The 6-jump cycle mechanism (conceived as a minimum-energy penalty sequence of jumps for certain stoichiometric alloys exhibiting antistructural disorder) was extended to non-stoichiometric compositions of alloys having the B2 structure. Use was made of the 5-frequency model for impurity diffusion as a convenient framework for expressing the formalism. The antistructural atoms were analogous to an impurity, and the 6-jump cycle acted as the diffusion mechanism unit. Expressions for the tracer diffusivity for both atomic components were derived by using the Ising alloy model. Monte Carlo simulation was used to test the expressions obtained, and indicated very good agreement.

A Theory of Tracer Diffusion in Non-Stoichiometric Intermetallic Compounds. I.V.Belova, G.E.Murch: Philosophical Magazine A, 2002, 82[2], 269-83. See also: Calculation of the Phenomenological Coefficients for Diffusion by Six Jump Cycles in Non-Stoichiometric Intermetallic Compounds. I.V.Belova, G.E.Murch: Philosophical Magazine A, 2002, 82[2], 285-96