A mechanism of vacancy diffusion in ordered alloys is examined in some detail for the stoichiometric simple cubic binary alloy. Upper and lower bounds for the ratio G of the self-diffusion coefficients of the two components of the alloy are calculated as functions of the temperature in the reduced temperature range 0 ⩽ T / T c ⩽ 0.5, where T c is the critical temperature of ordering. In this temperature range it is found that 1/ a ⩽ G ⩽ a where a ≃ 2 and only slightly temperature dependent. Such experimental evidence as there is bears out this simple yet striking result.
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E. W. Elcock (1959) studied this question.
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