TITLE

Hydrogen diffusion in MgH2 and NaMgH3 via concerted motions of charged defects

AUTHOR(S)
Shiqiang Hao; Sholl, David S.
PUB. DATE
December 2008
SOURCE
Applied Physics Letters;12/22/2008, Vol. 93 Issue 25, p251901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The transport properties of hydrogen in metal hydrides are crucial to the kinetics of H2 storage in these materials. We use first principles calculations to identify the defects that are relevant for H transport in MgH2 and NaMgH3. In both materials, the physically relevant defects are charged and H diffusion is dominated by mobility of negatively charged interstitial H. Moreover, the diffusion of these species occurs via concerted “interstitialcy” mechanisms with low energy barriers. Our results indicate that any examination of H diffusion in light metal hydrides must consider the concerted diffusion of charged defects.
ACCESSION #
36198010

 

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