Crystal structural studies of AB5-type, BCC and Zintl phase hydrogen absorbing alloys

Etsuo Akiba, Hirotoshi Enoki, Yumiko Nakamura

Research output: Contribution to journalArticle

6 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. 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 strain observed for LaNi5 was not found at the first absorption but a reversible stain parallel to the c-axis was observed in desorption. The crystal structure of Laves phase related BCC alloys and their hydrides was refined by the Rietveld method using in-situ X-ray and neutron powder diffraction data. It was confirmed that these alloys had BCC structure, which means constituent elements occupy the BCC sites randomly. A new class of hydride with Zintl anion was found and the crystal structure of hydride/deuteride was refined using neutron diffraction.

Original languageEnglish
Pages (from-to)321-324
Number of pages4
JournalMaterials Science and Engineering A
Volume329-331
DOIs
Publication statusPublished - Jun 1 2002

Fingerprint

Hydrides
hydrides
Hydrogen
Crystals
hydrogen
crystals
Crystal structure
deuterides
Rietveld method
crystal structure
Neutron powder diffraction
Laves phases
Dehydrogenation
Neutron diffraction
dehydrogenation
diffraction
X ray powder diffraction
Hydrogenation
hydrogenation
Intermetallics

All Science Journal Classification (ASJC) codes

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

Cite this

Crystal structural studies of AB5-type, BCC and Zintl phase hydrogen absorbing alloys. / Akiba, Etsuo; Enoki, Hirotoshi; Nakamura, Yumiko.

In: Materials Science and Engineering A, Vol. 329-331, 01.06.2002, p. 321-324.

Research output: Contribution to journalArticle

Akiba, Etsuo ; Enoki, Hirotoshi ; Nakamura, Yumiko. / Crystal structural studies of AB5-type, BCC and Zintl phase hydrogen absorbing alloys. In: Materials Science and Engineering A. 2002 ; Vol. 329-331. pp. 321-324.
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