The influence of dissolved nitrogen on hydrogen diffusion in niobium studied by neutron spectroscopy

Abstract

Hydrogen diffusion was studied by quasielastic neutron scattering in the system alpha -NbH0.004 with 0.7 at.% nitrogen impurities, for temperatures between 180 and 373K. From comparing the spectra at small and at large scattering vectors, the trapping of the hydrogen in the vicinity of a dissolved nitrogen atom was studied. Typical trapping times are several hundred times larger than the mean rest time of a hydrogen atom on an undisturbed interstitial site.