The migration of D and H was measured by using a steady-state method. It was found that both isotopes moved towards the cooler end. The heat of transport of H was equal to 43.3kJ/mol for temperatures of between 370 and 430C, while the heat of transport of D was equal to 53.0kJ/mol for temperatures of between 360 and 420C.

Thermomigration of Hydrogen and Deuterium in Vanadium, its Alloys, Niobium and Tantalum. H.Nakajima, M.Yoshioka, M.Koiwa: Transactions of the Japan Institute of Metals, 1987, 28[12], 949-56

 

Table 166

Diffusivity, Mobility and Effective Charge of H in Ta

 

Temperature (C)

m (cm2/Vs)

D (cm2/s)

Z*(e)

26

2.0 x 10-5

1.73 x 10-6

0.3

50

4.6 x 10-5

2.5 x 10-6

0.5

100

7.9 x 10-5

4.2 x 10-6

0.6

150

1.09 x 10-4

6.8 x 10-6

0.6

250

2.6 x 10-4

1.5 x 10-5

0.8

600

1.25 x 10-3

6.1 x 10-5

1.5