Green rust as a precursor for magnetite: an in situ synchrotron based study

Sumoondur, A.; Shaw, S.; Ahmed, I.; Benning, Liane G.

doi:10.1180/minmag.2008.072.1.201

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Green rust as a precursor for magnetite: an in situ synchrotron based study

Authors

Sumoondur, A.
External Organizations;

Shaw, S.
External Organizations;

Ahmed, I.
External Organizations;

/persons/resource/benning

Benning, Liane G.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Sumoondur, A., Shaw, S., Ahmed, I., Benning, L. G. (2008): Green rust as a precursor for magnetite: an in situ synchrotron based study. - Mineralogical Magazine, 72, 1, 201-204.
https://doi.org/10.1180/minmag.2008.072.1.201

Cite as: https://gfzpublic.gfz.de/pubman/item/item_806952

Abstract

In this study, direct evidence for the formation of magnetite via a green rust intermediate is reported. The Fe(II) induced transformation of ferrihydrite, was quantified ill situ and under O-2-free conditions using synchrotron-based time-resolved energy dispersive X-ray diffraction. At pH 9 and Fe(II)/Fe(III) ratios of 0.5 and 1, rapid growth (6 min) of sulphate green rust and its Subsequent transformation to magnetite was observed. Electron microscopy confirmed these results, showing the initial rapid formation of hexagonal sulphate green rust particles, followed by the corrosion of the green rust as magnetite growth occurred, indicating that the reaction proceeds via a dissolution-reprecipitation mechanism. At pH 7 and Fe(II)/Fe(III) ratio of 0.5, sulphate green rust was the stable phase, with no transformation to magnetite.