Connections between thermodynamic quantities and vacancy and diffusion characteristics in binary metallic solid solutions

D. Beke, I. Gödény, F. J. Kedves, G. Erdélyi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

With the use of the similarity of interatomic potentials relations concerning vacancy and diffusion characteristics in disordered regular solid solutions have been derived. It has been shown that the vacancy concentration is constant along ifTc(x) = TA + (TB - TA)x + 2ΔTx(1-x), (TA and TB are the melting points of pure components A and B respectively, and ΔT is proportional to the excess enthalpy of mixing, x is the concentration of the atoms B) which is proportional to the binding energy of the crystal. The validity conditions of several empirical rules known in the literature are also analyzed. It has been found that the generalization of the well-known rule for self- and impurity diffusion in pure metals has the following form In D0z(x) ∼ p Qz(x) Tc(x) (Z = A or B) where p is a constant for alloys having identical structures (D0z(x) and Qz(x) denote the preexponential factors and the activation energies respectively). The results calculated from the relations derived were compared with experimental data for tracer diffusion in the systems AgAu, CuNi (having slight deviation from regularity), Pb-Tl (showing ordering phenomena) and AlZn (clustering effects) and a good agreement was found.

Original languageEnglish
Pages (from-to)543-555
Number of pages13
JournalJournal of Physics and Chemistry of Solids
Volume40
Issue number7
DOIs
Publication statusPublished - 1979

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Vacancies
Solid solutions
solid solutions
Thermodynamics
thermodynamics
Binding energy
regularity
melting points
tracers
Melting point
Enthalpy
Activation energy
binding energy
enthalpy
Metals
Impurities
activation energy
deviation
impurities
Atoms

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Connections between thermodynamic quantities and vacancy and diffusion characteristics in binary metallic solid solutions. / Beke, D.; Gödény, I.; Kedves, F. J.; Erdélyi, G.

In: Journal of Physics and Chemistry of Solids, Vol. 40, No. 7, 1979, p. 543-555.

Research output: Contribution to journalArticle

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