U2CeO6 is Fluorite-derived structured and crystallizes in the monoclinic C2/m space group. U(1) is bonded in a body-centered cubic geometry to one O(2), three equivalent O(1), and four equivalent O(3) atoms. Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent U(1) and one Ce(1) atom to form OCeU3 tetrahedra that share corners with three equivalent O(2)Ce3U tetrahedra, corners with six equivalent O(3)U4 tetrahedra, corners with seven equivalent O(1)CeU3 tetrahedra, edges with three equivalent O(2)Ce3U tetrahedra, and edges with three equivalent O(3)U4 tetrahedra. In the second O site, O(2) is bonded to one U(1) and three equivalent Ce(1) atoms to form OCe3U tetrahedra that share corners with three equivalent O(1)CeU3 tetrahedra, corners with four equivalent O(3)U4 tetrahedra, corners with nine equivalent O(2)Ce3U tetrahedra, edges with three equivalent O(2)Ce3U tetrahedra, and edges with three equivalent O(1)CeU3 tetrahedra. In the third O site, O(3) is bonded to four equivalent U(1) atoms to form OU4 tetrahedra that share corners with four equivalent O(2)Ce3U tetrahedra, corners with six equivalent O(1)CeU3 tetrahedra, corners with six equivalent O(3)U4 tetrahedra, edges with three equivalent O(1)CeU3 tetrahedra, and edges with three equivalent O(3)U4 tetrahedra.
U2CeO6 is Fluorite-derived structured and crystallizes in the monoclinic C2/m space group. U(1) is bonded in a body-centered cubic geometry to one O(2), three equivalent O(1), and four equivalent O(3) atoms. The U(1)-O(2) bond length is 2.21 Å. There are two shorter (2.31 Å) and one longer (2.38 Å) U(1)-O(1) bond length. There is one shorter (2.30 Å) and three longer (2.38 Å) U(1)-O(3) bond lengths. Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Ce(1)-O(1) bond lengths are 2.47 Å. There are four shorter (2.41 Å) and two longer (2.42 Å) Ce(1)-O(2) bond lengths. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent U(1) and one Ce(1) atom to form OCeU3 tetrahedra that share corners with three equivalent O(2)Ce3U tetrahedra, corners with six equivalent O(3)U4 tetrahedra, corners with seven equivalent O(1)CeU3 tetrahedra, edges with three equivalent O(2)Ce3U tetrahedra, and edges with three equivalent O(3)U4 tetrahedra. In the second O site, O(2) is bonded to one U(1) and three equivalent Ce(1) atoms to form OCe3U tetrahedra that share corners with three equivalent O(1)CeU3 tetrahedra, corners with four equivalent O(3)U4 tetrahedra, corners with nine equivalent O(2)Ce3U tetrahedra, edges with three equivalent O(2)Ce3U tetrahedra, and edges with three equivalent O(1)CeU3 tetrahedra. In the third O site, O(3) is bonded to four equivalent U(1) atoms to form OU4 tetrahedra that share corners with four equivalent O(2)Ce3U tetrahedra, corners with six equivalent O(1)CeU3 tetrahedra, corners with six equivalent O(3)U4 tetrahedra, edges with three equivalent O(1)CeU3 tetrahedra, and edges with three equivalent O(3)U4 tetrahedra.