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Rhodium dihydride (...
Rhodium dihydride (RhH(2)) with high volumetric hydrogen density
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Li, Bing (författare)
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Ding, Yang (författare)
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Kim, Duck Young (författare)
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- Ahuja, Rajeev (författare)
- Uppsala universitet,KTH,Tillämpad materialfysik,Materialteori
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Zou, Guangtian (författare)
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Mao, Ho-Kwang (författare)
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(creator_code:org_t)
- 2011-10-28
- 2011
- Engelska.
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 108:46, s. 18618-18621
- Relaterad länk:
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https://www.pnas.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Materials with very high hydrogen density have attracted considerable interest due to a range of motivations, including the search for chemically precompressed metallic hydrogen and hydrogen storage applications. Using high-pressure synchrotron X-ray diffraction technique and theoretical calculations, we have discovered a new rhodium dihydride (RhH(2)) with high volumetric hydrogen density (163.7 g/L). Compressing rhodium in fluid hydrogen at ambient temperature, the fcc rhodium metal absorbs hydrogen and expands unit-cell volume by two discrete steps to form NaCl-typed fcc rhodium monohydride at 4 GPa and fluorite-typed fcc RhH(2) at 8 GPa. RhH(2) is the first dihydride discovered in the platinum group metals under high pressure. Our low-temperature experiments show that RhH(2) is recoverable after releasing pressure cryogenically to 1 bar and is capable of retaining hydrogen up to 150 K for minutes and 77 K for an indefinite length of time.
Nyckelord
- metal hydrides
- phase transition
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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