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Dynamics of hydrogen in Pr2Fe17H4 and Pr2Fe17H5

Published online by Cambridge University Press:  01 February 2011

Eugene Mamontov ,
Terrence J Udovic ,
John J Rush  and
Olivier Isnard
Eugene Mamontov
Affiliation:
mamontov@nist.gov, NIST Center for Neutron Research, 100 Bureau Dr.,, MS 8562, Gaithersburg, MD, 20899-8562, United States
Terrence J Udovic
Affiliation:
udovic@nist.gov, NIST Center for Neutron Research, United States
John J Rush
Affiliation:
jack.rush@nist.gov, NIST Center for Neutron Research, United States
Olivier Isnard
Affiliation:
olivier.isnard@grenoble.cnrs.fr, CNRS, France
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Abstract

We describe a study of the dynamics of hydrogen in Pr2Fe17H4, where isolated hexagons formed by the interstitial tetrahedral (t) sites of the metal lattice are populated by mobile hydrogen atoms. An activation energy of 0.10 eV has been determined for a localized jump process involving the hopping of these hydrogen atoms among adjacent vertices of each hexagon, slightly lower than that for hydrogen hopping in Pr2Fe17H5, where each hexagon is occupied by two hydrogen atoms.

Keywords

Hdiffusionneutron scattering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 885: Symposium A – The Hydrogen Cycle – Generation, Storage and Fuel Cells , 2005 , 0885-A08-07
Copyright
Copyright © Materials Research Society 2006

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References

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