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Stirring Effects on Properties of Al Goethite Formed From Ferrihydrite

Published online by Cambridge University Press:  28 February 2024

U. Schwertmann  and
H. Stanjek
U. Schwertmann
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising-Weihenstephan, Germany
H. Stanjek
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising-Weihenstephan, Germany
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Abstract

Minerals in surface environments form in both turbulent and non-turbulent systems. This study compares the properties of Al goethite formed from ferrihydrite at 60°C in 0.3 M KOH with and without mechanical stirring. Compared to the static system, stirring increased crystal order and needle thickness, decreased unit cell edge length a, but not b and c, reduced the separation between the 2 OH-bending vibrations, increased Al substitution and promoted hematite formation.

Keywords

Al GoethiteCrystallinityHematiteStirringUnit Cell Parameters
Type
Research Article
Information
Clays and Clay Minerals , Volume 46 , Issue 3 , June 1998 , pp. 317 - 321
Copyright
Copyright © 1998, The Clay Minerals Society

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