Tb4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms to form a mixture of corner and face-sharing MgTb9Mg3 cuboctahedra. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Tb(3), four equivalent Tb(1), four equivalent Tb(2), and two equivalent Ni(1) atoms. In the second Tb site, Tb(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(1), four equivalent Tb(1), and two equivalent Ni(1) atoms. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Tb(1), and three equivalent Ni(1) atoms. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms.
Tb4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms to form a mixture of corner and face-sharing MgTb9Mg3 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.05 Å. All Mg(1)-Tb(1) bond lengths are 3.30 Å. All Mg(1)-Tb(2) bond lengths are 3.52 Å. All Mg(1)-Tb(3) bond lengths are 3.49 Å. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Tb(3), four equivalent Tb(1), four equivalent Tb(2), and two equivalent Ni(1) atoms. Both Tb(1)-Tb(3) bond lengths are 3.50 Å. All Tb(1)-Tb(1) bond lengths are 3.57 Å. All Tb(1)-Tb(2) bond lengths are 3.62 Å. Both Tb(1)-Ni(1) bond lengths are 3.50 Å. In the second Tb site, Tb(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(1), four equivalent Tb(1), and two equivalent Ni(1) atoms. Both Tb(2)-Ni(1) bond lengths are 2.80 Å. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Tb(1), and three equivalent Ni(1) atoms. All Tb(3)-Ni(1) bond lengths are 2.79 Å. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms.