The band at 700–750 cm−1 in the IR spectra of inorganic complex fluorides as an oxygen sensor

Different types of inorganic complex fluorides having the band at 700–750 cm−1 in their IR spectra are considered. This band seems to be characteristic 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.