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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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