Ion combined substituting method for preparing high-performance MnZn ferrite

The invention provides an ion combined substituting method for preparing high-performance MnZn ferrite. The method improves the high-frequency magnetic property of MnZn ferrite mainly by adding In, Co, Ca, Ti and other elements. The addition amounts of the elements comprise In2O3 with a concentration of 1000-4000ppm, CoO with a concentration of 500-2000ppm, CaO with a concentration of 1000-3000ppm, TiO2 with a concentration of 1000-2500ppm, and SiO2 with a concentration of 0-2000ppm. The innovativeness of the invention is that through combined substituting of multiple ions with appropriate proportions and by utilizing influence of the ions on main components and interactions of the ions, the prepared MnZn ferrite has a saturation magnetic flux density higher than 530 mT at 25 DEG C and hither than 440 mT at 100 DEG C, and has an applicable temperature range of a temperature higher than 150 DEG C, and also the magnetic conductivity of the MnZn ferrite at a high frequency is improved, the power loss is reduced,