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Vacancy analysis in a Ni-Nb-Zr-H glassy alloy by positron annihilation spectroscopy

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1 Author(s)
Fukuhara, Mikio ; Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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The positron lifetimes of Ni36Nb24Zr40 and (Ni0.36Nb0.24Zr0.40)90H10 glassy alloys are almost the same but longer than those of pure Zr, Nb, and Ni crystals, indicating that they have higher density of vacancies with smaller size than in crystals. The coincidence Doppler broadening spectrum for both specimens shows that the contribution of Ni around the vacancies is lower than that of Zr and Nb, suggesting that hydrogen atoms favour to exist between Ni atoms comprising neighboring distorted icosahedral Zr5Ni5Nb3 clusters. Thus, these results provide a substitute model of quantum dot tunneling along Ni–H–Ni atomic bond arrays among the clusters.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 9 )

Date of Publication:

Feb 2012

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