Optical spectroscopy methods were used to study the spectra of charact
eristic energy losses of some ABO(3) (oxygen-octahedral) ferroelectric
s. The dominant role of the BO6 octahedra in the formation of the ener
gy spectra of oxygen octahedral ferroelectrics was demonstrated. Anoma
lous behaviour was exhibited by the function representing the characte
ristic energy losses in the region of the phase transitions (PT) of so
me crystals.