Sintering Effect on Magnetite-to-Hematite Structural Conversion of As-Prepared Fe2+Cr0.2Fe1.8O4 Nano-Ferrites

This research presents effect of sintering temperature T and structural transition process on magnetic and optical properties of as-prepared magnetite Fe²⁺Cr_0.2Fe_1.8O₄ nanoferrites which synthesized by Co-precipitation method and sintered at different T. Structural phase of crystal lattice was converted from-cubic magnetite-to-maghemite-to-hexagonal hematite with T. Specific surface area S revealed decrease against crystallite size R. Saturation magnetization M_S proved dependence on R and porosity P. Strain behavior Ԑ enhanced band gap energy E_g.