Coherency stresses and diffusion in solids: neutron spectroscopic versus Gorsky effect measurements of deuterium diffusion in niobium View Full Text


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Article Info

DATE

1989-09

AUTHORS

H. Wipf, J. Völkl, G. Alefeld

ABSTRACT

Published neutron scattering and Gorsky effect results on the diffusion and spatial fluctuations of D interstitials in NbDx (x≃0.5) reveal striking differences. It is shown that these differences are caused by coherency stresses which raise the elastic energy of the short-wavelength D fluctuations studied by coherent neutron scattering. Gorsky effect measurements, on the other hand, probe long-range fluctuations which were coherencystress free in the experiments above. The observed differences can quantitatively be explained within the elasticity-theoretical concepts of Cahn, Krivoglaz, and Wagner and Horner. This represents the first successful application of these concepts to a diffusion coefficient. The correlation factor for D diffusion is, finally, determined from a comparison of the Gorsky effect and neutron scattering data. More... »

PAGES

353-358

References to SciGraph publications

  • 1977-12. Sample-shape dependence of the spinodals and the diffusion coefficients for hydrogen in niobium and tantalum in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1978-03. Diffusion of hydrogen and deuterium in Nb and Ta at high concentrations in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1976-05. The Gorsky effect: Recent results in IL NUOVO CIMENTO B (1971-1996)
  • 1974-06. The stability curve for short wavelength density fluctuations of deuterium in niobium in ZEITSCHRIFT FÜR PHYSIK A HADRONS AND NUCLEI
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    http://scigraph.springernature.com/pub.10.1007/bf01321913

    DOI

    http://dx.doi.org/10.1007/bf01321913

    DIMENSIONS

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