The influence of the uniaxial mechanical pressure σm ≤ 200 bar on the temperature dependence of the birefringence Δni in K2SO4 crystals in an interval of 300-1000 K has been studied. The uniaxial pressure was found to affect only the magnitude but not the behavior of dΔni/dT. A significant baric shift of the ferroelastic phase transition point toward higher (for σx) and lower (for σy and σz pressures) temperatures was observed, as well as a baric shift of the temperature interval, where the intermediate phase exists, near the phase transition point. K e y w o r d s: birefringence, uniaxial press, phase transition.
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