Thus, the intermediate phase is formed from c-BiF3 and the resulting product from it on increased degree of defluorination is t-BiOF. Both, c-BiF3 and t-BiOF have Bi-sublattices which can be described by a regular or distorted F-centered subcell (Figure ); since the anions are much weaker scatters than Bi, the diffraction pattern (i.e., relative intensities of main reflections) of all Bi-O-F-phases investigated here are mostly influenced by the bismuth sublattice.