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

Published online by Cambridge University Press:  01 January 2024

Takahiro Ohkubo ,
Koji Kanehashi ,
Koji Saito  and
Yasuhisa Ikeda
Takahiro Ohkubo
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
Koji Kanehashi
Affiliation:
Nippon Steel Corporation, Advanced Technology Research Laboratory, 20-1 Shintomi, Futtsu City, Chiba 293-8511, Japan
Koji Saito
Affiliation:
Nippon Steel Corporation, Advanced Technology Research Laboratory, 20-1 Shintomi, Futtsu City, Chiba 293-8511, Japan
Yasuhisa Ikeda*
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
*
*E-mail address of corresponding author: yikeda@nr.titech.ac.jp
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Abstract

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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.

Keywords

27Al MQMASHigh Magnetic Field StrengthNa-montmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 5 , October 2003 , pp. 513 - 518
Copyright
Copyright © 2003, The Clay Minerals Society

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