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Journal of Physical Studies 6(3), 324–328 (2002)
DOI: https://doi.org/10.30970/jps.06.324 ELEKTROPHYSICAL PROPERTIES OF Tl–Se LIQUID ALLOYS IN THE WIDE CONCENTRATION AND TEMPERATURE RANGESV. Sklyarchuk, Yu. Plevachuk, V. Didoukh
Ivan
Franko National University of Lviv, Faculty of Physics, |
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Electrical conductivity and thermo-e.m.f. measurements were performed for binary Tl$_{1-x}$Se$_x$ liquid alloys in a wide temperature range (up to 1600 K) under ambient pressures of argon gas (up to 25 MPa). It was shown that no clear-cut approach to an explanation of electron properties of liquid Tl-Se alloys with a higher thallium or selenium content than in the stoichiometric compound Tl$_2$Se exists. The results for alloys with an excess of Se are construed on the assumption that the initial matrix can be doped by Se, which forms acceptor levels. Concentrations with an access of Tl fall within the miscibility gap region showing the different temperature dependencies of electrical conductivity of the coexisting liquids upon a stratification process. The liquid-liquid coexistence curve and parameters of the critical point were specified as $x_C=19.7\pm 0.1$ ат.\% Se and $T_C=1036\pm 2.1$ K on the basis of the electrical conductivity measurements. The critical indices $β$ and $(1-α)$ were estimated as $0.35\pm 0.02$ and $0.87\pm 0.02$, respectively. An asymmetry of the coexistence curve and the non-linearity of its diameter are analyzed in comparison with the available data for fluid metals in the vicinity of liquid-vapor critical point.
PACS number(s): 64.70.-p, 71.22.+i