The self-diffusivity of H in the body-centered cubic VHx phase, where x ranged from 0.17 to 0.68, was studied at temperatures of 435 to 620K by using the nuclear magnetic resonance alternating pulsed field-gradient spin-echo technique. It was found that the results could be described by using Arrhenius relationships, where the activation energy depended markedly upon the H content, while the pre-exponential factor was essentially constant (table 260).

J.E.Kleiner, E.H.Sevilla, R.M.Cotts: Physical Review B, 1986, 33[10], 6662-5

 

Table 260

Parameters for H Diffusion in VHx

 

x

Do (cm2/s)

E (eV)

0.17

4.3 x 10-4

87

0.22

4.0 x 10-4

89

0.31

3.8 x 10-4

89

0.38

4.4 x 10-4

106

0.51

5.2 x 10-4

121

0.68

4.7 x 10-4

132