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Reply to comment “On the surface self-diffusion coefficient”

✍ Scribed by N.A Gjostein; J.P Hirth

Publisher
Elsevier Science
Year
1966
Weight
309 KB
Volume
14
Category
Article
ISSN
0001-6160

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✦ Synopsis

899

where AGa is the Gibbs free energy for formation of adsorbed atoms and g a geometrical factor depending on their source (4) Thus within the limitations of the model of surface diffusion by adsorbed atom migration the surface tracer diffusivity is, apart from correlation factors, t,he same as that derived for mass transfer.

It must therefore be concluded that in order to predict whether in any set of experiments the tracer diffusivity will differ from the mass transport value, the relaxation time associated with the approach to local equilibrium must be known.

📜 SIMILAR VOLUMES

Reply to comments on “Self-diffusion and
Reply to comments on “Self-diffusion and elastic constants in the anomalous b.c.c. metals”
✍ H.I. Aaronson; P.G. Shewmon 📂 Article 📅 1967 🏛 Elsevier Science ⚖ 278 KB

Now wvaph = -Pwv2h so that (aAG/ap)T = AV and any pressure-variation of AF (through elastic moduli) is irrelevant. A lattice diffusivity increasing with increasing pressure implies a negative activation volume AV. However, it is not certain that the simple effect on lattice diffusion was measured