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

A. Sumoondur, S. Shaw, I. Ahmed, L. G. Benning

    Research output: Contribution to journalArticlepeer-review

    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 in situ and under O2-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. © 2008 The Mineralogical Society.
    Original languageEnglish
    Pages (from-to)201-204
    Number of pages3
    JournalMineralogical Magazine
    Volume72
    Issue number1
    DOIs
    Publication statusPublished - 2008

    Keywords

    • Diffraction
    • Green rust
    • Magnetite
    • Nanoparticulate
    • Synchrotron

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