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Journal of Materials Science

, Volume 41, Issue 9, pp 2679–2683 | Cite as

TEM observation of hydrogen permeable Si-M-O (M = Ni or Sc) membranes synthesized on mesoporous anodic alumina capillary tubes

  • S. Yamazaki
  • N. Uno
  • H. Mori
  • Y. H. Ikuhara
  • Y. Iwamoto
  • T. Kato
  • T. Hirayama
Article

Microstructures of Si-M-O (M = Ni or Sc; M/Si = 0.5) membranes synthesized on a mesoporous anodic alumina capillary (MAAC) tube using chemical processing techniques were characterized by transmission electron microscopy. The chemical composition of the membranes was analyzed by energy-dispersive X-ray spectroscopy. An as-synthesized Si-Ni-O membrane was found to be formed as a thin amorphous layer with a thickness of 400 nm on the MAAC tube, and in the mesopore channels of the MAAC tube, amorphous Si-Ni-O was also formed. The EDS analysis indicated a compositional gradient of Ni/Si for the Si-Ni-O membrane. The ratio of Ni/Si increased the further in depth from the surface of the membrane. After heat treatment in a hydrogen flow, a multilayered structure was formed, and nickel and nickel oxides were precipitated in the membrane. In the Si-Sc-O membrane, neither precipitation nor compositional gradient of Sc/Si were observed. The compositional change and precipitating behaviors of the Si-Ni-O and Si-Sc-O membrane are discussed in terms of the stability of the silica-dopant metal network and the hydrogen permselectivity of the membranes.

Keywords

Nickel Transmission Electron Microscopy Heat Treatment Processing Technique Capillary Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • S. Yamazaki
    • 1
    • 2
  • N. Uno
    • 1
  • H. Mori
    • 1
  • Y. H. Ikuhara
    • 1
  • Y. Iwamoto
    • 1
  • T. Kato
    • 1
  • T. Hirayama
    • 1
  1. 1.Materials R&D LaboratoryJapan Fine Ceramics CenterNagoyaJapan
  2. 2.Materials Research LaboratoryNGK Insulators, Ltd.NagoyaJapan

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