固体電解質起電力法によるIn-PbおよびIn-Tl液体合金の熱力学的研究

Abstract

The activities of indium in liquid In-Pb and In-Tl alloys were measured by the E.M.F. method over the temperature range 1023-1273 K and 1023-1223 K, respectively. From these activities and their dependence on temperature, the partial and integral molar free energies, the entropies and the enthalpies were calculated for these systems. The cells used were as follows:(This article is not displayable. Please see full text pdf.) From the present experimental results the following conclusion is obtained:(1) The activities of indium and lead in the liquid In-Pb alloys show slightly positive deviations from Raoult’s law. The activity of indium is in agreement with the result by Terpilowski et al. and the activity of lead is located between the result by Sommer et al. and that by Shiu et al. The heat of mixing almost agrees with the result of calorimetric method by Wittig et al. The properties of this system appear to be similar to those of regular solution.(2) The activities of indium and thallium in the liquid In-Tl alloys show very slightly positive deviations from Raoult’s law. The activity values are smaller than those reported by Kundys et al. The heat of mixing in the In-Tl system is close to the result by Wittig et al. The entropy is closer to that of ideal solution than that of the In-Pb system, but the lnγIn vs. NTl2 relation is not linear.