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27Al MAS-NMR spectra of alumina aerogels

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Abstract

The 27Al MAS-NMR spectra of alumina aerogels were determined. The spectra showed different profiles according to the supercritical methods used during drying. The alumina aerogel supercritically dried in a CO2 extractor (80 °C, 15.7 MPa) displayed a pentahedral-coordinated aluminum structure. On the other hand, the alumina aerogel supercritically dried in an autoclave (270 °C, 26.5 MPa) revealed no pentahedral-coordinated aluminum structure. The absence of pentahedral-coordinated aluminum was one factor for the lower temperature of transformation from the γ to the θ phase.

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References

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Author notes

  1. Makoto Hori

    Present address: Kurosaki Refractories Co., 1-1, Higashihama, Yawata-nishi, 806, Kitakyushu, Japan

  2. Minoru Sasaki

    Present address: R & D Laboratories-I, Central R & D Bureau, Nippon Steel Corp., 1618 Ida, Nakahara-ku, 211, Kawasaki, Japan

Authors and Affiliations

  1. Colloid Research Institute, 350-1 Ogura, Yahatahigashi-ku, 805, Kitakyushu, Japan

    Yasuyuki Mizushima, Makoto Hori & Minoru Sasaki

  2. Superconductivity Research Laboratory, c/o Japan Fine Ceramics Center, 4-1 Mutsuno 2-Chome, Atsuta-ku, 456, Nagoya, Japan

    Yasuyuki Mizushima

Authors
  1. Yasuyuki Mizushima
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  2. Makoto Hori
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  3. Minoru Sasaki
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Mizushima, Y., Hori, M. & Sasaki, M. 27Al MAS-NMR spectra of alumina aerogels. Journal of Materials Research 8, 2109–2111 (1993). https://doi.org/10.1557/JMR.1993.2109

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  • DOI: https://doi.org/10.1557/JMR.1993.2109

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