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The Intercalation of Kaolinite by Alkali Halides in the Solid State: A Systematic Study of the Intercalates and their Derivatives

Published online by Cambridge University Press:  28 February 2024

John G. Thompson ,
Neil Gabbitas  and
Philippa J. R. Uwins
John G. Thompson
Affiliation:
Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
Neil Gabbitas
Affiliation:
Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
Philippa J. R. Uwins
Affiliation:
Centre for Microscopy and Microanalysis, University of Queensland, QLD 4072, Australia
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Abstract

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Kaolinite: alkali halide intercalates have been successfully prepared by grinding the salt with kaolinite in the absence of water. Rate of intercalation is shown to correlate negatively with melting point of the salt. The basal dimensions of the intercalates increase with increasing size of the ion. As shown recently for kaolinite: NaCl intercalate, the layered structure survives the dehydroxylation of the kaolinite at 500°–600°C, at which point the excess alkali halide can be removed by rinsing to give an XRD-amorphous material. This amorphous material, of approximate stoichiometry MAlSiO4, reacts at surprisingly low temperatures to give crystalline phases, apparently of the same stoichiometry, with structures closely related to eucryptite (M = Li), carnegieite (M = Na), kalsilite (M = K), and leucite (M = K, Rb, Cs). The relationships between the structures of the reaction products are discussed.

Keywords

Alkali halideIntercalateKaoliniteStructureSynthesisXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 1 , February 1993 , pp. 73 - 86
Copyright
Copyright © 1993, The Clay Minerals Society

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