Muon spin relaxation reveals the hydrogen storage mechanism in light alkali metal fullerides

We report a muon spin relaxation investigation of Li6C60 and Na10C60 fullerides, which have been recently demonstrated to be efficient and reversible H2 absorbers above 570K. We prove that, differently from other fullerides, a sizeable fraction of implanted muons form C60 muonium adduct radicals, wi...

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Bibliographic Details
Published in:Carbon (New York) 2014-02, Vol.67, p.92-97
Main Authors: Aramini, M., Gaboardi, M., Vlahopoulou, G., Pontiroli, D., Cavallari, C., Milanese, C., Riccò, M.
Format: Article
Language:English
Subjects:
Alkali metals
Alternative fuels. Production and utilization
Applied sciences
Buckminsterfullerene
Carbon
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Energy
Exact sciences and technology
Fuels
Fullerenes
Fullerenes and related materials
diamonds, graphite
Fullerides
Hydrogen
Hydrogen storage
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Materials science
Muon spin relaxation
Muon spin rotation and relaxation
Physics
Radicals
Specific materials
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Summary:We report a muon spin relaxation investigation of Li6C60 and Na10C60 fullerides, which have been recently demonstrated to be efficient and reversible H2 absorbers above 570K. We prove that, differently from other fullerides, a sizeable fraction of implanted muons form C60 muonium adduct radicals, with hyperfine coupling depending on the C60 hydrogen coverage. Surprisingly, the fraction of radicals was found to increase up to 65% when lowering T to 5K in Na10C60Hy. This indicates that hydrogen interaction in these systems is enhanced even at cryogenic temperatures, while the high T needed for hydrogen absorption is only required to overcome the H2 dissociation barrier mediated by alkali metals.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.09.063