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Clay Minerals; June 2000; v. 35; no. 3; p. 545-557
© 2000 Mineralogical Society of Great Britain and Ireland
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Research Paper

Mean thickness and thickness distribution of smectite crystallites

K. MYSTKOWSKI1,*, J. SRODON2 and F. ELSASS3

1 Dept. of Mineralogy, Geochemistry and Petrography, University of Mining and Metallurgy, Mickiewicza 30, 30-059 Kraków, Poland,2 Institute of Geological Sciences PAN, Senacka 1, 31-002 Kraków, Poland, and3 Station de Science du Sol INRA, Route de St-Cyr, 78000 Versailles, France

* E-mail: ndmystko{at}geolog.geol.agh.edu.pl

(Received 15 December 1998; revised 22 November 1999)

A series of smectites was investigated to reveal the thickness distribution of crystallites. The Fourier decomposition technique of Bertaut-Warren-Averbach (MudMaster program) was applied to XRD reflections of <0.2 µm, glycolated Na-clays. It was shown that the thickness distribution is lognormal and the mean thickness ranges from 5.7 to 12.3 nm (3.4–7.3 layers). At higher humidities, characteristic of TEM sample preparation, the mean thicknesses decrease, but the differences in mean thickness between samples are preserved. Beidellites have the thickest crystallites. The relationships between the mean thickness, volume-weighted mean thickness and the parameters of the lognormal distribution were established. Calculation of these parameters is possible, using the area and the maximum intensity of the 001 reflection. The influence of the fluctuations of d-spacing on the peak width was shown. Smectite crystallites, dispersed into individual layers during infinite osmotic swelling and rebuilt through coagulation, recover their original mean thickness and thickness distribution.

KEYWORDS: crystallite, smectite, mean thickness, Bertaut-Warren-Averbach




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