U3Ce2O10 is Fluorite-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one U(2), and two equivalent Ce(1) atoms to form OCe2U2 tetrahedra that share corners with four equivalent O(1)Ce2U2 tetrahedra, corners with four equivalent O(3)Ce2U2 tetrahedra, corners with eight equivalent O(2)CeU3 tetrahedra,  an edgeedge with one O(3)Ce2U2 tetrahedra, edges with two equivalent O(2)CeU3 tetrahedra, and edges with three equivalent O(1)Ce2U2 tetrahedra. In the second O site, O(2) is bonded to one U(2), two equivalent U(1), and one Ce(1) atom to form OCeU3 tetrahedra that share corners with four equivalent O(3)Ce2U2 tetrahedra, corners with four equivalent O(2)CeU3 tetrahedra, corners with eight equivalent O(1)Ce2U2 tetrahedra,  an edgeedge with one O(3)Ce2U2 tetrahedra, edges with two equivalent O(1)Ce2U2 tetrahedra, and edges with three equivalent O(2)CeU3 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(1) and two equivalent Ce(1) atoms to form OCe2U2 tetrahedra that share corners with eight equivalent O(1)Ce2U2 tetrahedra, corners with eight equivalent O(2)CeU3 tetrahedra, edges with two equivalent O(1)Ce2U2 tetrahedra, edges with two equivalent O(3)Ce2U2 tetrahedra, and edges with two equivalent O(2)CeU3 tetrahedra.
U3Ce2O10 is Fluorite-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both U(1)-O(1) bond lengths are 2.34 Å. Both U(1)-O(3) bond lengths are 2.32 Å. There are two shorter (2.29 Å) and two longer (2.35 Å) U(1)-O(2) bond lengths. In the second U site, U(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All U(2)-O(1) bond lengths are 2.28 Å. All U(2)-O(2) bond lengths are 2.38 Å. Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Ce(1)-O(2) bond lengths are 2.39 Å. Both Ce(1)-O(3) bond lengths are 2.38 Å. There are two shorter (2.41 Å) and two longer (2.43 Å) Ce(1)-O(1) bond lengths. There are three inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one U(2), and two equivalent Ce(1) atoms to form OCe2U2 tetrahedra that share corners with four equivalent O(1)Ce2U2 tetrahedra, corners with four equivalent O(3)Ce2U2 tetrahedra, corners with eight equivalent O(2)CeU3 tetrahedra,  an edgeedge with one O(3)Ce2U2 tetrahedra, edges with two equivalent O(2)CeU3 tetrahedra, and edges with three equivalent O(1)Ce2U2 tetrahedra. In the second O site, O(2) is bonded to one U(2), two equivalent U(1), and one Ce(1) atom to form OCeU3 tetrahedra that share corners with four equivalent O(3)Ce2U2 tetrahedra, corners with four equivalent O(2)CeU3 tetrahedra, corners with eight equivalent O(1)Ce2U2 tetrahedra,  an edgeedge with one O(3)Ce2U2 tetrahedra, edges with two equivalent O(1)Ce2U2 tetrahedra, and edges with three equivalent O(2)CeU3 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(1) and two equivalent Ce(1) atoms to form OCe2U2 tetrahedra that share corners with eight equivalent O(1)Ce2U2 tetrahedra, corners with eight equivalent O(2)CeU3 tetrahedra, edges with two equivalent O(1)Ce2U2 tetrahedra, edges with two equivalent O(3)Ce2U2 tetrahedra, and edges with two equivalent O(2)CeU3 tetrahedra.