Abstract
From measurements of temperature dependences of the birefringence and from observations of the domain structure the x, T–phase diagram for the Rb2 x Tl2(1− x )Cd2(SO4)3 solid solutions have been obtained. Ferroelastic domain structure and movement of phase boundaries have been studied in the course of phase transitions in Rb2 x Tl2(1− x )Cd2(SO4)3 crystals. Possible reasons for the appearance of mechanically non-compatible (‘forbidden’) ferroelastic domain walls are given.
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