Composition and pressure dependence of the diffusion coefficients in binary liquid alloys

Research output: Conference contribution

Abstract

There are a number of well-known empirical relations for diffusion in solids. For example the proportionality between the self-diffusion activation energy and melting point or between the entropy of the diffusion and the ratio of activation energy and the melting point (Zener rule) are perhaps the best known 'rules of thumb'. We have shown earlier in our Laboratory, that these relations are direct consequences of the similarity of interatomic potentials seen by ions in solids. On the basis of this, similar relations were extended for impurity and self diffusion in binary solid alloys. In this paper, results for binary liquid mixtures will be reviewed. First a minimum derivation of the temperature dependence of the self-diffusion coefficient, D, is presented (minimum derivation in the sense that it states only that the reduced (dimensionless) D should be a universal function of the reduced temperature), using the similarity of interatomic potentials and dimensional analysis. Then the extension of this relation for determination of the pressure and composition dependence of the self-diffusion coefficients is described using pressure and composition dependent scaling parameters (melting point, atomic volume and mass). The obtained universal form (valid for binary liquid alloys) is very useful for the estimation of the temperature, composition and pressure dependence of the self-diffusion coefficients. Finally, the relation for the ratio of the impurity and self-diffusion coefficients is derived.

Original languageEnglish
Title of host publicationDiffusion in Solids and Liquids V
PublisherTrans Tech Publications Ltd
Pages1371-1376
Number of pages6
Volume297-301
ISBN (Print)3908451809, 9783908451808
DOIs
Publication statusPublished - jan. 1 2010

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

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  • Cite this

    Beke, D. L. (2010). Composition and pressure dependence of the diffusion coefficients in binary liquid alloys. In Diffusion in Solids and Liquids V (Vol. 297-301, pp. 1371-1376). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/DDF.297-301.1371