Order-disorder in 1:1 type clay minerals by solid-state27Al and29Si magic-angle-spinning NMR spectroscopy
- 1 September 1985
- journal article
- Published by Mineralogical Society in Clay Minerals
- Vol. 20 (3) , 327-334
- https://doi.org/10.1180/claymin.1985.020.3.05
Abstract
The applicability of27Al and29Si magic-angle-spinning nuclear magnetic resonance (MASNMR) spectroscopy to the investigation of order-disorder in 1 : 1 dioctahedral layer-silicates was tested.27Al and29Si MASNMR showed the existence of short-range order in all these systems while XRD showed different degrees of long-range order-disorder. Spectra obtained on kaolinite and metakaolin clearly showed the transformation of some octahedral Al in kaolinite to tetrahedral coordination in metakaolin and also showed short-range Al and Si disorder in the latter. This suggests that structural re-arrangement on thermal treatment can be monitored by this technique. These results further suggest that MASNMR can detect short-range order, which is complimentary to the information that XRD provides regarding long-range order.Keywords
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