Sm2CoGa3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Co(1), two equivalent Ga(3), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted SmGa10Co2 cuboctahedra that share edges with four equivalent Sm(1)Ga10Co2 cuboctahedra, edges with eight equivalent Sm(2)Ga8Co4 cuboctahedra, faces with four equivalent Sm(1)Ga10Co2 cuboctahedra, and faces with four equivalent Sm(2)Ga8Co4 cuboctahedra. In the second Sm site, Sm(2) is bonded to four equivalent Co(1), two equivalent Ga(1), two equivalent Ga(2), and four equivalent Ga(3) atoms to form SmGa8Co4 cuboctahedra that share edges with four equivalent Sm(2)Ga8Co4 cuboctahedra, edges with eight equivalent Sm(1)Ga10Co2 cuboctahedra, faces with four equivalent Sm(1)Ga10Co2 cuboctahedra, and faces with four equivalent Sm(2)Ga8Co4 cuboctahedra. Co(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ga(3), and two equivalent Ga(2) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Ga(2), and two equivalent Ga(3) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Co(1), and one Ga(1) atom. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Co(1), and two equivalent Ga(1) atoms.
Sm2CoGa3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to two equivalent Co(1), two equivalent Ga(3), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted SmGa10Co2 cuboctahedra that share edges with four equivalent Sm(1)Ga10Co2 cuboctahedra, edges with eight equivalent Sm(2)Ga8Co4 cuboctahedra, faces with four equivalent Sm(1)Ga10Co2 cuboctahedra, and faces with four equivalent Sm(2)Ga8Co4 cuboctahedra. Both Sm(1)-Co(1) bond lengths are 3.01 Å. Both Sm(1)-Ga(3) bond lengths are 3.39 Å. All Sm(1)-Ga(1) bond lengths are 3.21 Å. All Sm(1)-Ga(2) bond lengths are 3.11 Å. In the second Sm site, Sm(2) is bonded to four equivalent Co(1), two equivalent Ga(1), two equivalent Ga(2), and four equivalent Ga(3) atoms to form SmGa8Co4 cuboctahedra that share edges with four equivalent Sm(2)Ga8Co4 cuboctahedra, edges with eight equivalent Sm(1)Ga10Co2 cuboctahedra, faces with four equivalent Sm(1)Ga10Co2 cuboctahedra, and faces with four equivalent Sm(2)Ga8Co4 cuboctahedra. All Sm(2)-Co(1) bond lengths are 3.12 Å. Both Sm(2)-Ga(1) bond lengths are 3.27 Å. Both Sm(2)-Ga(2) bond lengths are 3.04 Å. All Sm(2)-Ga(3) bond lengths are 3.15 Å. Co(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ga(3), and two equivalent Ga(2) atoms. The Co(1)-Ga(3) bond length is 2.48 Å. Both Co(1)-Ga(2) bond lengths are 2.44 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), one Ga(2), and two equivalent Ga(3) atoms. The Ga(1)-Ga(2) bond length is 2.58 Å. Both Ga(1)-Ga(3) bond lengths are 2.55 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Sm(2), four equivalent Sm(1), two equivalent Co(1), and one Ga(1) atom. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Co(1), and two equivalent Ga(1) atoms.