Shpak O. Spectrophotometric studies of functional materials based on non-crystal chalcogenides for optoelectronics and optical recording of information

The dissertation is devoted to the study of the basic regularities of the influence of disorder effects on the optical–refractrometric and dielectric properties, also the research of the physical processes occurring in them under the influence of temperature, irradiation and change of chemical composition. The dispersion of the refractive index and its temperature coefficient for glass-like alloys of Ag(Hg)–As–S(Se) systems has been studied. Mechanisms determining the magnitude and sign of the temperature derivative of refractive index are established. Optical-refractometric (OR) analysis and prognostic calculations of OR-parameters as a function of composition and temperature were performed. The temperature-frequency dependences of the dielectric and electrical parameters of glass-like alloys of Ag(Hg)–As–S(Se) systems have been studied. The contribution of different types of polarization to the dielectric constant of alloys in the sections of Ag2S(Sе)–As2S3(Sе3) is determined, a variant of their structural-chemical structure is proposed. It was found that glass-like alloys of the Ag–As–S(Se) system possess an electronic-ionic character of electrical conductivity.