Influence of manganese oxide synthesis method on the structure and properties of MnZn ferrites

Abstract

This study investigates the influence of manganese oxide chemical synthesis methods on the phase composition, microstructure, and magnetic properties of MnZn ferrites. Chemical precipitation produced α‑Mn₂O₃ with a specific surface area of 1.1 m²/g, whereas sol-gel synthesis yielded α‑Mn₃O₄ with a specific surface area of 4 m²/g. Ferrites sintered at 1300 °C using the chemically precipitated α‑Mn₂O₃ exhibited an equiaxed grain structure with an average grain size of 6 ± 3 μm. In contrast, the use of sol-gel-derived α‑Mn₃O₄ resulted in the formation of abnormally large ferrite grains with an average size of 120 ± 70 μm. The ferrites sintered with the chemically precipitated manganese oxide demonstrated a 25% higher initial magnetic permeability, along with lower coercivity and magnetic loss levels.