Sr2CdUO6 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with six equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one U(1), and one Cd(1) atom to form distorted corner-sharing OSr2UCd tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one U(1), and one Cd(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one U(1), and one Cd(1) atom.
Sr2CdUO6 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. There is one shorter (2.51 Å) and one longer (2.59 Å) Sr(1)-O(1) bond length. There are a spread of Sr(1)-O(2) bond distances ranging from 2.54-2.91 Å. There are a spread of Sr(1)-O(3) bond distances ranging from 2.54-3.16 Å. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with six equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. Both U(1)-O(1) bond lengths are 2.09 Å. Both U(1)-O(2) bond lengths are 2.09 Å. Both U(1)-O(3) bond lengths are 2.10 Å. Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO6 octahedra that share corners with six equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. Both Cd(1)-O(1) bond lengths are 2.36 Å. Both Cd(1)-O(2) bond lengths are 2.32 Å. Both Cd(1)-O(3) bond lengths are 2.37 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one U(1), and one Cd(1) atom to form distorted corner-sharing OSr2UCd tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one U(1), and one Cd(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one U(1), and one Cd(1) atom.