Å. In the fourth Co site, Co(1) is bonded to six equivalent Sm(2) and six equivalent Co(3) atoms to form CoSm6Co6 cuboctahedra that share corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with six equivalent Co(1)Sm6Co6 cuboctahedra, and faces with eighteen equivalent Co(3)Sm5Ga2Co5 cuboctahedra. All Co(1)-Co(3) bond lengths are 2.47 Å. In the fifth Co site, Co(2) is bonded to four Sm(1,1); four equivalent Co(2); two equivalent Ga(1); and two equivalent Ga(2) atoms to form distorted CoSm4Ga4Co4 cuboctahedra that share corners with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with twelve equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with two equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with eight equivalent Co(3)Sm5Ga2Co5 cuboctahedra, faces with two equivalent Co(3)Sm5Ga2Co5 cuboctahedra, and faces with eight equivalent Co(2)Sm4Ga4Co4 cuboctahedra. All Co(2)-Co(2) bond lengths are 2.62 Å. Both Co(2)-Ga(1) bond lengths are 2.46 Å. Both Co(2)-Ga(2) bond lengths are 2.44 Å. In the sixth Co site, Co(3) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Co(1), four equivalent Co(3), one Ga(1), and one Ga(2) atom to form distorted CoSm5Ga2Co5 cuboctahedra that share corners with two equivalent Co(1)Sm6Co6 cuboctahedra, corners with six equivalent Co(2)Sm4Ga4Co4 cuboctahedra, corners with nine equivalent Co(3)Sm5Ga2Co5 cuboctahedra, edges with four equivalent Co(2)Sm4Ga4Co4 cuboctahedra, edges with four equivalent Co(3)Sm5Ga2Co5 cuboctahedra,  a faceface with one Co(2)Sm4Ga4Co4 cuboctahedra, faces with three equivalent Co(1)Sm6Co6 cuboctahedra, and faces with ten equivalent Co(3)Sm5Ga2Co5 cuboctahedra. There are two shorter (2.61 Å) and two longer (2.64 Å) Co(3)-Co(3) bond lengths. The Co(3)-Ga(1) bond length is 2.47 Å. The Co(3)-Ga(2) bond length is 2.47 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1); three Co(2,2); and three equivalent Co(3) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Co(2), and three equivalent Co(3) atoms.