Abstract
The dependence of the electric field gradients (EFGs) in the Hf-doped LaNi 5-hydrogen system, as a function of hydrogen composition ratio ( X), has been investigated in the range 0≤ X≤5.7 using the Time Differential Perturbed Angular Correlation (TDPAC) technique. The TDPAC spectrum of LaNi 5 was fitted with a single EFG, while two EFGs were needed to fit the LaNi 5H x spectra. The first EFG was similar to the one found in metallic LaNi 5 and the second one was interpreted as related to those probe atoms located in the basal plane next to hydrogen interstitial sites located in the same plane. The relative fraction of the probe atoms experiencing these EFGs is dependent on the relative occupation of hydrogen in these sites.
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