Liquid gallium-lead mixture phase diagram, surface tension near the critical mixing point, and prewetting transition

S. M. Osman, B. Grosdidier, I. Ali, A. Ben Abdellah

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Quite recently, we reported a semianalytical equation of state (EOS) for the Ga-Pb alloy, which was based on the first-order perturbation theory of fluid mixtures, within the simplified random phase approximation, in conjunction with the Grosdidier model pair potentials for Ga-Ga and Pb-Pb with a suitable nonadditive pair potential between Ga-Pb unlike pairs. In the present work, we employ the present EOS to calculate the Ga-Pb phase diagram along the immiscibility gap region. The accuracy of the EOS is tested by consulting the empirical binodal curve. A statistical-mechanical-based theory for the surface tension is employed to obtain an analytical expression for the alloy surface tension. We calculated the surface tension along the bimodal curve and at extreme conditions of temperatures and pressures. The surface tension exhibits reasonably well the prewetting transition of Pb atoms at the surface of the Ga-rich liquid alloy and could qualitatively explain the prewetting phenomena occurring in the Ga-rich side of the phase diagram. The predicted prewetting line and wetting temperature qualitatively agree with the empirical measurements.

Original languageEnglish
Article number062103
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume87
Issue number6
DOIs
Publication statusPublished - Jun 3 2013

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Medicine(all)

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