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 language | English |
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Pages (from-to) | 407-416 |
Number of pages | 10 |
Journal | Hyperfine Interactions |
Volume | 139-140 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 2002 |