Preparation of phase homogeneous Mn-Zn ferrite powder by spray pyrolysis

Two kinds of aqueous precursor solutions are used to synthesize Mn-Zn ferri te powders: (i) nitrate (NO) precursor-derived from solutions of Mn(NO3)(2) , Zn(NO3)(2), and Fe(NO3)(3); and (ii) acetate (AC) precursor-derived from solutions of Mn(CH3COO)(2) Zn(CH3COO)(2), and Fe(NO3)(3). The composition o f the powders synthesized from the precursor AC is very uniform, whereas po wders derived from the precursor NO have Mn and Zn segregated on the partic le surfaces. In addition, the powders synthesized from precursor AC are sol id spherical particles with fine porosity, whereas many hollow and fragment ed particles are observed in the powder derived from precursor NO. Overall, the properties of Mn-Zn ferrite cores prepared from the precursor AC are s uperior to those prepared from the precursor NO. The reasons for the differ ences are explained and described in detail. The AC precursor powders synth esized by spray pyrolysis produced Mn-Zn ferrite cores with good magnetic p roperties.