Nd(Mg4Al3)4 crystallizes in the cubic I-43m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to three equivalent Mg(2), one Nd(1), and six equivalent Al(1) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to one Mg(1), six equivalent Mg(2), and five equivalent Al(1) atoms. Nd(1) is bonded in a 16-coordinate geometry to four equivalent Mg(1) and twelve equivalent Al(1) atoms. Al(1) is bonded in a 11-coordinate geometry to two equivalent Mg(1), five equivalent Mg(2), one Nd(1), and three equivalent Al(1) atoms.
Nd(Mg4Al3)4 crystallizes in the cubic I-43m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to three equivalent Mg(2), one Nd(1), and six equivalent Al(1) atoms. All Mg(1)-Mg(2) bond lengths are 3.02 Å. The Mg(1)-Nd(1) bond length is 3.31 Å. All Mg(1)-Al(1) bond lengths are 3.20 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to one Mg(1), six equivalent Mg(2), and five equivalent Al(1) atoms. There are two shorter (3.10 Å) and four longer (3.17 Å) Mg(2)-Mg(2) bond lengths. There are a spread of Mg(2)-Al(1) bond distances ranging from 2.84-3.17 Å. Nd(1) is bonded in a 16-coordinate geometry to four equivalent Mg(1) and twelve equivalent Al(1) atoms. All Nd(1)-Al(1) bond lengths are 3.25 Å. Al(1) is bonded in a 11-coordinate geometry to two equivalent Mg(1), five equivalent Mg(2), one Nd(1), and three equivalent Al(1) atoms. There is one shorter (2.73 Å) and two longer (2.80 Å) Al(1)-Al(1) bond lengths.