Search academic texts

Information × Registration Number 0218U000245, 0115U001093 , R & D reports Title Study of defect states in modified optically nonlinear crystals of Sn2P2S6 type. popup.stage_title Head Grabar Oleksandr Oleksijovych, Registration Date 23-01-2018 Organization State Higher Educational Institution "Uzhgorod National University" popup.description2 The project was directed on the experimental research and development of models of defect states in Sn2P2S6-type crystals, analysis of their impact on the physical properties of these crystals, and the production of active media with enhanced photorefractive characteristics on this basis. As a result of the performed project tasks, the following results were obtained. New single crystals of the Sn2P2S6 type were grown, including sampled doped with various elements. Model calculations of energy spectra of crystals with impurities of various types (Ag, Cr, Cu) were prformed and the conclusions on the localization of the corresponding impurity levels were drawn. The electron paramagnetic resonance spectra induced by photoexcitation have been experimentally investigated and defect (vacancy) and impurity states in Sn2P2S6 crystals have been identified on this basis. The influence of radioactive and light irradiation on the dielectric properties of these single crystals was studied. The mobility of photoinduced charge carriers in these materials was determined by a holographic method based on the photorefractive effect. Experiments have been carried out on the investigation of thermostimulated processes (depolarization and luminescence) in the crystals of this type. Product Description popup.authors . Грабар Олександр Олексійович І. М. Стойка К. Є. Глухов М. В. Цигика О. О. Молнар popup.nrat_date 2020-04-02 Close