Interdiffusion data for the zeta phase at 900 to 1050C were determined by using aluminized vapor/solid diffusion-couples and electron microprobe techniques. It was found that the Arrhenius plot was straight, and that the results could be described by:

D(cm2/s) = 219 exp[-58.4(kcal/mol)/RT]

An unusual feature of the data was that, at 1000C, the values were 2 orders of magnitude greater than those for other phases in the system.

R.K.Bamola, L.L.Seigle: Metallurgical Transactions A, 1989, 20[11], 2561-3