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  • English  (2)
  • 2005-2009  (2)
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  • English  (2)
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  • 1
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    Green rust as a precursor for magnetite: an in situ synchrotron based study (2008)
    In:  Mineralogical Magazine
    Details
    Publication Date: 2020-02-12
    Description: 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.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 2
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    Formation of hydroxysulphate and hydroxycarbonate green rusts in the presence of zinc using time-resolved in situ small and wide angle X-ray scattering (2008)
    In:  Mineralogical Magazine
    Details
    Publication Date: 2020-02-12
    Description: The formation and transformation of hydroxysulphate (GRSO(4)) and hydroxycarbonate (GRCO(3)) Green Rust, were studied ill situ using synchrotron-based time-resolved small and wide angle X-ray scattering. The time-resolved data revealed, for the first time, the pH dependent transition from poorly-ordered schwertmannite (pH 〈6.5) into GRSO(4) (pH similar to 6.8) followed by GRCO(3) (at PH similar to 9.6). These data also showed that the addition of Zn to the starting sulphate Fe2+/Fe3+ solution resulted in a change in size of the GR unit-cell due to substitution of Zn into the GR structure.
    Language: English
    Type: info:eu-repo/semantics/article
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