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The Influence of Aluminum on Iron Oxides. Part XVI: Hydroxyl and Aluminum Substitution in Synthetic Hematites

Published online by Cambridge University Press:  28 February 2024

Helge Stanjek  and
Udo Schwertmann
Helge Stanjek
Affiliation:
Lehrstuhl für Bodenkunde der Technischen Universität München, D-8050 Freising-Weihenstephan, Germany
Udo Schwertmann
Affiliation:
Lehrstuhl für Bodenkunde der Technischen Universität München, D-8050 Freising-Weihenstephan, Germany
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Abstract

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Synthetic hematites with Al substitutions between 0 and 18 mol % were synthesized at different temperatures and water activities. The cell-edge lengths a for different synthesis conditions decreased linearly with increasing Al substitution. The regression lines, however, had different slopes and intercepts: the series with the highest synthesis temperature (1270 K) had the most negative slope. With increasing Al substitution, the hematites contained increasing amounts of non-surface water. Significant correlations were found between these chemically determined water contents and the deviations of the unit-cell parameters a, c, and V relative to the corresponding 1270 K regression lines. To explain the measured X-ray peak intensities, structural OH had to be included into the theoretical calculations. From intensity ratios normalized to I113, it is possible to determine the structural OH separately from the Al substitution, which can be assessed by the shift of the cell-edge lengths relative to the 1270 K regression lines. The incorporation of Al and OH into the hematite structure induces strain, which was quantified by X-ray diffraction.

Keywords

Al substitutionCell-edge lengthsHematiteLOIOH substitutionX-ray intensity
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 3 , June 1992 , pp. 347 - 354
Copyright
Copyright © 1992, The Clay Minerals Society

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