Abstract
The tracer diffusion coefficient of tritium in Nb has been measured at 523 K under the condition that tritium coexists with protium or deuterium. These data suggest the trend that the tracer diffusion coefficient of tritium in NbH x T y is somewhat larger than that in NbD x T y , though a definite conclusion has been reserved because their difference is small and comparable to the scattering of the experimental data. The concentration dependence of tracer diffusion coefficient of tritium in NbH x T y and NbD x T y can be practically considered to be equal to that of NbT x . On the basis of these experimental data and the data reported by Fukai et al., it has been suggested that the tracer diffusion coefficient of lighter hydrogen isotopes is appreciably influenced by coexisting heavier hydrogen isotopes but that of heavier hydrogen isotopes is scarcely influenced by coexisting lighter hydrogen isotopes.
Published Version
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