Non parabolic shift of interfaces and effect of diffusion asymmetry on nanoscale solid state reactions

D. L. Beke, Z. Erdélyi, Z. Balogh, Cs Cserháti, G. L. Katona

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3 Citations (Scopus)

Abstract

In a set of recent papers we have shown that the diffusion asymmetry in diffusion couples (the diffusion coefficient is orders of magnitude larger in one of the parent materials) leads to interesting phenomena: i) sharp interface remains sharp and shifts with non Fickian (anomalous) kinetics [1-5], ii) originally diffuse interface sharpens even in ideal (completely miscible) systems [6,7], iii) an initially existing thin AB phase in A/AB/B diffusion couple can be dissolved [8], iv) there exists a crossover thickness (typically between few nanometers and 1μm) above which the interface shift turns back to the Fickian behaviour [9], v) the growth rate of a product of solid state reaction can be linear even if there is no any extra potential barrier present (which is the classical interpretation of the "interface reaction control" for linear kinetics) [10]. These latter results will be summarized and reformulated according to the usual expression for linear-parabolic law containing the interdiffusion coefficient, D, and interface transfer coefficient, K. Relation between the activation energies of D and K will be analyzed and compared with available experimental data.

Original languageEnglish
Pages (from-to)43-49
Number of pages7
JournalJournal of Nano Research
Volume7
DOIs
Publication statusPublished - Jul 7 2009

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Keywords

  • Interdiffusion
  • Interface transfer coefficient
  • Linear-parabolic shift of interfaces
  • Nanoscale
  • Non-linear diffusion

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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