ACTA

Magnetic Properties of Mechanochemically Synthesized Mixed Oxides

N.G. Kostova^a, A. Zorkovská^b, J. Kováč^b, N. Velinov^a, P. Baláž^b
^aInstitute of Catalysis, Bulgarian Academy of Sciences, acad. G. Bonchev, Bl. 11, 1 1113 Sofia, Bulgaria,
^bInstitute of Geotechnics Slovak Academy of Sciences, Watsonova 45, 043 53 Košice, Slovakia

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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 Mössbauer 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 Wüstite-type (FeZn)O mixed oxide, with ferromagnetic hysteresis and increased magnetization.

DOI: 10.12693/APhysPolA.126.411
PACS numbers: 77.84.Bw, 75.60.-d, 76.80.+y, 61.05.cp, 81.07.Wx