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De-intercalated kaolinites: The nature of created defects and estimation of structural characteristics by the expert system of Plançon and Zacharie

Published online by Cambridge University Press:  09 July 2018

M. A. Plastinina ,
Ju. G. Fedorenko  and
A. A. Shpigun
M. A. Plastinina
Affiliation:
Institute of Geochemistry and Physics of Minerals, Academy of Science of the Ukraine, Kiev, Ukraine
Ju. G. Fedorenko
Affiliation:
Institute of Geochemistry and Physics of Minerals, Academy of Science of the Ukraine, Kiev, Ukraine
A. A. Shpigun
Affiliation:
Institute of Geochemistry and Physics of Minerals, Academy of Science of the Ukraine, Kiev, Ukraine
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Abstract

Initial and de-intercalated (by washing with water from formamide molecules) kaolinite was investigated by X-ray and IR spectroscopic methods. As a result of de-intercalation by water washing, changes in structural characteristics and in some physical-chemical properties of kaolinites take place: (1) the content of low-defect phase (%ldp) evaluated by the expert system of Plançon & Zacharie (1990) decreases; (2) the degree of order of the structure as determined by the Hinckley index decreases; (3) the size of coherent scattering regions (CSR) determined by the method of fourth moments decrease; (4) the rate of repeated introduction of the formamide molecules to the interlayer increases. The cause of these changes are water molecules introduced into the kaolinite interlayer as a result of de-intercalation. These water molecules have IR absorption bands at 3646 (vas), 3550 (vs) and 1650 (vα) cm-1. The results obtained are discussed in relation to modern ideas on disorder models of kaolinite crystals.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 1 , March 1993 , pp. 101 - 108
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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