By using radio-tracer techniques, the diffusion of T in 3N-purity material at temperatures of 303 to 473K was found to be given by:
D (cm2/s) = 1.73 x 10-8 exp[-4.94(kJ/mol)/RT]
When electric fields of up to -0.05V/cm were applied, the effective charge on T was deduced to be 2.05e.
B.Rozenfeld, R.Pietrzak, B.Paszkiewicz, S.Sawicka: Nukleonika, 1973, 18[10], 439-46
Table 199
Parameters for H Diffusion in α-Zr, Zircaloy-2
and Zircaloy-4 at 300 to 700C
Material | Do (cm2/s) | E (kcal/mol) |
iodide Zr (longitudinal) | 6.94 x 10-3 | 10.58 |
sponge Zr (longitudinal) | 7.82 x 10-3 | 10.93 |
all longitudinal samples | 7.73 x 10-3 | 10.83 |
Zircaloy-4, transverse | 5.84 x 10-3 | 10.29 |
Zircaloy-4, normal | 7.90 x 10-3 | 10.73 |
all data combined | 7.00 x 10-3 | 10.65 |