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An expert system for the structural characterization of kaolinites

Published online by Cambridge University Press:  09 July 2018

A. Plançon  and
C. Zacharie
A. Plançon
Affiliation:
Laboratoire d'Etudes Physiques des Matériaux, Université d'Orleans, BP 6759, 45067 Orléans Cedex 2, France
C. Zacharie
Affiliation:
Laboratoire d'Etudes Physiques des Matériaux, Université d'Orleans, BP 6759, 45067 Orléans Cedex 2, France
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Abstract

Until recently, the determination of the defect structures (previously referred to incorrectly as “crystallinity”) of kaolinites has been obtained in one of two ways: (1) measurement of the Hinckley index, or (2) by comparing calculated X-ray diffraction patterns based on a model of the defect structure (including types of defects and abundances) with experimental diffraction profiles. The Hinckley method is simple and easy to perform but contains no real information about the defect structure. Calculated XRD patterns are based on real defects but these calculations are time consuming and require some skill in application. Another approach is proposed: an expert system which will accurately describe the defect structure of kaolinites based on a few measurements taken from a normal powder diffraction profile. This system has been verified for nine kaolinite samples for which the defect structure was previously determined by comparison of calculated and observed diffraction profiles. The expert system reproduced the correct defect structure for each of the samples.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 3 , September 1990 , pp. 249 - 260
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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References

Bookin, A.S., Drits, V.A., Plançon, A. Tchoubar, C.(1989) Stacking faults in kaolin minerals in the light of real structural features. Clays Clay Miner., 34, 297–307.Google Scholar
Brindley, G.W.(1961) Kaolin, serpentine, and kindred minerals. Pp. 51-131 in: The X-ray Identification and Crystal Structure of Clay Minerals (G. Brown, editor). Mineralogical Society, London.Google Scholar
Brindley, G.W., Kao, Chich-Chgun, Harrison, J.L., Lipsicas, M.L. Raythata, R. (1986) Relation between structural disorder and other characteristics of kaolinites and dickites. Clays Clay Miner., 34, 239–249.Google Scholar
Brindley, G.W. Robinson, K.(1946) Randomnessin the structure of kaolinitic clay minerals. Trans. Faraday Soc., 42B, 198–205.Google Scholar
Drits, V.A. Kashaev, A.A.(1960) An X-ray study of a kaolinite single crystal. Kristallogr., 5, 207–210.Google Scholar
Giese, R.F.(1982) Theoretical studies of kaolin minerals. Electrostatic calculations. Bull Mineral., 105, 417–424.Google Scholar
Goodyear, B. Duffin, M. A. (1961) An X-ray examination of an exceptionally well-crystallized kaolinite. Mineral. Mag., 32, 902–907.Google Scholar
Hockley, D.N.(1963) Variability in “crystallinity” values among the kaolin deposits of the coastal plain of Georgia and South Carolina. Clays Clay Miner., 11, 229–235.Google Scholar
Mitra, G.B. Battacherjee, S. (1969a) Layer disorders in kaolinite during dehydration. Acta Cryst. B25, 1668–1669.Google Scholar
Mitra, G.B. Battacherjee, S. (1969b) X-ray diffraction studies of the transformation of kaolinite into metakaolin: I-Variability of the interlayer spacings. Am. Miner., 54, 1409–1418.Google Scholar
Murray, H.H. Lyons, S.C., (1956) Correlation of paper coating quality with degree of crystal perfection of kaolinite. Clays Clay Miner., 4, 31–40.Google Scholar
Noble, F.R.(1971) A study of disorder in kaolinite. Clay Miner., 9, 71–80.Google Scholar
Plançon, A.(1981) Diffraction by layer structures containing different kinds of layers and stacking faults. J. Appl. Cryst., 14, 300–304.Google Scholar
Plançon, A. Tchoubar, C. (1977a) Determination of structural defects in phyllosilicates by X-ray diffraction. I- Principle of calculation of the diffraction phenomenon. Clays Clay Miner., 25, 430–435.Google Scholar
Plançon, A. Tchoubar, C. (1977b) Determination of structural defects in phyllosilicates by X-ray diffraction. II- Nature and proportion of defects in natural kaolinites. Clays Clay Miner., 25, 436–450.Google Scholar
Plançon, A., Giese, R.F. Snyder, R.(1988) The Hinckley index for kaolinites. Clay Miner., 23, 249–260.Google Scholar
Plançon, A., Giese, R.F., Snyder, R., Drits, V.A. Bookin, A.S.(1989) Stacking faults in the kaolin minerals. Clays Clay Miner., 37, 203–210. Google Scholar