Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys

E. Akiba; H. Enoki; Y. Nakamura

doi:10.1016/j.mseb.2003.10.104

Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys

E. Akiba, H. Enoki, Y. Nakamura

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Our progress on crystal structural studies on hydrogen absorbing alloys including intermetallics and solid solutions is reviewed. LaNi₅ shows an extremely high equilibrium pressure at the first hydrogen absorption but not at the second one. The structural change in the first absorption was followed by in-situ X-ray diffraction (XRD). We found that the crystalline size did not change but the anistropic strain was introduced to the lattice of the hydride formed. The strain introduced was not relaxed in the following dehydrogenation and hydrogenation. However, the behavior of LaNi_4.75Al_0.25 for the first absorption was completely different from LaNi₅. The stain observed for LaNi₅ was not found at the first absorption but reversible stain parallel to c-axis was observed in desorption.

Original language	English
Pages (from-to)	60-66
Number of pages	7
Journal	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume	108
Issue number	1-2
DOIs	https://doi.org/10.1016/j.mseb.2003.10.104
Publication status	Published - Apr 25 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.mseb.2003.10.104

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title = "Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys",

abstract = "Our progress on crystal structural studies on hydrogen absorbing alloys including intermetallics and solid solutions is reviewed. LaNi5 shows an extremely high equilibrium pressure at the first hydrogen absorption but not at the second one. The structural change in the first absorption was followed by in-situ X-ray diffraction (XRD). We found that the crystalline size did not change but the anistropic strain was introduced to the lattice of the hydride formed. The strain introduced was not relaxed in the following dehydrogenation and hydrogenation. However, the behavior of LaNi4.75Al0.25 for the first absorption was completely different from LaNi5. The stain observed for LaNi5 was not found at the first absorption but reversible stain parallel to c-axis was observed in desorption.",

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T1 - Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys

AU - Akiba, E.

AU - Enoki, H.

AU - Nakamura, Y.

PY - 2004/4/25

Y1 - 2004/4/25

N2 - Our progress on crystal structural studies on hydrogen absorbing alloys including intermetallics and solid solutions is reviewed. LaNi5 shows an extremely high equilibrium pressure at the first hydrogen absorption but not at the second one. The structural change in the first absorption was followed by in-situ X-ray diffraction (XRD). We found that the crystalline size did not change but the anistropic strain was introduced to the lattice of the hydride formed. The strain introduced was not relaxed in the following dehydrogenation and hydrogenation. However, the behavior of LaNi4.75Al0.25 for the first absorption was completely different from LaNi5. The stain observed for LaNi5 was not found at the first absorption but reversible stain parallel to c-axis was observed in desorption.

AB - Our progress on crystal structural studies on hydrogen absorbing alloys including intermetallics and solid solutions is reviewed. LaNi5 shows an extremely high equilibrium pressure at the first hydrogen absorption but not at the second one. The structural change in the first absorption was followed by in-situ X-ray diffraction (XRD). We found that the crystalline size did not change but the anistropic strain was introduced to the lattice of the hydride formed. The strain introduced was not relaxed in the following dehydrogenation and hydrogenation. However, the behavior of LaNi4.75Al0.25 for the first absorption was completely different from LaNi5. The stain observed for LaNi5 was not found at the first absorption but reversible stain parallel to c-axis was observed in desorption.

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Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys

Abstract

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