Sm2CuGa3 crystallizes in the trigonal P3m1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. In the second Sm site, Sm(2) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. Cu(1) is bonded in a 10-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Ga(3), and three equivalent Ga(1) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Cu(1) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Ga(3) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Cu(1), and three equivalent Ga(2) atoms.
Sm2CuGa3 crystallizes in the trigonal P3m1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. All Sm(1)-Cu(1) bond lengths are 2.96 Å. All Sm(1)-Ga(1) bond lengths are 3.15 Å. All Sm(1)-Ga(2) bond lengths are 3.43 Å. All Sm(1)-Ga(3) bond lengths are 3.04 Å. In the second Sm site, Sm(2) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. All Sm(2)-Cu(1) bond lengths are 3.21 Å. All Sm(2)-Ga(1) bond lengths are 3.01 Å. All Sm(2)-Ga(2) bond lengths are 3.02 Å. All Sm(2)-Ga(3) bond lengths are 3.42 Å. Cu(1) is bonded in a 10-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Ga(3), and three equivalent Ga(1) atoms. The Cu(1)-Ga(3) bond length is 3.22 Å. All Cu(1)-Ga(1) bond lengths are 2.55 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Cu(1) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Ga(3) atoms. All Ga(2)-Ga(3) bond lengths are 2.61 Å. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Cu(1), and three equivalent Ga(2) atoms.