Synthesis conditions, structure and magnetic properties of Mn–Zn-ferrites prepared by spray pyrolysis of solutions of manganese, zinc and iron nitrates have been considered. The applied technique provides low-temperature (650 °C) obtaining highly dispersed (7-8 nm) powder of Mn_0.5Zn_0.5Fe₂O₄ ferrite with a narrow size distribution. Synthesis of Mn_0.5Zn_0.5Fe₂O₄ at low temperature avoids Mn^II → Mn^III oxidation reaction that influences negatively the ferrite properties. IR data collected from the ferrite samples obtained both in air and in N₂ ambient indicate their high structural and concentration homogeneity. Magnetic measurements confirm single-phase structure of the Mn_0.5Zn_0.5Fe₂O₄ powders and give no evidence of the presence of individual iron oxide phases. Curie temperature (375-380 K) is consistent with the theoretically calculated value for Mn_1-xZn_xFe₂O₄ (x = 0.5) (T_c = 365÷385 K). Parameters of Moessbauer spectra of the ferrites are typical of Fe^III state in oxide solid solutions with a considerable ionicity contribution in Fe–O bonds (δ = 0.33÷0.34 mm/s). Fe^II state was not revealed by Moessbauer spectroscopy that indicates the absence of Fe^III → Fe^II reduction accompanying the Mn^II → Mn^III oxidation process.

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