Phase Diagram of Rb_2xTl_2(1−x)Cd₂(SO₄)₃ Solid Solutions

R. VLOKH Institute of Physical Optics, 23 Dragomanov Str., L'viv, Ukraine, 79005

I. GIRNYK Institute of Physical Optics, 23 Dragomanov Str., L'viv, Ukraine, 79005

I. MARTUNYUK-LOTOTSKA Institute of Physical Optics, 23 Dragomanov Str., L'viv, Ukraine, 79005

Z. CZAPLA Institute of Experimental Physics Wroclaw University, 9 M.Born Sq., Wroclaw, Poland

S. DACKO Institute of Experimental Physics Wroclaw University, 9 M.Born Sq., Wroclaw, Poland

B. KOSTUREK Institute of Experimental Physics Wroclaw University, 9 M.Born Sq., Wroclaw, Poland

Abstract

The concentration-temperature phase diagram of Rb_2xTl_2(1−x)Cd₂(SO₄)₃ solid solutions is obtained. It is found that the sequence of phase transitions is P2₁3 ⇔ P2₁ ⇔ P1 ⇔ P2₁2₁2₁ at x = 0−l0.5, while the temperature of phase transition from the cubic phase rapidly increases at x = 0.5−1 and a new phase with the symmetry R3 is inclined between the phases with symmetries P2₁3 and P2₁.

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Phase Diagram of Rb_2xTl_2(1−x)Cd₂(SO₄)₃ Solid Solutions