Abstract
Magnetic Properties of Mechanochemically Synthesized Mixed Oxides N.G. Kostova, A. Zorkovskab,∗, J. Kova£, N. Velinov, P. Balao Institute of Catalysis, Bulgarian Academy of Sciences, acad. G. Bonchev, Bl. 11, 1 1113 So a, Bulgaria Institute of Geotechnics Slovak Academy of Sciences, Watsonova 45, 043 53 Ko2ice, Slovakia The mixed oxides Fe2O3-ZnO have been obtained in nanocrystalline state by reactive milling in a high-energy planetary mill, from a stoichiometric mixture of hematite and ZnO. The magnetic properties of samples were evaluated by magnetization measurements and Mossbauer spectrometry. A post milling annealing promotes the solid state reaction and improves the zinc ferrite formation, paramagnetic ZnFe2O4 phase is formed. Further mechanical activation leads to structural transformation into Wustite-type (FeZn)O mixed oxide, with ferromagnetic hysteresis and increased magnetization.
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