The miscibility gap region and liquid–liquid equilibrium in immiscible In–Tl–Te alloys

Abstract

Electroconductivity measurements were performed for liquid immiscible (In x Tl 1− x ) 0.80Te 0.20 alloys over a wide temperature range between 1200 K and the temperature of crystallization under ambient pressures of argon gas (up to 50 MPa). The electrical conductivity shows the same behaviour as for binary liquid alloys during the mixing–demixing process. It was revealed that variation of the In-to-Tl ratio at constant Te content changes the properties of the coexisting liquids and affects the phase separation temperature T c in a nonlinear manner. T c varies between 855 K for Tl 0.80Te 0.20 and 817 K for In 0.80Te 0.20 with a maximum temperature T c=874 K for In 0.37Tl 0.43Te 0.20. The results are analyzed in comparison with available data for binary and ternary immiscible alloys and the possible influence of the ion subsystem on the formation of the critical point parameters is discussed.