A study was made of diffusion, in material of technical purity, by using electrolytic charging of the specimens, and serial sectioning analysis for H and D following diffusion annealing. The results (table 163) could be summarised by:

H (0 to 300C):     D (cm2/s) = 5.0 x 10-4 exp[-0.159(eV)/kT]

D (0 to 400C):     D (cm2/s) = 6.4 x 10-4 exp[-0.186(eV)/kT]

B.A.Merisov, G.J.Khadzhai, V.I.Khotkevich: Fizika Metallov i Metallovedenie, 1974, 37[5], 1090-2

 

Table 164

Parameters for H Diffusion in TaHx

 

x

Do (cm2/s)

E (eV)

0.12

3.1 x 10-4

0.143

0.17

4.6 x 10-4

0.164

0.34

3.5 x 10-4

0.162

0.38

4.1 x 10-4

0.170

0.52

4.3 x 10-4

0.182

0.74

2.6 x 10-4

0.170

0.77

3.3 x 10-4

0.183