Different types of inorganic complex fluorides having the band at 700-750 c
m(-1) in their IR spectra are considered. This band seems to be characteris
tic for the simultaneous presence of both fluorine and oxygen atoms in the
crystal lattice of compounds. Its appearance in this range can serve as an
indicator of the presence of oxygen. (C) 2000 Elsevier Science S.A. All rig
hts reserved.