Surface tension estimation of high temperature melts of the binary alloys Ag–Au

ABSTRACT
Surface tension calculation of the binary alloys Ag–Au at
the temperature of 1381 K, where Ag and Au have similar
electronic structures and their atomic radii are comparable,
are carried out in this study using several equations over
entire composition range of Au. Apparently, the deviations
from ideality of the bulk solutions, such as activities of Ag
and Au are small and the maximum excess Gibbs free energy
of mixing of the liquid phase is for instance −4500 J/mol at
XAu = 0.5. Besides, the results obtained in Ag–Au alloys that
at a constant temperature the surface tension increases with
increasing composition while the surface tension decreases as
the temperature increases for entire composition range of Au.
Although data about surface tension of the Ag–Au alloy are
limited, it was possible to make a comparison for the calculated
results for the surface tension in this study with the available
experimental data. Taken together, the average standard error
analysis that especially the improved Guggenheim model in
the other models gives the best agreement along with the
experimental results at temperature 1383 K although almost
all models are mutually in agreement with the other one.