The so-called interruption kinetic technique was applied to the oxidation of tungsten under 0.048bar O2. The oxygen diffusion coefficient in growing WO8-x was determined at 568 to 908C and could be expressed as:

D(cm2/s) = 6.83 x 10-2 exp[-29.89(kcal/mol)/RT]

V.K.Sikka, C.J.Rosa: Corrosion Science, 1980, 20[11-12], 1201-19