Microstructure and Temperature Dependence of Magnetic Properties of MnZnTiSn Ferrites for Power Applications

MnZnTiSn ferrties, prepared via the conventional ceramic process, by sintering at 1360??C in N₂-O₂ atmosphere with 4% oxygen, were characterized in terms of microstructures, magnetic properties and dc resistivity. Experimental results showed that TiSn-substitution remarkably improved magnetic properties and temperature stabilities of the MnZn ferrite ceramics. The effects of Ti⁴⁺ and Sn⁴⁺ substitution had certain synergistic effect. The sample, substituted with 0.2 mol% Ti⁴⁺and 0.1 mol% Sn⁴⁺, possessed maximum density and initial permeability, together with minimum core loss, residual magnetic flux density and coercive force.