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Determination of Layer-Charge Characteristics of Smectites

Published online by Cambridge University Press:  01 January 2024

G. E. Christidis  and
D. D. Eberl
G. E. Christidis*
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73100 Chania, Greece
D. D. Eberl
Affiliation:
US Geological Survey, 3215 Marine St., Suite E-127, Boulder, Colorado, 80303-1066, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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A new method for calculation of layer charge and charge distribution of smectites is proposed. The method is based on comparisons between X-ray diffraction (XRD) patterns of K-saturated, ethylene glycol-solvated, oriented samples and calculated XRD patterns for three-component, mixed-layer systems. For the calculated patterns it is assumed that the measured patterns can be modeled as random interstratifications of fully expanding 17.1 Å layers, partially expanding 13.5 Å layers and non-expanding 9.98 Å layers. The technique was tested using 29 well characterized smectites. According to their XRD patterns, smectites were classified as group 1 (low-charge smectites) and group 2 (high-charge smectites). The boundary between the two groups is at a layer charge of −0.46 equivalents per half unit-cell. Low-charge smectites are dominated by 17.1 Å layers, whereas high-charge smectites contain only 20% fully expandable layers on average. Smectite properties and industrial applications may be dictated by the proportion of 17.1 Å layers present. Non-expanding layers may control the behavior of smectites during weathering, facilitating the formation of illite layers after subsequent cycles of wetting and drying. The precision of the method is better than 3.5% at a layer charge of −0.50; therefore the method should be useful for basic research and for industrial purposes.

Keywords

Charge DistributionExpandable LayersK-saturationLayer ChargeLayerCharge ProgramProfile ModelingSmectiteX-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 6 , December 2003 , pp. 644 - 655
Copyright
Copyright © 2003, The Clay Minerals Society

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