U Stuhr et al 1995 J. Phys.: Condens. Matter 7 219 doi:10.1088/0953-8984/7/2/002
U Stuhr, H Wipf, T J Udovic, J Weissmuller and H Gleiter
Show affiliationsThe vibrational excitations and the position of hydrogen in nanocrystalline palladium were investigated by means of inelastic neutron-scattering and H solubility measurements. The study focuses on the H concentration regime (<or=4.8 at.% H) where, at room temperature, no precipitation of the H in a hydride phase ( beta -phase) was observed. In this concentration regime, the solubility measurements show 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 approximately 90 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.
78.70.Nx Neutron inelastic scattering
63.20.-e Phonons in crystal lattices
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Issue 2 (9 January 1995)
U Stuhr et al 1995 J. Phys.: Condens. Matter 7 219
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