BaO3 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1) and two equivalent O(2) atoms to form distorted corner-sharing OBa3O2 trigonal bipyramids. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent O(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to four equivalent Ba(1) atoms.
BaO3 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. Both Ba(1)-O(2) bond lengths are 2.92 Å. There are a spread of Ba(1)-O(1) bond distances ranging from 2.75-2.84 Å. All Ba(1)-O(3) bond lengths are 2.73 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1) and two equivalent O(2) atoms to form distorted corner-sharing OBa3O2 trigonal bipyramids. Both O(1)-O(2) bond lengths are 1.81 Å. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent O(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to four equivalent Ba(1) atoms.