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

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Clays and Clay Minerals

Abstract

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.

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Authors and Affiliations

  1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan

    Takahiro Ohkubo & Yasuhisa Ikeda

  2. Nippon Steel Corporation, Advanced Technology Research Laboratory, 20-1 Shintomi, Futtsu City, Chiba, 293-8511, Japan

    Koji Kanehashi & Koji Saito

Authors
  1. Takahiro Ohkubo
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  2. Koji Kanehashi
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  3. Koji Saito
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  4. Yasuhisa Ikeda
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Correspondence to Yasuhisa Ikeda.

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Ohkubo, T., Kanehashi, K., Saito, K. et al. Observation of Two 4-Coordinated Al Sites in Montmorillonite using High Magnetic Field Strength 27Al MQMAS NMR. Clays Clay Miner. 51, 513–518 (2003). https://doi.org/10.1346/CCMN.2003.0510505

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  • DOI: https://doi.org/10.1346/CCMN.2003.0510505

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