Dielectric properties of TlIn(S₁-xSex)₂ polycrystals near phase transitions

Studies of polycrystalline TlIn(S₁-xSex)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