• Dielectric behaviour of MgFe2O4 prepared from chemically beneficiated iron ore rejects

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    • Keywords


      Ore reject chemical beneficiation; gamma ferric oxide; ferrite; hydrazine; dielectric constant; dielectric loss factor.

    • Abstract


      Chemically beneficiated high silica/alumina iron ore rejects (27–76% Fe2O3) were used to synthesize iron oxides of purity 96–98% with SiO2/Al2O3 ratio reduced to 0.03. The major impurities on chemical beneficiations were Al, Si, and Mn in the range 2–3%. A 99.73% purity Fe2O3 was also prepared by solvent extraction method using methyl isobutyl ketone (MIBK) from the acid extracts of the ore rejects. The magnesium ferrite, MgFe2O4, prepared from these synthetic iron oxides showed high resistivity of ∼ 108 ohm cm. All ferrites showed saturation magnetization, 4𝜋𝑀s, in the narrow range of 900–1200 Gauss and the Curie temperature, 𝑇c, of all these fell within a small limit of 670 ± 30 K. All ferrites had low dielectric constants (𝜀'), 12–15, and low dielectric loss, tan 𝛿, which decreased with the increase in frequency indicating a normal dielectric dispersion found in ferrites. The presence of insignificant amount of polarizable Fe2+ ions can be attributed to their high resistances and low dielectric constants. Impurities inherent in the samples had no marked influence on the electrical properties of the ferrites prepared from the iron ore rejects, suggesting the possibility of formation of ferrite of constant composition, MgFe2O4, of low magnetic and dielectric losses at lower temperatures of 1000°C by ceramic technique.

    • Author Affiliations


      K S Rane1 V M S Verenkar1 P Y Sawant1

      1. Department of Chemistry, Goa University, Goa 403 206, India
    • Dates

  • Bulletin of Materials Science | News

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