International Ukrainian-Lithuanian Agreement

“New multiferroics and superionic conductors for acoustoelectronics and solid ionic”

(principal investigator - Doctor of Sciences in Physical and Mathematical Sciences, Professor Yulian Vysochanskii)

Duration of the project: June 2017 – December 2017

Purpose: to develop a method for determining the photorefractive parameters of SnP2S6crystals using holographic schemes with phase-modulated laser beams, as well as to implement and optimize heterodyne schemes of dynamic interferometers based on nonlinear crystal data.

Result: the investigations of low-frequency noise characteristics of a ferrielectric CuInP2S6 crystal are presented at the vicinity of phase transition. Loops of ferroelectric hysteresis were obtained. Additionally the dielectric properties and conductivity of newly synthesized AgCrP2S6 and phosphorous Cu02Ag08CrP2S6 chalcogenide crystals are presented. Superionic conductors of the system Cu6PS5I-Cu7PS6 in polycrystalline, composite and monocrystalline form have been obtained. Their crystal structure, electric and dielectric properties, Raman scattering are investigated.

International Ukrainian-Belarusian Agreement

“Study of the photorefractive characteristics of Sn2P2S6 crystal for application in dynamic interferometry”

(principal investigator - Doctor of Sciences in Physical and Mathematical Sciences, Professor Oleksandr Hrabar)

Duration of the project: May 2017 – November 2017

Purpose: to develop a method for determining the photorefractive parameters of Sn2P2S6 crystals by using holographic schemes with phase-modulated laser beams.

Result: new doped Sn2P2S6 single crystals are obtained and investigated, their basic parameters are measured. It has been shown that doping with silver and copper reduces the gain coefficients and complicate the dynamics of the photorefractive response, which can be used in dynamic interferometers. A method for determining the parameters of the vibrations for these interferometric schemes is elaborated.