The diffusivity of H in these alloys was determined (table 141) by using an electrochemical permeation method. It was suggested that the first-nearest neighbor octahedral sites around solute atoms had an anti-trapping effect, and that the differences in H migration energies were independent of the type of solute.

Y.Sakamoto, H.Kaneko, T.Tsukahara, S.Hirata: Scripta Metallurgica, 1987, 21[4], 415-20

 

 

 

Table 141

Diffusion of H in Pd Alloys

 

Solute

C (at%)

Do (m2/s)

E (kJ/mol)

-

0

1.05 x 10-7

21.42

B

2.5

1.03 x 10-7

20.88

B

5.0

8.33 x 10-8

20.47

B

7.5

5.40 x 10-8

19.86

B

10.0

3.30 x 10-8

18.77

Ce

2.0

3.46 x 10-8

18.07

Ce

4.0

2.21 x 10-8

16.57

Ce

6.0

1.75 x 10-8

15.90

Ce

8.0

1.89 x 10-8

15.86

Ce

10.0

2.19 x 10-8

16.32

Y

2.0

1.08 x 10-7

21.17

Y

3.9

9.66 x 10-8

20.79

Y

6.0

7.99 x 10-8

20.33

Y

8.0

4.49 x 10-8

19.20

Y

10.0

1.90 x 10-8

17.53