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27Al Satellite Transition MAS-NMR Spectroscopy of Kaolinite

  • J. Rocha (a1) and J. D. Pedrosa De Jesus (a1)

Abstract

Highly crystalline kaolinite has been studied by 27Al satellite transition magic angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. This technique provides an additional narrowing of the MAS spectral lines by a factor of more than three compared with the width of the prominent central transition. Evidence for the presence of two crystallographically inequivalent hexacoordinated Al sites has been found. The results support the kaolinite crystal structure proposed by Bish & Von Dreele (1989).

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References

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Bish, D.L. & Von Dreele, R.B. (1989) Rietveld refinement of non-hydrogen atomic positions in kaolinite. Clays Clay Miner, 37, 289296.
Engelhardt, G. & Michel, D. (1987) High-resolution Solid State NMR of Silicates and Zeolites. J. Wiley, New York.
Jäger, C., Rocha, J. & Klinowski, J. (1992) High-speed satellite transition 27A1 MAS NMR spectroscopy. Chem. Phys. Lett, 188, 208212.
Jakobsen, H.J., Skibsted, J., Bildsøe, H. & Nielsen, N.C. (1989) Magic-angle spinning NMR spectra of satellite transitions for quadrupolar nuclei in solids. J. Magn. Reson, 85, 173180.
Rocha, J. & Klinowski, J. (1990) Kaolinite as a convenient standard for setting the Hartmann-Hahn match for 29Si CP/MAS NMR of silicates. J. Magn. Reson, 90, 567568.
Samoson, A. (1985) Satellite transition high-resolution NMR of quadrupolar nuclei in powders. Chem. Phys. Lett, 119, 2932.
Skibsted, J., Nielsen, N.C., Bildsøe, H. & Jakobsen, H.J. (1991) Satellite transitions in MAS NMR spectra of quadrupolar nuclei. J. Magn. Reson, 95, 88117.

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27Al Satellite Transition MAS-NMR Spectroscopy of Kaolinite

  • J. Rocha (a1) and J. D. Pedrosa De Jesus (a1)

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