Back
Full-text
Journal article

Inelastic neutron scattering evidence for anomalous H-H distances in metal hydrides.

  • Borgschulte A Swiss Federal Laboratories for Materials Science and Technology (Empa), Laboratory for Advanced Analytical Technologies, CH-8600 Dübendorf, Switzerland; rhemley@uic.edu andreas.borgschulte@empa.ch.
  • Terreni J Swiss Federal Laboratories for Materials Science and Technology (Empa), Laboratory for Advanced Analytical Technologies, CH-8600 Dübendorf, Switzerland.
  • Billeter E Swiss Federal Laboratories for Materials Science and Technology (Empa), Laboratory for Advanced Analytical Technologies, CH-8600 Dübendorf, Switzerland.
  • Daemen L Spallation Neutron Source, Neutron Spectroscopy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475.
  • Cheng Y Spallation Neutron Source, Neutron Spectroscopy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475.
  • Pandey A Spallation Neutron Source, Neutron Spectroscopy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475.
  • Łodziana Z Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland.
  • Hemley RJ Department of Physics, University of Illinois at Chicago, Chicago, IL 60607; rhemley@uic.edu andreas.borgschulte@empa.ch.
  • Ramirez-Cuesta AJ Spallation Neutron Source, Neutron Spectroscopy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475.
Show more…
  • 2020-02-08
Published in:
  • Proceedings of the National Academy of Sciences of the United States of America. - 2020
Switendick criterion
diffusion
hydrogen correlation
inelastic neutron scattering
intermetallic hydrides
English Hydrogen-containing materials are of fundamental as well as technological interest. An outstanding question for both is the amount of hydrogen that can be incorporated in such materials, because that determines dramatically their physical properties such as electronic and crystalline structure. The number of hydrogen atoms in a metal is controlled by the interaction of hydrogens with the metal and by the hydrogen-hydrogen interactions. It is well established that the minimal possible hydrogen-hydrogen distances in conventional metal hydrides are around 2.1 Å under ambient conditions, although closer H-H distances are possible for materials under high pressure. We present inelastic neutron scattering measurements on hydrogen in [Formula: see text] showing nonexpected scattering at low-energy transfer. The analysis of the spectra reveals that these spectral features in part originate from hydrogen vibrations confined by neighboring hydrogen at distances as short as 1.6 Å. These distances are much smaller than those found in related hydrides, thereby violating the so-called Switendick criterion. The results have implications for the design and creation of hydrides with additional properties and applications.
Language
  • English
Open access status
bronze
Identifiers
Persistent URL
https://sonar.ch/global/documents/19617
Statistics
Document views: 31 File downloads:
  • Full-text: 0