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Electron-Microscopic and Mössbauer Spectroscopic Studies of Iron-Stained Kaolinite Minerals

Published online by Cambridge University Press:  01 July 2024

D. A. Jefferson ,
M. J. Tricker  and
A. P. Winterbottom
D. A. Jefferson
Affiliation:
Edward Davies Chemical Laboratories, Aberystwyth SY23 1NE, U.K.
M. J. Tricker
Affiliation:
Edward Davies Chemical Laboratories, Aberystwyth SY23 1NE, U.K.
A. P. Winterbottom
Affiliation:
Edward Davies Chemical Laboratories, Aberystwyth SY23 1NE, U.K.
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Abstract

An electron-microscopic and Mössbauer spectroscopic study of a range of kaolinites has revealed three distinct types of iron contamination within these minerals: a) Ferric ion may substitute for aluminium and be evenly distributed throughout the lattice, b) Ferric ion may be present as a crystalline coating of goethite, as indicated by lattice-imaging studies, or c) as an amorphous coating. The distribution of the iron in the groups b and c is non-uniform and is highest at the flake surfaces. Ferrous ion, when detected, is thought to be evenly distributed throughout the lattice. The size of the contaminating goethite crystallites and the observed Mössbauer spectra of these samples suggest that such particles are super-paramagnetic. All kaolinites can be cleaned by acid treatment except those having iron substituting for Al3+.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 5 , October 1975 , pp. 355 - 360
Copyright
Copyright © 1975, The Clay Minerals Society

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References

Bancroft, G. M., (1973) Mössbauer Spectroscopy U.K. McGraw-Hill.Google Scholar
Bates, T. F. and Gard, J. A., (1971) The kaolin minerals The Electron-Optical Investigation of Clays London The Mineralogical Society 109–157.CrossRefGoogle Scholar
Brindley, G. W. and Brown, G., (1961) Kaolin, serpentine and kindred minerals X-ray Identification and Crystal Structures of Clay Minerals London The Mineralogical Society 51–131.Google Scholar
Brown, J. L. and Jackson, M. L., (1973) Chlorite examination by ultramicrotomy and high resolution electron microscopy Clays and Clay Minerals 21 1–7.CrossRefGoogle Scholar
Dowell, W. T. C., (1961) The observation of small crystal lattice spacings in the electron microscope J. Phys. Soc. Japan 17 175–178.Google Scholar
Erickson, H. P. and Klug, A., (1971) Measurement and compensation of de-focusing and aberrations by Fourier processing of electron micrographs Phil. Trans. R. Soc. London B261 105–118.Google Scholar
Forsyth, J. B. Hedley, J. G. and Johnson, C. E., (1968) The magnetic structure and hyperfme field of goethite J. Phys. C. Ser 1 179–188.Google Scholar
Gangas, N H S A K A Yossoglou, N. J. and Filippalis, S., (1972) Mössbauer studies of small particles of iron oxides in soils Clays and Clay Minerals 21 151–160.CrossRefGoogle Scholar
Kundig, W. Kobelt, M. Appel, H. Constabaris, G. and Lundquist, R. H., (1969) Mössbauer studies of Co3O4 bulk material and ultra-fine particles J. Phys. Chem. Solids 30 819–826.CrossRefGoogle Scholar
Mackay, A. L., (1962) Akaganéite Mineral. Mag. 33 270–280.Google Scholar
Mackenzie, R. C. Meldau, R. and Gard, J. A., (1962) Ageing of sesquioxide gels II Mineral. Mag. 33 145–157.Google Scholar
Mackenzie, R. C. Follet, E. A. C. Meldau, R. and Gard, J. A., (1971) The oxides of iron, aluminium and manganese The Electron-Optical Investigation of Clays London The Mineralogical Society 315–344.CrossRefGoogle Scholar
Rooksby, N. P. and Brown, G., (1961) Oxides and hydroxides of aluminium and iron X-ray Identification and Crystal Structures of Clay Minerals London The Mineralogical Society. 354–392.Google Scholar
Shinjo, T., (1966) Mössbauer effect in antiferromagnetic fine particles J. Phys. Soc. Japan 21 917–922.CrossRefGoogle Scholar
Suito, E. Arakawa, M. and Yoshida, T., (1969) Electron microscopic observation of the layer of organo-montmorillonite Proc. 3rd Int. Clay Conf. Tokyo 1 757–763.Google Scholar
Van der Woude, F. and Dekker, A. J., (1966) Mössbauer effect in alpha-FeOOH Phys. Stat. Solid. 13 181–193.CrossRefGoogle Scholar
Wickman, H. H. Klein, M. P. and Shirley, D. A., (1966) Paramagnetic hyperfine structure and relaxation effects in Mössbauer spectra: 57Fe in ferrochrome A Phys. Rev. 152 345–357.CrossRefGoogle Scholar