Y. Rosenfeld, COMMENT ON EQUATION OF STATE AND PHASE-DIAGRAMS FOR DENSE MULTI-IONICMIXTURE PLASMAS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 52(3), 1995, pp. 3292-3296
An equation of state for dense fluid binary-ionic mixture (BIM) plasma
s was derived recently by Ogata, Iyetomi, Ichimaru, and Van Horn [Phys
. Rev. E 48, 1344 (1993)] from extensive Monte Carlo simulations data.
They emphasized in particular the significance of finding negative de
viation from the linear-mixing approximation. In this Comment, I show
that the important features of their results are the outcome of their
particular choice for the equation of state of the one-component plasm
a, which has relatively large error bars that have not been properly t
aken into account and are not necessarily borne out by their data for
the binary mixtures. I repeated their analysis of their same data for
the bindary mixtures, but used another, comparable, one-component plas
ma fluid equation of state to find always positive deviations from lin
ear mixing, in contradiction also with the sum-rule analysis of their
free energy with respect to the zero separation of the screening poten
tials.