SEM and TEM characterization of magnesium hydride catalyzed with Ni nano-particle or Nb2O5

Nobuko Hanada, Enoki Hirotoshi, Takayuki Ichikawa, Etsuo Akiba, Hironobu Fujii

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

The microstructures of MgH2 catalyzed with Ni nano-particle or Nb2O5 mesoporous powders are examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. For MgH2 catalyzed with Ni, the Ni particles with the diameter smaller than 1 μm were detected on the MgH2 particles with the diameter smaller than 5 μm by the back scattering electron (BSE) microscopy. In details, the TEM micrograph indicates that the Ni particles distribute ∼20 nm in diameter on MgH2 uniformly, which was the same size as the additive doped in MgH2 before milling. On the other hand, for MgH2 catalyzed with Nb2O5, the additive particles could not be found anywhere in the BSE image. Even in the TEM micrograph by much larger magnification than the SEM micrograph, the particles corresponding to the additive cannot be observed at all. Furthermore, an energy dispersive X-ray (EDX) analysis in spots with a diameter of 20 nm indicated that the existing ratio of Mg to Nb was evaluated to 98:2, being the same as the starting ratio before milling. Therefore, the metal oxide Nb2O5 becomes extremely small particle that could not be observed by the present work after milling compared to metal Ninano.

Original languageEnglish
Pages (from-to)395-399
Number of pages5
JournalJournal of Alloys and Compounds
Volume450
Issue number1-2
DOIs
Publication statusPublished - 2008 Feb 14

Keywords

  • Ball-milling
  • Hydrogen absorbing materials
  • Microstructure
  • Scanning electron microscopy (SEM)
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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