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Structure and Hydrogenation Properties of a HfNbTiVZr High-Entropy Alloy
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Uppsala Univ, Dept Chem, Angstrom Lab, Box 523, SE-75120 Uppsala, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Uppsala Univ, Dept Chem, Angstrom Lab, Box 523, SE-75120 Uppsala, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Uppsala Univ, Dept Chem, Angstrom Lab, Box 523, SE-75120 Uppsala, Sweden..ORCID iD: 0000-0003-0336-2560
Univ Paris Est, Inst Chim & Mat Paris Est, CNRS, UPEC,UMR7182, 2-8 Rue Henri Dunant, F-94320 Thiais, France..
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2018 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 57, no 4, p. 2103-2110Article in journal (Refereed) Published
Abstract [en]

A high-entropy alloy (HEA) of HfNbTiVZr was synthesized using an arc furnace followed by ball milling. The hydrogen absorption mechanism was studied by in situ X-ray diffraction at different temperatures and by in situ and ex situ neutron diffraction experiments. The body centered cubic (BCC) metal phase undergoes a phase transformation to a body centered tetragonal (BCT) hydride phase with hydrogen occupying both tetrahedral and octahedral interstitial sites in the structure. Hydrogen cycling of the alloy at 500 degrees C is stable. The large lattice strain in the HEA seems favorable for absorption in both octahedral and tetrahedral sites. HEAs therefore have potential as hydrogen storage materials because of favorable absorption in all interstitial sites within the structure.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 57, no 4, p. 2103-2110
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Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-348913DOI: 10.1021/acs.inorgchem.7b03004ISI: 000426014800044PubMedID: 29389120OAI: oai:DiVA.org:uu-348913DiVA, id: diva2:1201291
Funder
Swedish Foundation for Strategic Research Danish National Research FoundationAvailable from: 2018-04-25 Created: 2018-04-25 Last updated: 2018-04-25Bibliographically approved

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Karlsson, DennisEk, GustavCedervall, JohanJansson, UlfSahlberg, Martin

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