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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.