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Mössbauer and X-ray data on β-FeOOH (akaganéite)

Published online by Cambridge University Press:  09 July 2018

E. Murad*
Affiliation:
Institut für Bodenkunde der T. U. München, D-8050 Freising-Weihenstephan, West Germany

Abstract

β-FeOOH (akaganéite) was prepared by slow hydrolysis of an FeCl3 solution. X-ray diffraction measurements gave refined unit-cell parameters of a=10·535 Å, c=3·030 Å.

Two doublets with δ(Fe)=0·39, ΔEQ=0·95, and δ=0·38, ΔEQ=0·55 mm s−1, respectively, can be fitted to the Mössbauer spectrum taken at room temperature.

Magnetically split Mössbauer spectra were registered at 135 and 4°K. These can be resolved into at least three superimposed sextets, corresponding to different Fe3+ sites in the β-FeOOH structure. At 4°K a three sextet model gives parameters of δ=0·36, ΔEQ=0·90, Hi=473; δ=0·35, ΔEQ=0·30, Hi=479; and δ=0·37, ΔEQ=−0·05 mm s−1, Hi=486kOe, respectively.

The complexity of the Mössbauer spectra of β-FeOOH limits the usefulness of this method as a tool for the identification of akaganéite in composite natural samples.

Résumé

Résumé

β-FeOOH (akaganéite) a été préparé par hydrolyse lente d'une solution de FeCl3. Les mesures par diffraction X ont donné des valeurs améliorées des paramètres de maille, a=10·535 Å, c=3·030 Å.

On peut faire correspondre au spectre Mössbauer pris à température ambiante deux doublets avec respectivement δ(Fe)=0·39, ΔEQ=0·95 et δ=0·38, ΔEQ=0·55 mm s−1.

Des spectres Mössbauer dédoublés magnétiquement ont été observés à 135°K et à 4°K. Ceux-ci peuvent être résolus en au moins trois sextuplets superposés,correspondant à des sites Fe3+ différents dans la structure β=FeOOH. A 4°K un modèle à trois sextuplets donne des paramètres de δ=0·36, ΔEQ=0·90, Hi=473; δ=0·35, ΔEQ=0·30, Hi=479; et δ=0·37, ΔEQ=0·05 mm s−1, Hi=486 kOe, respectivement.

La complexité des spectres Mössbauer de β-FeOOH limite l'utilité de cette méthode comme outil pour l'identification de l'akaganéite dans des échantillons composites naturels.

Kurzreferat

Kurzreferat

β-FeOOH (Akaganéit) wurde durch langsame Hydrolyse einer FeCl3-Lösung hergestellt. Mittels Röntgenbeugung wurden verfeinerte Elementarzellenabmessungen von a=10·535, c=3·030 Å ermittelt.

Zwei Dubletts mit δ(Fe)=0·39, ΔEQ=0·95, bzw. δ=0·38, ΔEQ=0·55 mm s−1 konnten an das Zimmertemperatur-Mößbauerspektrum angepaßt werden.

Magnetisch aufgespaltene Mößbauerspektren wurden bei 135 und 4°K aufgezeichnet. An diese können mindestens drei sich gegenseitig überlagernde Sextetts angepaßt werden, die verschiedenen Fe3+-Lagen im β-FeOOH Gitter entsprechen. Bei 4°K ergab ein derartiges drei-Sextett Modell Modell Parameter von δ=0·36, ΔEQ=0·90, Hi=473; δ=0·35, ΔEQ=0·30, Hi=479; und δ=0·37, ΔEQ=−0·05 mm s−1, Hi=486kOe.

Die Tatsache, daß die Mößbauerspektren desβ-FeOOH derart kompliziert sind, beschränkt Anwendbarkeit der Methode zur Identifizierung des Akaganéits in natürlichen Vielstoffsystemen.

Resumen

Resumen

Se preparó β-FeOOH (acaganeita) por hidrólisis lenta de una solución de FeCl3. Las mediciones por difracción de rayos X dieron parámetros de malla refinada de a=10·535 Å, c=3·030Å.

Dos dobletes con δ(Fe)=0·39, ΔEQ=0·95, y δ=0·38, ΔEQ=0·55 mm s−1, respectivamente, pueden encajar en el espectro de Mössbauer tomado a la temperatura ambiente del cuarto.

Se registraron espectros de Mössbauer divididos magnéticamente a 135 y 4°K. Estos pueden resolverse en por lo menos tres sextetos superpuestos, que corresponden a distintos sitios de Fe3+ en la estructura β-FeOOH. A 4°K un modelo de tres sextetos arroja parámetros de δ=0·36, ΔEQ=0·90, Hi=473; δ=0·35, ΔEQ=0·30, Hi=479; y δ=0·37, ΔEQ=0·05 mm s, Hi=486 kOe, respectivamente.

La complejidad de los espectros de Mössbauer de β-FeOOH limita la utilidad de este método como medio de identificación de la acaganeita en muestras naturales mixtas.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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