Phase diagram and domain structure of the Rb₂_xTl₂₍₁₋_x₎Cd₂(SO₄)₃ solid solutions

Andriy Say Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Yuriy Vasylkiv Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Ihor Teslyuk Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Oxana Vlokh Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Iryna Martynyuk-Lototska Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Sergiy Sveleba Electronics Department, Lviv National University, 107 Tarnavski St., 79017 Lviv, Ukraine

Ihor Girnyk Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine

Rostyslav Vlokh Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, UkraineCorrespondence[email protected]

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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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Phase diagram and domain structure of the Rb₂_xTl₂₍₁₋_x₎Cd₂(SO₄)₃ solid solutions

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Phase diagram and domain structure of the Rb₂_xTl₂₍₁₋_x₎Cd₂(SO₄)₃ solid solutions