Novel route of synthesis of Mn---Mg---ferrites using stabilised MnO

Stoichiometric polycrystalline samples of Mn_xMg_1?xFe₂O₄ (0·5 ≤ x ≤ 0·66) have been synthesized by following a novel route using stabilized MnO and Fe₂O₃ at high temperatures. This route precludes the formation of large amounts of Mn³⁺ and Fe²⁺ and precipitation of MgO and -Fe₂O₃ which are generally observed during the usual route of preparation by conventional ceramic techniques. These samples have been characterized for their structural and magnetic properties using X-ray diffraction, Fe⁵⁷ Mössbauer spectroscopy and bulk magnetic properties such as initial permeability, loss factor, ferromagnetic transition temperature, remanance and coercivity. For X = 0·62, these ferrites exhibit the highest remanance ratio 0·96, suitable for square loop applications.