Sm4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Sm(1), three equivalent Sm(2), and three equivalent Sm(3) atoms to form a mixture of corner and face-sharing MgSm9Mg3 cuboctahedra. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Sm(3), and three equivalent Ni(1) atoms. In the second Sm site, Sm(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1), four equivalent Sm(3), and two equivalent Ni(1) atoms. In the third Sm site, Sm(3) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Sm(1), four equivalent Sm(2), four equivalent Sm(3), and two equivalent Ni(1) atoms. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Sm(3) atoms.
Sm4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Sm(1), three equivalent Sm(2), and three equivalent Sm(3) atoms to form a mixture of corner and face-sharing MgSm9Mg3 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.09 Å. All Mg(1)-Sm(1) bond lengths are 3.55 Å. All Mg(1)-Sm(2) bond lengths are 3.57 Å. All Mg(1)-Sm(3) bond lengths are 3.35 Å. There are three inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Sm(3), and three equivalent Ni(1) atoms. All Sm(1)-Sm(3) bond lengths are 3.55 Å. All Sm(1)-Ni(1) bond lengths are 2.83 Å. In the second Sm site, Sm(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1), four equivalent Sm(3), and two equivalent Ni(1) atoms. All Sm(2)-Sm(3) bond lengths are 3.67 Å. Both Sm(2)-Ni(1) bond lengths are 2.85 Å. In the third Sm site, Sm(3) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Sm(1), four equivalent Sm(2), four equivalent Sm(3), and two equivalent Ni(1) atoms. All Sm(3)-Sm(3) bond lengths are 3.64 Å. Both Sm(3)-Ni(1) bond lengths are 3.55 Å. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), and three equivalent Sm(3) atoms.