The isotope effect for the diffusion of H, D and T in body-centered cubic Nb was measured by using the Gorsky effect. It was found that the data could be represented by Arrhenius relationships at temperatures ranging from 190 to 310K (table 86). The DH/DD ratio was much larger than the classical value of √2, and exhibited a strong temperature-dependence. The DD/DT ratio was slightly larger than √(3/2) and was relatively temperature-independent.

G.Matusiewicz, H.K.Birnbaum: Journal of Physics F, 1977, 7[11], 2285-9

 

Table 86

Isotope Effect for H Diffusion in Nb

 

Isotope

Temperature (K)

C (at%)

Do (cm2/s)

E (eV)

H

190-310

0.11

1.63 x 10-4

0.080

H

190-310

0

1.63 x 10-4

0.080

D

233-310

0.90

5.95 x 10-4

0.135

D

233-310

0

5.94 x 10-4

0.133

T

233-310

0.93

4.46 x 10-4

0.137

T

233-310

0

4.45 x 10-4

0.135