Tm5Mg24 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 Tm(2), and three equivalent Tm(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 Tm(1) atoms. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 16-coordinate geometry to six equivalent Mg(2), nine equivalent Mg(1), and one Tm(2) atom. In the second Tm site, Tm(2) is bonded in a 16-coordinate geometry to twelve equivalent Mg(1) and four equivalent Tm(1) atoms.
Tm5Mg24 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 Tm(2), and three equivalent Tm(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 2.96-3.37 Å. The Mg(1)-Tm(2) bond length is 3.43 Å. There are two shorter (3.42 Å) and one longer (3.56 Å) Mg(1)-Tm(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 Tm(1) atoms. There are two shorter (3.28 Å) and four longer (3.33 Å) Mg(2)-Mg(2) bond lengths. There is one shorter (3.19 Å) and one longer (3.65 Å) Mg(2)-Tm(1) bond length. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 16-coordinate geometry to six equivalent Mg(2), nine equivalent Mg(1), and one Tm(2) atom. The Tm(1)-Tm(2) bond length is 3.60 Å. In the second Tm site, Tm(2) is bonded in a 16-coordinate geometry to twelve equivalent Mg(1) and four equivalent Tm(1) atoms.