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We report experimental results for the spectral dependences of the optical absorption edge in (As 2 S 3 ) 100-x (SbSI) x (0 ≤ x ≤ 90) glasses. Our studies have shown that increasing of antimony sulfoiodide (SbSI) content in the glass composition and the temperature increase lead to shift in the absorption edge towards long-wavelength range. The optical absorption edge

Abstract. Studies of polycrystalline TlIn(S 1-x Se x ) 2 samples under hydrostatic pressure were performed. Determined in this work were pressure coefficients near temperatures of ε(T) anomalies. Based on studying the temperature dependences of dielectric permittivity values for various hydrostatic pressures, (р, Т) phase diagram was built. Phase transformations are found in the pressure range of p > 550 MPa.