Neutron holography of metal–hydrogen systems

Neutron holography constitutes a novel technique to obtain structural information on an atomic scale. It is based on the recording of the interference pattern of neutron waves coherently scattered by atomic nuclei located on a crystal lattice with an appropriate reference wave. The technique is part...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-12, Vol.404, p.122-125
Main Authors: Cser, L., Krexner, G., Prem, M., Sharkov, I., Török, Gy
Format: Article
Language:English
Subjects:
Crystal structure
Hydrogen storage materials
Metals
Neutron scattering
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Summary:Neutron holography constitutes a novel technique to obtain structural information on an atomic scale. It is based on the recording of the interference pattern of neutron waves coherently scattered by atomic nuclei located on a crystal lattice with an appropriate reference wave. The technique is particularly well suited to obtain holograms of metal–hydrogen systems. In one approach, a point-like source of spherical neutron waves is realized inside a single-crystalline sample by making use of the large incoherent neutron scattering cross section of hydrogen nuclei, i.e. protons. Alternatively, strongly neutron-absorbing nuclei can be used as point-like detectors within a sample. Various features of the method are explained referring to a recent holographic reconstruction of the positions of the metal atoms around hydrogen on octahedral interstitial sites in a palladium–hydrogen single crystal. Further, the potential of the method for the investigation of metal–hydrogen systems, in general, is discussed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.03.110