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Metals 2016, 6(6), 125; doi:10.3390/met6060125

Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering

1
Department of Physics, California State University, San Bernardino, CA 92407, USA
2
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
3
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
4
School of Physics, The University of Western Australia, Crawley, WA 6009, Australia
5
Department of Physics and Materials Science, The City University of Hong Kong, Hong Kong
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 16 April 2016 / Revised: 13 May 2016 / Accepted: 17 May 2016 / Published: 24 May 2016
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
View Full-Text   |   Download PDF [3866 KB, uploaded 24 May 2016]   |  

Abstract

Due to hydrogen possessing a relatively large neutron scattering length, hydrogen absorption and desorption behaviors in metal thin films can straightforwardly be investigated by neutron reflectometry. However, to further elucidate the chemical structure of the hydrogen absorbing materials, complementary techniques such as high resolution X-ray reflectometry and diffraction remain important too. Examples of work on such systems include Nb- and Pd-based multilayers, where Nb and Pd both have strong affinity to hydrogen. W/Nb and Fe/Nb multilayers were measured in situ with unpolarized and polarized neutron reflectometry under hydrogen gas charging conditions. The gas-pressure/hydrogen-concentration dependence, the hydrogen-induced macroscopic film swelling as well as the increase in crystal lattice plane distances of the films were determined. Ferromagnetic-Co/Pd multilayers were studied with polarized neutron reflectometry and in situ ferromagnetic resonance measurements to understand the effect of hydrogen absorption on the magnetic properties of the system. This electronic effect enables a novel approach for hydrogen sensing using a magnetic readout scheme. View Full-Text
Keywords: hydrogen absorption; neutron reflectometry; polarized neutron reflectometry; thin films; multilayers hydrogen absorption; neutron reflectometry; polarized neutron reflectometry; thin films; multilayers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Callori, S.J.; Rehm, C.; Causer, G.L.; Kostylev, M.; Klose, F. Hydrogen Absorption in Metal Thin Films and Heterostructures Investigated in Situ with Neutron and X-ray Scattering. Metals 2016, 6, 125.

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