Onsager phenomenological coefficients for matter transport were calculated for interstitial dumb-bell jump mechanisms which modelled dilute binary body-centered cubic transition-metal alloys. By using a refinement of a kinetic equation method which had previously been used for dilute and concentrated face-centered cubic alloy models, the linear response expressions were reduced to expressions which contained defect jump frequencies and concentrations and certain Brillouin integrals. An example of the final form for the case where a given mechanism operated alone was described in more detail. Monte Carlo simulation results were in satisfactory agreement with theoretical predictions. It was shown that, even when all of the mechanisms operated simultaneously, simple relationships existed between parts of the 3 independent phenomenological coefficients.

Phenomenological Coefficients for Transport by Dumbbell Mechanisms in a Dilute Random BCC Alloy. S.Sharma, D.K.Chaturvedi, I.V.Belova, G.E.Murch: Philosophical Magazine A, 2001, 81[2], 431-46