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Influences of mixing-grinding conditions on the properties of magnetite powders synthesized from the metallic-iron and hydrated iron [III] oxide powders in organic liquids containing hydrogen peroxide were investigated. The calcination products were characterized by X-ray diffractometry and 57Mossbauer spectroscopy. The yield of magnetite increased with the milling time and revolution frequency. The synthesis of magnetite powder was almost complete at 300rpm for 5 hours. After calcination at 773K in Ar, calcination product γ-(FeIII)A(FeII0.58III1.28)BO4, was highly non-stoichiometric compound. The degree of non-stoichiometry increased with the yield of magnetite. For the calcinations in Ar, the degree of non-stoichiometry decreased by the reaction with residual iron. The addition of H2O2 suppressed the reaction of Fe and FeO(OH) to form magnetite.

Characterization of Mechanochemically Synthesized Magnetite Powders from Fe and FeO(OH)