Densities of Pt–X (X: Fe, Co, Ni and Cu) binary melts and thermodynamic correlations

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Abstract

The densities of liquid binary Pt–X (X: Fe, Co, Ni and Cu) alloys were measured over a wide temperature range including the supercooled liquid region, using electromagnetic levitation under a static magnetic field. The static magnetic field effectively suppressed translational motion and surface oscillation of the levitated Pt–X sample droplets, enabling high-accuracy density measurement in a non-contact manner. The excess molar volumes (VE) of the liquid alloys were evaluated from the density measurements, and we demonstrated that the liquid Pt–X systems have positive VE with negative excess molar Gibbs energy (GE). The Pt–X systems have the common feature that order–disorder transitions are present in their phase diagrams. It should be also noted that VE decreases and GE increases with increasing number of electrons in the 3d orbital of X. This unique feature in the liquid Pt–X systems was discussed with possible rearrangement of electronic structure caused by alloying Pt with X.

Original languageEnglish
Article number112596
JournalFluid Phase Equilibria
Volume515
DOIs
Publication statusPublished - 2020 Jul 1

Keywords

  • Density
  • Electromagnetic levitation
  • Enthalpy of mixing
  • Excess gibbs energy
  • Excess volume
  • Liquid binary alloy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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