The diffusivity was determined by using an electrochemical method at 1023 to 1223K. The results could be described by:

D (cm2/s) = 2.13 x 10-3 exp[-28.2(kcal/mol)/RT]

S.N.S.Reddy, R.A.Rapp: Metallurgical Transactions B, 1980, 11[3], 99-106