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.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.