MgTb4Rh 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 3-coordinate geometry to three equivalent Mg(1) and three equivalent Rh(1) atoms. In the second Tb site, Tb(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1) and two equivalent Rh(1) atoms. In the third Tb site, Tb(3) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Rh(1) atoms. Rh(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms.
MgTb4Rh 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 3.07 Å. All Mg(1)-Tb(1) bond lengths are 3.51 Å. All Mg(1)-Tb(2) bond lengths are 3.55 Å. All Mg(1)-Tb(3) bond lengths are 3.32 Å. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1) and three equivalent Rh(1) atoms. All Tb(1)-Rh(1) bond lengths are 2.82 Å. In the second Tb site, Tb(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1) and two equivalent Rh(1) atoms. Both Tb(2)-Rh(1) bond lengths are 2.82 Å. In the third Tb site, Tb(3) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Rh(1) atoms. Both Tb(3)-Rh(1) bond lengths are 3.52 Å. Rh(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms.