FREE-ENERGY OF BINARY-LIQUID ALKALI ALLOYS

An ab-initio calculation of Helmholtz free energy of binary liquid all oys viz. Na-K and Sa-Cs has been carried out in the entire range of co mposition. This investigation is carried out using the potential deriv ed from partial pair-potentials as well as the pair-potential obtained in effective medium approximation (EMA). The temperature dependent sp ecific heat capacity required for this study is the experimental in on e case and that obtained through weighted average value in the other o ne. The computed values have been compared with the existing theoretic al results. The minima in the free energy curves show the stable compo sition of these alloys. Further, the temperature variation of the free energy has also been investigated for these systems.