Determination of the henrian activity coefficient of sodium in liquid magnesium

Author: Rosenkilde Christian   Arnesen Liv   Wallevik Oddmund  

Publisher: Springer Publishing Company

ISSN: 1054-9714

Source: Journal of Phase Equilibria, Vol.21, Iss.6, 2000-12, pp. : 521-527

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Abstract

The temperature-dependent Henrian activity coefficient of Na in liquid Mg in the very dilute range has been determined from measurements of equilibrium concentrations of Na in liquid Mg in contact with NaCl-MgCl2 melts of different compositions and temperatures in the range 650 to 790 °C. The term A in the equation RT in γ Na = A was fitted to the experimental results using the equilibrium constant for the reaction 2NaCl (l) + Mg (l) = MgCl2 (l) + 2Na (l) and thermodynamic data for the NaCl-MgCl2 melt. The obtained γ Na is compared to previously measured activity coefficients and activity coefficients calculated from existing solubility data for the Na-Mg system.