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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 9, p.853-856

    Paper

Stadnyk V.Yo., Kashuba O.Z., Brezvin R.S., Matviishyn I.M., Rudysh M.Y.

Ivan Franko National University of L’viv
(8, Kyrylo i Mefodiy Str., Lviv 79005, Ukraine; e-mail: vasylstadnyk@ukr.net)

Birefringence Properties of Uniaxially Compressed K2SO4 crystal

Section: Solid matter
Original Author's Text: Ukrainian

Abstract: The influence of the uniaxial mechanical pressure ?m ? 200 bar on the temperature dependence of the birefringence ?ni 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 d?ni/dT. A significant baric shift of the ferroelastic phase transition point toward higher (for ?x) and lower (for ?y and ?z pressures) temperatures was observed, as well as a baric shift of the temperature interval, where the intermediate phase exists, near the phase transition point.

Key words: birefringence, uniaxial press, phase transition.