Direct phase transformation from hematite to maghemite during high energy ball milling
2001; Elsevier BV; Volume: 47; Issue: 3 Linguagem: Inglês
10.1016/s0167-577x(00)00227-5
ISSN1873-4979
AutoresN. Randrianantoandro, A. M. Mercier, M. Hervieu, Jean‐Marc Grenèche,
Tópico(s)Minerals Flotation and Separation Techniques
ResumoHematite α-Fe2O3 powder was milled with a dispersing liquid (ethanol) for different times using a conventional planetary ball mill equipped with a steel vial. Both high resolution transmission electron microscopy (HRTEM), X-ray diffraction and zero- and in-field Mössbauer spectrometry measurements reveal that the nanostructured powders contain maghemite, suggesting that our milling conditions favour the direct transformation from α-Fe2O3 to γ-Fe2O3. Both the origin and the kinetics of the transformation are discussed in terms of mechanical aspects.
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