Electron microscopy of Mg 2 Ni-H alloy synthesized by reactive mechanical grinding

Y. Kitano, Y. Fujikawa, N. Shimizu, Shin-Ichi Orimo, H. Fujii, T. Kamino, T. Yaguchi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A new material containing 1.6 wt.% of hydrogen (Mg 2 NiH 1.8 ) was synthesized by reactive mechanical grinding under hydrogen atmosphere by Orimo and Fujii [Orimo, S. and Fujii, H., J. Alloys and Compounds, 1996, 232, L16]. The microstructures of this alloy, Mg 2 NiH 1.8 , was investigated by high resolution transmission electron microscopy (HRTEM). It has been found from the HRTEM images that the texture mainly consists of nanocrystals of Mg 2 NiH x (x ≤ 0.3) with an average size of approximately 15 nm, and also found that heavily distorted regions exist around or between nanocrystals. The width or the thickness of these regions is thought to be approximately 1-2 nm. These results are consistent with the results deduced from the peak broadening of the X-ray diffraction pattern and magnetic analysis [Orimo S., Fujii, H. and Ikeda, K. Acta Metallurgica, accepted]. It is plausible to assume that these regions can contain an unexpected number of hydrogen atoms.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalIntermetallics
Volume5
Issue number2
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

Keywords

  • A. nanostructured intermetallics
  • B. hydrogen storage
  • C. mechanical alloying and milling
  • F. electron microscopy
  • Transmission

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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