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Mössbauer Study of Transformations Induced in Clay by Firing

Published online by Cambridge University Press:  01 July 2024

A. Simopoulos ,
A. Kostikas ,
I. Sigalas ,
N. H. Gangas  and
A. Moukarika
A. Simopoulos
Affiliation:
Nuclear Research Center Democritos, Athens
A. Kostikas
Affiliation:
Nuclear Research Center Democritos, Athens
I. Sigalas*
Affiliation:
Nuclear Research Center Democritos, Athens
N. H. Gangas
Affiliation:
University of Ioannina, Greece
A. Moukarika
Affiliation:
University of Ioannina, Greece
*
*Also at National Defence Research Center, Athens, Greece
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Abstract

The clay fraction of an Attic soil has been fired at temperatures up to 1100°C and the transformations induced by firing were studied by Mössbauer spectroscopy. The unfired clay contained iron in the form of small particles of α-Fe2O3 and β-FeOOH and as a substitutional ion in the clay mineral structure. A transformation of β-FeOOH to α-Fe2O3 is observed in the region of 200–400°C followed by dehydroxylation of the clay mineral between 500 and 800°C. A disintegration of the clay mineral structure is inferred above 800°C, followed by recrystallization in an iron-rich phase, most probably in the form of very fine particles. The room temperature spectra of the fired samples indicate that an increase in particle size of the oxides occurs upon firing.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 5 , October 1975 , pp. 393 - 399
Copyright
Copyright © 1975, The Clay Minerals Society

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References

Dezsi, I. Keszthelyi, L. Kulgawczuk, D. Molnar, B. and Eissa, N. A., (1967) Mössbauer study of ß- and δ-FeOOH and their disintegration products Phys. stat. sol. 22 617–629.CrossRefGoogle Scholar
Gangas, N. H. Simopoulos, A. Kostikas, A. Yassoglou, N. J. and Filippakis, S., (1973) Mössbauer studies of small particles of iron oxides in soil Clays and Clay Minerals 21 151–160.CrossRefGoogle Scholar
Gangas, N. H. Kostikas, A. and Simopoulos, A., (1973) Mössbauer studies of oxide transformations in fired clay 5th Int. Conf. Mössbauer Spectroscopy .Google Scholar
Grim, R. E., (1968) Clay Mineralogy New York McGraw-Hill 287–288.Google Scholar
Janot, Ch and Delcroix, P., (1974) Mössbauer study of ancient French ceramics: Proc. Int. Conf. Applications Mössbauer Effect, Bendor J. Phys. Col 35 557–561.Google Scholar
Johnson, C. E., (1969) Antiferromagnetism of γ-FeOOH: a Mössbauer effect study J. Phys. 2 1996–2002.Google Scholar
Kostikas, A. Simopoulos, A. and Gangas, N. H., (1974) Mössbauer studies of ancient pottery J. Phys. Col. 35 107–115.Google Scholar
Kündig, W. Boemmel, H. Konstabaris, G. and Lindquist, R. H., (1966) Some properties of supported small α-Fe2O3 particles determined with the Mössbauer effect Phys. Rev. 142 327–333.CrossRefGoogle Scholar
Mackenzie, R. C., (1957) The Differential Thermal Investigation of Clays London Mineralogical Soc.Google Scholar
Mackenzie, K. J. D., (1969) A Mössbauer study of the role of iron impurities in the high temperature reactions of kaolinite minerals Clay Min. 8 151–160.CrossRefGoogle Scholar
Rooksby, H. P. (1961) The X-ray Identification and Crystal Structures of Clay Minerals. (Edited by Brown, G.) p. 370. Mineralogical Soc, London.Google Scholar
Van der Kraan, A. M., (1973) Mössbauer effect studies of surface ions of ultrafine α-Fe2O3 particles Phys. stat. sol. A 18 215–226.CrossRefGoogle Scholar
Voznyuk, P. O. and Dubinin, V. N., (1973) Magnetic structure of extremely small antiferromagnetic particles of β-FeOOH: SOV. Phys. Solid State 15 1265–1266.Google Scholar