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OBSERVATION OF TWO 4-COORDINATED Al SITES IN MONTMORILLONITE USING HIGH MAGNETIC FIELD STRENGTH ²⁷Al MQMAS NMR

¹ Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
² Nippon Steel Corporation, Advanced Technology Research Laboratory, 20-1 Shintomi, Futtsu City, Chiba 293-8511, Japan

^* E-mail address of corresponding author: yikeda{at}nr.titech.ac.jp

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.

Key Words: ²⁷Al MQMAS • High Magnetic Field Strength • Na-montmorillonite

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