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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

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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

References

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