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Author Stroud, R. M. ♦ Viano, A. M. ♦ Gibbons, P. C. ♦ Kelton, K. F. ♦ Misture, S. T.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword HYDROGEN FUEL ♦ MATERIALS SCIENCE ♦ HYDROGEN STORAGE ♦ TITANIUM BASE ALLOYS ♦ CRYSTAL STRUCTURE ♦ ZIRCONIUM ALLOYS ♦ NICKEL ALLOYS ♦ HYDRIDES ♦ X-RAY DIFFRACTION ♦ DESORPTION ♦ OXIDATION ♦ PHASE STUDIES ♦ QUASICRYSTALS ♦ XRD
Abstract The desorption of hydrogen from a novel material, a Ti{sub 45}Zr{sub 38}Ni{sub 17}-H quasicrystal, was observed using high-temperature powder x-ray diffraction, demonstrating the potential utility of Ti-based quasicrystals in place of crystalline or amorphous hydrides for hydrogen storage applications. The maximum observed change in hydrogen concentration was from 61 at.{percent}, corresponding to a hydrogen-to-metal ratio (H/M) of 1.54, at 91{degree}C to less than 2.5 at.{percent} (H/M=0.025) at 620{degree}C. The onset temperature of desorption is below 350{degree}C. Surface oxidation was found to promote the formation of crystalline hydride phases. Highly oxidized samples transformed to a mixture of the C14 Laves and C15 Laves crystalline hydrides, and the Ti{sub 2}Ni phase. When the oxidation was less severe, a reversible transformation between the quasicrystal and crystalline hydride phases was clearly observed, demonstrating the stability of the Ti{sub 45}Zr{sub 38}Ni{sub 17} quasicrystal at very low hydrogen concentrations, and temperatures as high as 661{degree}C. This is the first evidence for a stable Ti-based quasicrystal and for reversible hydrogen storage in a quasicrystalline phase. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Department Oak Ridge National Laboratory
Publisher Place United States
Journal Applied Physics Letters
Volume Number 69
Issue Number 20
Organization Oak Ridge National Laboratory


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