Digitale Medien
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 138 (Mar. 2008), p. 133-144
ISSN:
1662-9779
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Physik
Notizen:
The possibilities of Fisher’s model development and generalization are considered, as thismodel in its classical form contradicts some experimental results. Particularly, it does not explainsuch a phenomenon, observed in Mössbauer studies, as the transfer of grain-boundary diffusingatoms into near-boundary crystallite areas at temperatures when the volume diffusion is admittedlyfrozen. Different models explaining this phenomenon are briefly reviewed, the greatest attentionbeing 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 thatat relatively low temperatures (〈 0.35 – 0.40 Tm) the diffusant pumping from a grain boundaryproceeds much faster than volume diffusion, and possible reasons for that are considered
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.133.pdf
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