Abstract
By means of Monte Carlo computer simulation we have explored the validity of the Manning relations which connect the phenomenological coefficients to the tracer diffusion coefficients in an alloy. The model chosen for calculation was the ordered binary alloy analogue of the king magnet. The vacancy mechanism was assumed. At temperatures above and below the order-disorder temperature, the Manning relations provide a good simulation, except at compositions approaching impurity levels. The relations then break down because they have built into them a requirement that ω4 = ω0 (four-frequency impurity model notation) in contrast to the model.