溶融Te-Tl系合金の熱力学的性質

抄録

A study of thermodynamic properties of the liquid Te-Tl alloys has been carried out by the galvanic cell of
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\ oindentThe reliable values of E. M. F. were obtained for the alloys.
Activities of thallium show negative deviations in the wide concentration range and abruptly increase from negative to positive around N_Tl=0.65-0.70 and show positive deviations from Raoult’s law in the thallium-rich side. Activities of tellurium exhibit negative deviations from Raoult’s law over the whole concentration range. The activities of both components approach the ideal lines with increasing temperature.
From the features of α functions of thallium for the system, the alloys are not considered as regular solutions.
It is observed that the anomalous behaviors in Δ\barH_Tl and Δ\barS_Tl at the composition of TeTl₂ are affected by the stable compound in the liquid state. The minimum values of the heat of mixing for the system are −25.3 kJ/mol at about ΔN_Tl=0.65.
In addition, other thermodynamic functions were calculated on the basis of the results obtained.