The optical properties of mixed crystals CdTel -x-n/SexSn/ andZnTe1 -,-ySe,Sy are investigated by methods of far infrared spectroscopy. Different types of transformation of the vibrational spectra of these solid solutions with composition are found. The longitudinal and transverse optical vibration frequencies are calculated theoretically by means of a unit cellversion of the random element isodisplacement model. The calculations are in satisfactory agreement with the experimental results. The reflection spectra peculiarities with mixed crystal disordering are discussed.
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