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The intercalation of CsF in kaolinite

Published online by Cambridge University Press:  09 July 2018

I. Lapides ,
S. Yariv  and
N. Lahav
I. Lapides
Affiliation:
Deartment of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
S. Yariv
Affiliation:
Deartment of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
N. Lahav
Affiliation:
The Seagram Center for Soils and Water Research, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
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Abstract

Caesium aluminium silicates, caesium aluminium fluoride and aluminium fluoride were identified in a mixture obtained through the evaporation of kaolinite aqueous suspension with CsF. The mixture was studied by X-ray powder diffraction and IR spectroscopy. Two types of intercalation complexes of kaolinite were identified (A and B) which were characterized by c-spacings of ∼0.99 and 0.83 nm, respectively. Complex A seems to be an hydrated CsF intercalation complex, whereas complex B is a water intercalation complex, probably containing H3O+ and F−. It showed an IR absorption band at 3518 cm−1. The c-spacings of similar CsCl and CsBr complexes depend on the ionic radii. The intercalated ions are keyed into the ditrigonal cavities of the oxygen plane. A straight line plot of the keying values versus the ionic size indicates that keying is high for F−and decreases with increasing ionic size.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 4 , December 1995 , pp. 287 - 294
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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