THE MISCIBILITY GAP REGION AND LIQUID-LIQUID EQUILIBRIUM IN IMMISCIBLE IN-TL-TE ALLOYS

Electroconductivity measurements were performed for liquid immiscible (InxTlt-x)(0.80)Te-0.20 alloys over a wide temperature range between 1 200 K and the temperature of crystallization under ambient pressures o f argon gas (up to 50 MPa). The electrical conductivity shows the same behaviour as for binary liquid alloys during the mixing-demixing proc ess. It was revealed that variation of the In-to-Tl ratio at constant Te content changes the properties of the coexisting liquids and affect s the phase separation temperature T-c in a nonlinear manner. T-c vari es between 855 K for Tl0.80Te0.20 and 817 K for In0.80Te0.20 with a ma ximum temperature T-c=874 K for In0.37Tl0.43Te0.20. The results are an alyzed in comparison with available data for binary and ternary immisc ible alloys and the possible influence of the ion subsystem on the for mation of the critical point parameters is discussed. (C) 1998 Elsevie r Science S.A.