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29Si and 27Al MAS NMR spectroscopy of mullite

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Abstract

A 29Si and 27Al magic angle spinning nuclear magnetic resonance study is reported for differently synthesized mullites. The 29Si MAS NMR spectra of all samples are essentially identical. They consist of a main resonance at -86.8 ppm, a shoulder around -90 ppm and a second resonance at -94.2 ppm. The main resonance is interpreted as being due to a sillimanite-type geometry around Si and the second one is tentatively assigned to a Si environment typical for mullite. The 27Al MAS NMR spectra of sinter- and fused-mullite measured at different Larmor frequencies revealed clearly the presence of three distinct Al sites in mullite, i.e. of octahedral (M1), tetrahedral (M2) and distorted tetrahedral (Al*) sites.

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Authors and Affiliations

  1. Bayerisches Geoinstitut, Universität Bayreuth, Postfach 101251, W-8580, Bayreuth, Federal Republic of Germany

    L. H. Merwin & A. Sebald

  2. Institut für Mineralogie, Petrologie und Kristallographie der Universität, Hans-Meerwein-Strasse, W-3550, Marburg, Federal Republic of Germany

    H. Rager

  3. Deutsche Forschungsanstalt für Luft- und Raumfahrt, Institut für Werkstoff-Forschung, Postfach 906058, W-5000, Köln, Federal Republic of Germany

    H. Schneider

Authors
  1. L. H. Merwin
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  2. A. Sebald
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  3. H. Rager
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  4. H. Schneider
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Merwin, L.H., Sebald, A., Rager, H. et al. 29Si and 27Al MAS NMR spectroscopy of mullite. Phys Chem Minerals 18, 47–52 (1991). https://doi.org/10.1007/BF00199043

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  • DOI: https://doi.org/10.1007/BF00199043

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