Abstract
The solid state reaction between Al and Fe3O4 (magnetite) using mechanochemical activation of powder mixtures under Ar atmosphere is studied. The phase evolution during the reaction is analyzed by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), differential thermal analysis (DTA) and scanning electron microscopy (SEM). At 37 minutes of high-energy ball-milling the disappearance of reactive phases and the production of α-Fe, FeAl2O4 and α-Al2O3 is observed, together with significant changes in the magnetic behavior of the system. The composition and properties of samples heated up to 1200°C are also investigated. The behavior of the saturation magnetization M s is interpreted on the basis of the formation of a variable composition spinel phase Fe [Al x Fe2−x ] O4 with 0 ≤ x ≤ 2 and a canting effect due to the presence of Al3+ ions in the spinel structure.
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Botta, P.M., Bercoff, P.G., Aglietti, E.F. et al. Magnetic and structural study of mechanochemical reactions in the Al-Fe3O4 system. Journal of Materials Science 37, 2563–2568 (2002). https://doi.org/10.1023/A:1015412211898
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DOI: https://doi.org/10.1023/A:1015412211898