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Information × Registration Number 0220U104648, 0120U104900 , R & D reports Title Experimental-theoretical study and prediction of photoelastic properties of crystalline materials for control devices for electromagnetic radiation popup.stage_title Head Mytsyk Bohdan H., Доктор фізико-математичних наук Registration Date 24-12-2020 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2 The research object is photoelastic properties of crystals. The aim of the work is to develop methodology for studying photoelasticity and to create a database of promising acousto-optical materials; to predict photoelastic properties based on quantum mechanical calculations. Research method is an interferometric method based on single-pass Mach-Zender interferometer. As a result of modernization of the interferometric installation the base of the interferometer is strengthened and the parasite "constant" of installation is eliminated. Modified methods for measuring the components of the piezoelectric coefficient tensor on samples of lithium niobate, lanthanum-gallium silicate (LGS) and calcium-tantalum gallium silicate were tested. A literature review of the characterization of LGS crystals was performed. The replacement of cations affects the change in the photoelastic properties of crystals, which will form the basis for predicting the effects of photoelasticity in these materials. In the part of the Subcontractor: The object of study is the dielectric crystals of the А2ВХ4 group. The purpose of the work is to develop a methodology for accurate study and prediction of refractive characteristics and to create database of newly synthesized crystalline materials of the А2ВХ4 group for optoelectronic devices. The research methods are: growing crystals from an aqueous solution by the method of evaporation; X-ray powder diffraction for structural studies; dilatometry; immersion method for determining refractive indices; spectral method for determining birefringence; density functional method. A literature review of the physical properties of impurity K2SO4 crystals was performed. Growth setups were modernized, chemical reagents were purchased and K2SO4 single crystal with 3% of copper content was grown; the dispersion dependences of optical characteristics and the mechanical strength of the crystal were investigated. Product Description popup.authors Demyanyshyn Nataliya M. Maksishko Yuliia Ya. Mytsyk Bohdan H. popup.nrat_date 2020-12-24 Close