Calculation of the phenomenological coefficients for diffusion by six jump cycles in non-stoichiometric intermetallic compounds

Title: Calculation of the phenomenological coefficients for diffusion by six jump cycles in non-stoichiometric intermetallic compounds
Creator: Belova, I. V.; Murch, G. E.
Relation: Philosophical Magazine A: Physics of Condensed Matter Structure Defects and Mechanical Properties Vol. 82, Issue 2, p. 285-296
Publisher Link: http://dx.doi.org/10.1080/01418610208239599
Publisher: Taylor & Francis
Resource Type: journal article
Date: 2002
Description: In this paper, the six-jump-cycle mechanism, which was conceived as a minimum-energy-penalty sequence of jumps for certain stoichiometric alloys showing antistructural disorder, is extended and employed to calculate the phenomenological coefficients for diffusion at non-stoichiometric compositions for alloys taking the B2 structure. We adopt an analogue of the five-frequency model for impurity diffusion by using antistructural atoms as the 'impurity' and the six-jump cycle as the diffusion mechanism unit. We frame the formalism in the Ising alloy model. We derive asymptotic (T → 0) expressions for the phenomenological coefficients. The results obtained are in excellent agreement with Monte Carlo computer simulations.
Identifier: http://hdl.handle.net/1959.13/34022
Identifier: uon:3479
Identifier: ISSN:0141-8610
Language: eng
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