Mg3U is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to eight equivalent Mg(2) and six equivalent U(1) atoms. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(1) and four equivalent U(1) atoms. U(1) is bonded in a distorted body-centered cubic geometry to six equivalent Mg(1) and eight equivalent Mg(2) atoms.
Mg3U is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to eight equivalent Mg(2) and six equivalent U(1) atoms. All Mg(1)-Mg(2) bond lengths are 3.17 Å. All Mg(1)-U(1) bond lengths are 3.66 Å. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(1) and four equivalent U(1) atoms. All Mg(2)-U(1) bond lengths are 3.17 Å. U(1) is bonded in a distorted body-centered cubic geometry to six equivalent Mg(1) and eight equivalent Mg(2) atoms.