UO3 crystallizes in the orthorhombic Cmmm space group. U(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form a mixture of corner and edge-sharing UO8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent U(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms.
UO3 crystallizes in the orthorhombic Cmmm space group. U(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form a mixture of corner and edge-sharing UO8 hexagonal bipyramids. Both U(1)-O(2) bond lengths are 2.07 Å. There are four shorter (2.22 Å) and two longer (2.36 Å) U(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent U(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent U(1) atoms.