CONNECTION BETWEEN THE PREEXPONENTIAL FACTOR AND THE ACTIVATION ENTHALPY FOR SELF- AND IMPURITY DIFFUSION.

D. Beke, Tamas Geszti, Gabor Erdelyi

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The empirically well established constancy of the activation entropy of self-diffusion S//v plus S//m (S//v and S//m are the entropies of the formation and migration of vacancies, respectively) over classes of metals of the same structure is derived from simple dimensional considerations, using the similarity of interatomic potentials. The same similarity considerations, supplemented by the introduction of a single parameter characterizing the strength of the host/impurity interaction, furnish another well known empirical rule, namely the approximate proportionality between ln (D//o//i/D//o) and (Q//i minus Q)/T//m, where D//o and D//o//i are the preexponential factors, Q and Q//i the activation enthalpies for self- and impurity diffusion, respectively, and T//m is the melting temperature of the host crystal.

Original languageEnglish
Pages (from-to)444-447
Number of pages4
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume68
Issue number6
Publication statusPublished - Jun 1977

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Enthalpy
Entropy
enthalpy
Chemical activation
activation
Impurities
entropy
impurities
Vacancies
Melting point
Metals
melting
Crystals
metals
crystals
interactions
temperature

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

CONNECTION BETWEEN THE PREEXPONENTIAL FACTOR AND THE ACTIVATION ENTHALPY FOR SELF- AND IMPURITY DIFFUSION. / Beke, D.; Geszti, Tamas; Erdelyi, Gabor.

In: Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques, Vol. 68, No. 6, 06.1977, p. 444-447.

Research output: Contribution to journalArticle

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