The vibrational excitations and the position of hydrogen in nanocrystalline palladium

The vibrational excitations and the position of H in nanocrystalline Pd were investigated by means of inelastic neutron-scattering and H solubility measurements. The study focuses on the H concentration regime ( < =4.8 at.% H) where, at room temperature, no precipitation of the H in a hydride pha...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 1995-01, Vol.7 (2), p.219-230
Main Authors: Stuhr, U, Wipf, H, Udovic, T J, Weissmuller, J, Gleiter, H
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Metals. Metallurgy
Phonon-defect interactions
Phonon-electron and phonon-phonon interactions
Phonons and vibrations in crystal lattices
Physics
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Summary:The vibrational excitations and the position of H in nanocrystalline Pd were investigated by means of inelastic neutron-scattering and H solubility measurements. The study focuses on the H concentration regime ( < =4.8 at.% H) where, at room temperature, no precipitation of the H in a hydride phase ( beta -phase) was observed. In the concentration regime, the solubility measurements shown an enhanced H solubility relative to coarse-grained Pd. The neutron-scattering experiments show that this additional H is incorporated in the grain boundaries and at the surface of the grains. Surface modes of H at approx90 and 120 meV were identified. Compared to coarse-grained Pd, no change in the H solubility was found for the crystal lattice of the nanosized grains.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/7/2/002