Relation between excess volume, excess free energy and isothermal compressibility in liquid alloys

J. Brillo, M. Watanabe, H. Fukuyama

Research output: Contribution to journalArticlepeer-review

Abstract

Excess volume data of 32 liquid alloys were reviewed and plotted versus their excess free energies. It is hereby found that all combinations of the signs of EV and EG are possible. The excess volume data split into two different curves which are monotonous in EG. For one of these curves the signs of EV and EG are equal and they are opposite for the other. We improved our previously developed model and found that there is an unspecified sign which can be chosen either + or -, depending on the system. This explains why there are two curves corresponding to the experimental finding. The model relates excess volume, excess free energy and isothermal compressibility with each other whereby the concept of internal pressure is used. The model can also predict the excess volume as function of the excess free energy, when the correct sign, either + or -, is known and a reasonable assumption is made for the effective isothermal compressibility. In the present work, the latter has been estimated as an average from the isothermal compressibility values over the involved pure elements. Good qualitative and quantitative agreement with the experimental data is obtained for the systems investigated. The model is valid at least for -3RT < EG < +1RT.

Original languageEnglish
Article number114395
JournalJournal of Molecular Liquids
Volume326
DOIs
Publication statusPublished - 2021 Mar 15

Keywords

  • Excess free energy
  • Excess volume
  • Internal pressure
  • Isothermal compressibility
  • Liquid metallic alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Relation between excess volume, excess free energy and isothermal compressibility in liquid alloys'. Together they form a unique fingerprint.

Cite this