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1 results

  • Observation of Two 4-Coordinated Al Sites in Montmorillonite using High Magnetic Field Strength 27Al MQMAS NMR

  • Takahiro Ohkubo, Koji Kanehashi, Koji Saito, Yasuhisa Ikeda
  • Journal:
    Clays and Clay Minerals / Volume 51 / Issue 5 / October 2003
    Published online by Cambridge University Press:
    01 January 2024, pp. 513-518
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  • Analyses of the layer structure of Na-montmorillonite have been performed using 27Al MAS and 27Al MQMAS NMR techniques. Results of 27Al MAS NMR measurements at higher magnetic field strength (16.4 T) suggest that the 4-coordinated Al site in Na-montmorillonite has two different structures. This was confirmed by the fact that two peaks corresponding to 4-coordinated Al are observed in the 27Al MQMAS NMR at high magnetic field strength. The ratio of two 4-coordinated Al sites was found to be affected by water in the interlayer space because the area ratio of cross peaks corresponding to two 4-coordinated Al sites changes with the water content.