Abstract
The activity of Li in molten Li-Sn alloys was continuously varied and monitored electrochemically in cells of the type Al-LiAl/glass electrolyte/Sn/glass electrolyte/Al-LiAl. The temperature (320 to 380 °C) and compositional dependence of the Li activity coefficient, γLi, was found to follow a quadratic expression of the form In γLi = A + B(1 − XLi)2 up to 30 mole pct lithium. Further, the liquidus temperature, TL, was found to follow TL(°C) = 642 XLi + 188 for 0.20 XLi 0.44 over the temperature range 320 to 470 °C. The partial and integral molar heats of solution were calculated and the results indicate that strong attractive forces exist between Sn and Li. These forces are strong enough to induce substantial ordering in the melt to an extent that the integral molar entropy of mixing at high Li contents (36 mole pct) is negative.
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Barsoum, M.W., Tuller, H.L. Thermodynamics of molten Li-Sn alloys. Metall Trans A 19, 637–644 (1988). https://doi.org/10.1007/BF02649277
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DOI: https://doi.org/10.1007/BF02649277