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−x O4 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−x O4.
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Campbell, S.J., Klingelhöfer, G., Kaczmarek, W.A. et al. Mechanochemical Transformations in α-Fe2O3 – ICEMS Study. Hyperfine Interactions 139, 407–416 (2002). https://doi.org/10.1023/A:1021293921968
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DOI: https://doi.org/10.1023/A:1021293921968