Permeability, diffusivity and solubility were studied by using a permeation gas-phase technique and a computer-controlled micro-balance system at temperatures ranging from 323 to 773K, and pressures ranging from 1Pa to 0.1MPa. It was found that the results could be described by the expressions:

D:      P (mol/ms√Pa) = 3.43 x 10-8 exp[-6156/RT]

H:      P (mol/ms√Pa) = 5.58 x 10-8 exp[-6304/RT]

D:     D (m2/s) = 1.87 x 10-7 exp[-24685/RT]

H:     D (m2/s) = 3.07 x 10-7 exp[-25902/RT]

E.Serra, M.Kemali, A.Perujo, D.K.Ross: Metallurgical and Materials Transactions A, 1998, 29[3], 1023-30