Abstract
The solubility of tin (up to 6·9 atom %) and of germanium (up to 1·0 atom %) in liquid sodium has been determined by thermal analysis and electrical-resistance methods. The compound NaGe precipitates from dilute solutions of germanium in sodium. Partial molar Enthalpies and entropies of solution in sodium for tin (with respect to Na15Sn4) and germanium (with respect to NaGe) are 46·8 and 44·3 kJ mol–1 and 50·7 and 29·7 J K–1 mol–1 respectively. A simple thermochemical cycle is used to demonstrate that metallic tin and lead dissolve exothermically in liquid sodium but that carbon dissolves endothermically; the cycle is also used to derive solvation energies for the elements Pb, Sn, and C which increase in the order Pb < Sn < C. The sodium–tin phase diagram is augmented over the range 0–6·9 atom % Sn.
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