Baric Shift of Phase Transition in Ammonium Sulfate Crystals

V.M. Gaba Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine

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The influence of uniaxial mechanical pressures (σm ≤ 200 bar) on the spectral (300-800 nm) and temperature (77-300 K) dependences of the refractive indices ni, the birefringence Δni and the phase transition point in ammonium sulfate crystals are studied. It is established that the uniaxial pressure does not change character of the dispersion dni/dλ, but only its value λ The shift of the phase transition in ammonium sulfate under the uniaxial mechanical pressure is analyzed.

DOI: 10.12693/APhysPolA.117.126 PACS numbers: 77.84.Fa, 78.20.Ci, 77.80.Bh