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Diffraction effects calculated for structural models of K-saturated montmorillonite containing different types of defects

Published online by Cambridge University Press:  09 July 2018

V. A. D. Rits ,
A. Plançon ,
B. A. Sakharov ,
G. Besson ,
S. I. Tsipursky  and
C. Tchoubar
V. A. D. Rits
Affiliation:
Geological Institute of USSR Academy of Sciences, Pyzhewsky 7, Moscow 1999017, USSR
A. Plançon
Affiliation:
Laboratory of Crystallography (ERA no. 841), University of Orleans, 45046 Orleans Cedex, France
B. A. Sakharov
Affiliation:
Geological Institute of USSR Academy of Sciences, Pyzhewsky 7, Moscow 1999017, USSR
G. Besson
Affiliation:
Laboratory of Crystallography (ERA no. 841), University of Orleans, 45046 Orleans Cedex, France
S. I. Tsipursky
Affiliation:
Geological Institute of USSR Academy of Sciences, Pyzhewsky 7, Moscow 1999017, USSR
C. Tchoubar
Affiliation:
Laboratory of Crystallography (ERA no. 841), University of Orleans, 45046 Orleans Cedex, France
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Abstract

The general approach to the problem of the real structure of smectites requires an analysis based on the relationship between structural characteristics and diffraction patterns. This paper, which considers only the models corresponding to dioctahedral smectites saturated by K-cations and collapsed, includes: 1. Successive consideration of all models which are crystallochemically possible. These models may differ in (i) the structure and chemical composition of layers and interlayer spaces; (ii) the azimuthal orientations, translations and the mode of alternation of the layers; (iii) independent parameters which describe quantitatively the models (e.g. abundance of each type of layer, probability parameters defining the succession of layers, …). 2. Calculation, in all accessible domains of reciprocal space, of the distribution of intensities and profile variations, obtained by changing only one parameter at a time, that defines one type of structural feature (e.g. cation distribution in individual layers, stacking of the layers, nature of stacking faults, …). 3. A systematical analysis of the calculated diffraction patterns to establish the diffraction criteria which will help to interpret the experimental data explicitly.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 4 , September 1984 , pp. 541 - 561
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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