Analysis of Possibilities of Fisher’s Model Development

Abstract:

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The possibilities of Fisher’s model development and generalization are considered, as this model in its classical form contradicts some experimental results. Particularly, it does not explain such a phenomenon, observed in Mössbauer studies, as the transfer of grain-boundary diffusing atoms into near-boundary crystallite areas at temperatures when the volume diffusion is admittedly frozen. Different models explaining this phenomenon are briefly reviewed, the greatest attention being paid to a model accounting for the presence of equilibrium-composition near-boundary layers. It is demonstrated that based on the results of grain boundaries investigations one can conclude that at relatively low temperatures (< 0.35 – 0.40 Tm) the diffusant pumping from a grain boundary proceeds much faster than volume diffusion, and possible reasons for that are considered.

Info:

Periodical:

Solid State Phenomena (Volume 138)

Edited by:

J. Čermák and I. Stloukal

Pages:

133-144

DOI:

10.4028/www.scientific.net/SSP.138.133

Citation:

V. V. Popov "Analysis of Possibilities of Fisher’s Model Development", Solid State Phenomena, Vol. 138, pp. 133-144, 2008

Online since:

March 2008

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$35.00

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