Mechanochemical transformations in α-Fe2O3 - ICEMS study

S. J. Campbell*, G. Klingelhöfer, W. A. Kaczmarek, M. Hofmann, R. Nagel, G. Wang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Integral conversion electron Mössbauer spectroscopy has been used to investigate the phases and transformations which occur when α-Fe2O3 is wet-milled in vacuum for up to 144 h. In addition to the transformation to off-stoichiometric Fe3-xO4 observed previously by transmission Mössbauer spectroscopy, the room temperature ICEMS spectra reveal the presence of ∼10-15% γ-Fe2O3 on the surfaces of particles milled for more than 24 h. Time-of-flight neutron diffraction of an α-Fe2O3 sample wet-milled for 200 h also provides evidence of the occurrence of a small fraction (∼4%) of γ-Fe2O3 in the milled product. The γ-Fe2O3 is likely to occur as a surface oxide layer and does not appear to play a significant role in the mechanochemical transformation of α-Fe2O3 to Fe3-xO4.

    Original languageEnglish
    Pages (from-to)407-416
    Number of pages10
    JournalHyperfine Interactions
    Volume139-140
    Issue number1-4
    DOIs
    Publication statusPublished - 2002

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