The correlation of the thermodynamic properties and phase diagram of the system tin-lead using a gaussian plus krupkowsk

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I.

INTRODUCTION

THE published free energy data on the

liquid state of the tin-lead system are too widely scattered to form a satisfactory starting point for the application of the Gaussian plus Krupkowski formalism of Esdaile ~ to the representation of the thermodynamic properties and phase diagram of this system, as discussed under the heading "Activity Data". Instead, the present correlation is based on the precise liquidus boundary data given here, the lead-rich solvus data of Cahn and Treaftis, 2 the lead-rich solidus boundary data of ttultgren and Lever3 and Dobovisek and Smajic, ~ the heats of solution of the liquid by Kleppa, 5 and the heats of solution of the solid given by Kendall and Hultgren 6 and Murphy and Oriani. 7 The equations required by the correlation are listed, the authors' liquidus boundary data are presented, an unambiguous method for calculating the composition of the liquidus and solidus boundaries is discussed, and comparisons are made between the experimental data and the requirements of the present correlation.

II.

LIQUIDUS BOUNDARY DATA AND THE EUTECTIC POINT

The tin used for these experiments was supplied by Associated Tin Smelters of Australia and contained

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