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Phase Analysis of Clays Using an Expert System and Calculation Programs for X-Ray Diffraction by Two- and Three-Component Mixed-Layer Minerals

Published online by Cambridge University Press:  28 February 2024

A. Plançon  and
V. A. Drits
A. Plançon
Affiliation:
Centre de Recherche sur la Matière Divisée, Université d'Orléans/CNRS, 45100 Orleans, France
V. A. Drits
Affiliation:
Geological Institute of the RAN, Pyzhevski Street 7, 109017 Moscow, Russia
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Abstract

X-ray phase analysis of clays is difficult because these materials generally consist of a mixture of different phases, i.e., mixed-layer minerals, individual clay minerals (non mixed-layer), and associated minerals, such as calcite and quartz. The analysis requires knowledge that presently is incorporated in a computer-based expert system. This expert system is capable of a) identification of associated minerals; b) identification of individual clay minerals; c) identification of the nature of the mixed-layer minerals; d) approximate structural characterization of the mixed-layer minerals; and e) precise structural determination of the mixed-layer minerals by comparison of experimental X-ray diffraction (XRD) patterns with calculated patterns for different models. Accuracy of the conclusions drawn by the expert system has been verified with literature data. Programs for the structural characterization of mixed-layer minerals must allow a) modification of the structural characteristics, abundances, and order-disorder distribution of the layers; b) modification of the distribution of the sizes of coherent scattering domains; and c) consideration of mixed-layer clays with more than two components. Two programs were written to calculate the XRD patterns of two- and three-component mixed-layer minerals consisting of any layer type and without any limitation in the order-disorder relationships.

Keywords

Clay AnalysisExpert SystemMixed-Layer MineralsPhase AnalysisXRD

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 57 - 62
Copyright
Copyright © 2000, The Clay Minerals Society

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References

Bailey, S.W., 1982 Nomenclature for regular interstratifications. American Mineralogist 67 394–398.Google Scholar
Drits, V.A. and Plançon, A., 1994 Expert system for structural characterization of phyllosilicates. II Application to mixed-layer minerals. Clay Minerals 29 39–45 10.1180/claymin.1994.029.1.05.CrossRefGoogle Scholar
Drits, V.A. and Sakharov, B.A., 1976 X-Ray Analysis of Mixed-Layer Minerals. Moscow Nauka.Google Scholar
Drits, V.A. and Tchoubar, C., 1990 X-Ray Diffraction by Disordered Lamellar Structures. Berlin Springer Verlag 10.1007/978-3-642-74802-8.CrossRefGoogle Scholar
Drits, V.A. Varaxina, T.V. Sakharov, B.A. and Plançon, A., 1994 A simple technique for identification of one-dimensional powder X-ray diffraction patterns for mixed-layer illite-smectites and other interstratified minerals. Clays and Clay Minerals 42 382–390 10.1346/CCMN.1994.0420402.CrossRefGoogle Scholar
Drits, V.A. Srodon, J. and Eberl, D.D., 1997 XRD measurement of mean crystallite thickness of illite/smectite: Reappraisal of the Kubier index and the Scherrer equation. Clays and Clay Minerals 45 461–475 10.1346/CCMN.1997.0450315.CrossRefGoogle Scholar
Drits, V.A. Sakharov, B.A. Lindgreen, H. and Salyn, A.L., 1997 Sequential structure transformation of illite-smec-tite-vermiculite during diagenesis of Upper Jurassic shales from the North Sea and Denmark. Clay Minerals 32 351–371 10.1180/claymin.1997.032.3.03.CrossRefGoogle Scholar
Ergun, S., 1970 X-Ray scattering by very defective lattices. Physics Review B 3371–3380.CrossRefGoogle Scholar
Garvie, L.A.J., 1993 INTERSTRAT—an expert system to help identify interstratified clay minerals from powder XRD data: I Description of the program. Clay Minerals 28 445–460 10.1180/claymin.1993.028.3.08.CrossRefGoogle Scholar
Garvie, L.A.J., 1994 INTERSTRAT—an expert system to help identify interstratified clay minerals from powder XRD data: II Testing the program. Clay Minerals 29 21–32 10.1180/claymin.1994.029.1.03.CrossRefGoogle Scholar
Jadgozinski, H., 1949 Eindimensionale Fehlordnung in Kristallen und ihr Einfluss auf die Röntgeninterferenzen. I Berechnung des Fehlordnunsgrades aus der Röntgenintensi-täten. Acta Crystallographica 2 201–207 10.1107/S0365110X49000552.CrossRefGoogle Scholar
Mering, J., 1950 Des Reflexions des Rayons X par les mi-neraux argileux interstratifies. Proceedings 4th International Congress on Soil Science, Amsterdam 1 21–26.Google Scholar
Moore, D.M. and Reynolds, R.C., 1997 X-Ray Diffraction and the Identification and Analysis of Clay Minerals Oxford Oxford University Press.Google Scholar
Plançon, A. and Drits, V.A., 1994 Expert system for structural characterization of phyllosilicates. I Description of the expert system. Clay Minerals 29 33–38 10.1180/claymin.1994.029.1.04.CrossRefGoogle Scholar
Plançon, A. and Zacharie, C., 1990 An expert system for the structural characterization of kaolinites. Clay Minerals 25 249–260 10.1180/claymin.1990.025.3.01.CrossRefGoogle Scholar
Reynolds, R.C. (1985) NEWMOD a computer program for the calculation of one-dimensional diffraction patterns of mixed-layer clays. R.C. Reynolds, 9 Brook Rd., Hanover, New Hampshire 03755, USA.Google Scholar
Watanabe, T., 1981 Identification of illite-montmorillonite interstratification by X-ray powder diffraction. Journal of the Mineralogical Society Japan 32–41.CrossRefGoogle Scholar