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Solid state NMR characterization of the thermal transformation of an illite-rich clay

Roch, G.E., Smith, Mark E., Drachman, S.R. (1998) Solid state NMR characterization of the thermal transformation of an illite-rich clay. Clays and Clay Minerals, 46 (6). pp. 694-704. ISSN 0009-8604. (doi:10.1346/ccmn.1998.0460610) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:17060)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
https://doi.org/10.1346/ccmn.1998.0460610

Abstract

Lode, a dioctahedral illite-rich clay from Latvia belonging to the mica group of clay minerals, undergoes thermal transformation via a series of structurally disordered intermediate phases. Despite containing high levels of paramagnetic Fe substituted into the octahedral sites. Si-29 and Al-27 magic angle spinning nuclear magnetic resonance (MAS NMR) spectra of sufficient quality are obtained to resolve different structural units, showing clearly defined structural changes which occur in the sample during calcination to 1200 degrees C. However, Fe plays a significant role in broadening the Al signal, with integrated peak intensities decreasing as temperature increases. Significant differences are revealed in the thermal decomposition process by NMR spectra between pyrophyllite, Ca-montmorillonite and illite clays, possibly due to the different cations present in the interlayer. It has also been shown for illite that no structural differences at the atomic level occur when the dwell time at a particular temperature is varied and no difference is observed between samples that have different thermal histories: however, a minor effect of particle size and surface area is visible in the NMR data.

Item Type: Article
DOI/Identification number: 10.1346/ccmn.1998.0460610
Uncontrolled keywords: illite; iron; paramagnetic center; solid-state NMR; thermal transformation
Subjects: Q Science > QH Natural history > QH541 Ecology
Q Science > QE Geology
T Technology > TN Mining engineering. Metallurgy
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Tara Puri
Date Deposited: 04 Jul 2009 14:36 UTC
Last Modified: 09 Mar 2023 11:31 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/17060 (The current URI for this page, for reference purposes)

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