Neutron scattering study of the vibrational behaviour of H-doped nanocrystalline Pd

The local vibrational density of states (VDOS) of the interfaces and the la ttice regions of nanocrystalline Pd were investigated by neutron spectrosco py. Hydrogen was used as a probe for the VDOS of the interfaces, whereas th e Pd spectra represent the scattering of the lattice regions. These two con tributions were separated from each other with neutron spin analysis. The n eutron spectra of the interfaces below 10 meV can be described with a linea r local VDOS whereas the lattice atoms show a quadratic Debye VDOS. (C) 200 0 Elsevier Science B.V. All rights reserved.