Abstract
The influence of H and D on the internal friction of nanocrystalline Pd was studied in vibrating-reed experiments (temperatures between 5 and 250 K; frequencies between 300 and 2000 Hz, H and D concentrations of about 2 and about 4 at.%). The data demonstrate a strong H- or D-induced internal-friction peak at around 160 K. The comparison with literature results for H-doped ordinary coarse-grained or single-crystal Pd suggests that the peak is caused by a Snoek-Köster relaxation of H or D atoms in the grains of the nanocrystalline Pd. The data show further a relaxation at around 70 K which is probably due to relaxation processes of H or D atoms in the grain boundaries.
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