The time-lag permeation method was used to determine the diffusivity of H at temperatures ranging from 496 to 946C. Previous measurements had indicated a large positive deviation from Arrhenius behavior at temperatures above 600C. No such deviation was found in the present measurements; which were also in good accord with previous determinations that had been made at lower temperatures. The diffusivity at temperatures ranging from 469 to 946C could be described by:

D (m2/s) = 2.83 x 10-7 exp[-21.7(kJ/mol)/RT]

The Diffusivity of Hydrogen in Palladium. K.Katsuta, R.J.Farraro, R.B.McLellan: Acta Metallurgica, 1979, 27[7], 1111-4

 

Table 128

Parameters for H Diffusion in Pd at 279 to 335K

 

Condition

Do (m2/s)

E (kJ/mol)

annealed

9.36 x 10-8

21.42

annealed

1.03 x 10-7

21.51

annealed

1.05 x 10-7

21.42

annealed

1.08 x 10-7

21.51

annealed

1.10 x 10-7

21.55

cold-worked

5.47 x 10-8

22.22

cold-worked

6.43 x 10-8

22.05

cold-worked

8.07 x 10-8

22.18

cold-worked

9.80 x 10-8

22.09

cold-worked

1.13 x 10-7

21.92