Hydrazine method of synthesis of γ-Fe2O3 useful in ferrites preparation. Part IV – preparation and characterization of magnesium ferrite, MgFe2O4 from γ-Fe2O3 obtained from hydrazinated iron oxyhydroxides and iron (II) carboxylato-hydrazinates

  • K. S. Rane
  • V. M. S. Verenkar
  • P. Y. Sawant
Article

DOI: 10.1023/A:1008964132630

Cite this article as:
Rane, K.S., Verenkar, V.M.S. & Sawant, P.Y. Journal of Materials Science: Materials in Electronics (1999) 10: 133. doi:10.1023/A:1008964132630

Abstract

Electro-magnetic properties and microstructural characterization of MgFe2O4 synthesized by a ceramic technique at ∼1000°C from iron oxides, consisting of mainly γ-Fe2O3 and traces of alpha-Fe2O3, prepared from iron ore rejects, are compared with the ferrite obtained from commercial alpha-Fe2O3. The sources of γ-Fe2O3 are hydrazinated iron (II) carboxylates and iron oxyhydroxides which autocatalytically decompose giving mainly γ-Fe2O3 of uniform particles of 10–30 nm (by scanning electron microscopy (SEM) studies) having high surface area. The ferrite synthesized from such nanoparticle size γ-Fe2O3 gave a porosity of ∼25% with grains ranging from 0–3 μm. On the other hand, MgFe2O4 obtained from commercial alpha-Fe2O3 grains (of 1–2 μm size) gave particles of 0–6 μm with a porosity ∼42%. Saturation magnetization values 922–1168 G are found for MgFe2O4 from γ-Fe2O3 source while the alpha-Fe2O3 source gave the lowest value, ∼609. The Curie temperature, Tc, from magnetic susceptibility, initial permeability and resistivity measurements indicated a highest Tc of ∼737 K for MgFe2O4 from alpha-Fe2O3, while lower values are found for the ferrite prepared from γ-Fe2O3.

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • K. S. Rane
    • 1
  • V. M. S. Verenkar
    • 1
  • P. Y. Sawant
    • 1
  1. 1.Department of ChemistryGoa UniversityGoaIndia

Personalised recommendations