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 161) 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.Khadzhay, V.I.Khotkevich: Fizika Metallov i Metallovedenie, 1974, 37[5], 1090-2

 

 

 

Table 161

Diffusivity of H and D in Ta

 

Isotope

Temperature (C)

D (cm2/s)

H

0

5.6 x 10-7

H

22

9.9 x 10-7

H

23

1.04 x 10-6

H

25

1.07 x 10-6

H

30

1.04 x 10-6

H

30

1.16 x 10-6

H

46

1.36 x 10-6

H

60

1.65 x 10-6

H

77

2.20 x 10-6

H

100

3.10 x 10-6

H

125

5.7 x 10-6

H

150

7.7 x 10-6

H

175

7.8 x 10-6

H

205

1.24 x 10-5

H

225

1.11 x 10-5

H

225

1.11 x 10-5

H

250

1.33 x 10-5

H

302

2.00 x 10-5

D

0

2.4 x 10-7

D

30

4.8 x 10-7

D

46

8.9 x 10-7

D

60

9.6 x 10-7

D

77

1.13 x 10-6

D

100

1.80 x 10-6

D

125

2.9 x 10-6

D

150

3.5 x 10-6

D

175

5.4 x 10-6

D

205

7.6 x 10-6

D

225

8.0 x 10-6

D

225

7.3 x 10-6

D

250

1.06 x 10-5

D

400

2.72 x 10-5