The migration of H and D was studied by monitoring a relaxation process which was related to long-range diffusion. It was found that the results, at 270 to 560K, could be described by:

H:     D (cm2/s) = 5.4 x 10-4 exp[-0.110(eV)/kT]

D:     D (cm2/s) = 5.6 x 10-4 exp[-0.135(eV)/kT]

G.Schaumann, J.Völkl, G.Alefeld: Physical Review Letters, 1968, 21[13], 891-3

 

Table 81

Diffusion of H in NbH0.033 at 297.6K

 

Pressure (bar)

Method

D (cm2/s)

1

summed spectra

6.787 x 10-6

5000

summed spectra

6.883 x 10-6

1

single spectra

6.586 x 10-6

5000

single spectra

6.688 x 10-6

 

Table 82

Parameters for D and H Diffusion in Nb

 

Isotope

Temperature (K)

Do (cm2/s)

E (eV)

D

120-600

5.4 x 10-4

0.129

H

120-300

9.0 x 10-5

0.068

H

300-600

5.0 x 10-4

0.106