Abstract
By means of high temperature calorimetry the mixing enthalpies ΔH of liquid Li-Sn alloys have been measured; however, due to experimental problems they were determined only forx Li = 0.01 to 0.5 andx Li = 0.87 to 0.99. The range of temperatures studied was 691 to 938 K. High compound forming tendency in Li-Sn is reflected by a triangular-shaped relation for ΔH vs x Li. The extrapolated maximum of this plot is about −40 kJ mol−1 close to Li4Sn. Using the concentration cell Bi(l)Li3Bi(s)¦ LiF-LiCl¦Li-Sn(l) the emf was measured as function of temperature (775 to 906 K) atx Li = 0.1 to 0.603 enabling calculations of partial thermodynamic data for lithium in liquid Li-Sn solutions. Integral enthalpies calculated from partial enthalpies of lithium correspond well to the calorimetrically obtained integral mixing enthalpies in the concentration range where both emf and calorimetric data were obtained. The extrapolated maximum of ΔH from calorimetric studies and minimum of integral excess entropies from emf measurements correlate well with results of structure measurements and of other structure sensitive properties. All this experimental information indicates a maximum chemical short range order close to the composition Li4Sn.
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Moser, Z., Gasior, W., Sommer, F. et al. Calorimetric and emf studies on liquid Li-Sn alloys. Metall Trans B 17, 791–796 (1986). https://doi.org/10.1007/BF02657142
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DOI: https://doi.org/10.1007/BF02657142