PaO3 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Pa(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form a mixture of distorted face, corner, and edge-sharing PaO12 cuboctahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Pa(1) atoms to form a mixture of corner and edge-sharing OPa4 tetrahedra. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Pa(1) atoms.
PaO3 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Pa(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form a mixture of distorted face, corner, and edge-sharing PaO12 cuboctahedra. All Pa(1)-O(2) bond lengths are 2.60 Å. All Pa(1)-O(1) bond lengths are 2.39 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Pa(1) atoms to form a mixture of corner and edge-sharing OPa4 tetrahedra. In the second O site, O(2) is bonded in a square co-planar geometry to four equivalent Pa(1) atoms.