Mg24Er5 is alpha-derived structured and 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 12-coordinate geometry to three equivalent Mg(1), five equivalent Mg(2), one Er(2), and three equivalent Er(1) atoms. In the second Mg site, Mg(2) is bonded in a 13-coordinate geometry to five equivalent Mg(1), six equivalent Mg(2), and two equivalent Er(1) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to six equivalent Mg(2), nine equivalent Mg(1), and one Er(2) atom. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to twelve equivalent Mg(1) and four equivalent Er(1) atoms.
Mg24Er5 is alpha-derived structured and 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 12-coordinate geometry to three equivalent Mg(1), five equivalent Mg(2), one Er(2), and three equivalent Er(1) atoms. There is one shorter (2.83 Å) and two longer (3.01 Å) Mg(1)-Mg(1) bond lengths. There are a spread of Mg(1)-Mg(2) bond distances ranging from 2.95-3.39 Å. The Mg(1)-Er(2) bond length is 3.43 Å. There are two shorter (3.43 Å) and one longer (3.56 Å) Mg(1)-Er(1) bond length. In the second Mg site, Mg(2) is bonded in a 13-coordinate geometry to five equivalent Mg(1), six equivalent Mg(2), and two equivalent Er(1) atoms. There are two shorter (3.29 Å) and four longer (3.33 Å) Mg(2)-Mg(2) bond lengths. There is one shorter (3.21 Å) and one longer (3.63 Å) Mg(2)-Er(1) bond length. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to six equivalent Mg(2), nine equivalent Mg(1), and one Er(2) atom. The Er(1)-Er(2) bond length is 3.61 Å. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to twelve equivalent Mg(1) and four equivalent Er(1) atoms.