Abstract
The Ni0.2Cu0.3Zn0.5Fe2O4 ferrite powders with calcining temperatures Ta of 500°C, 600°C, 650°C, 700°C and 800°C were prepared by sol-gel auto-combustion method. The 650°C-calcined sample has the highest saturation magnetic induction Bs and initial permeability μi. Then the 650°C-calcined powder was made into bulk samples and sintered by the two-step sintering method. The samples were first heated to a higher temperature,TH = 1000 ~1100°C, then immediately cooled to a lower temperature,TL = 950°C, for isothermal sintering with a dwelling time of 2 h. It was found that the two-step sintering method could significantly enhance the μi of the bulk Ni0.2Cu0.3Zn0.5Fe2O4 samples, and keep an excellent temperature stability μi of in the range of 70 ~ 230°C. The ΔT(TH - TL) has a great influence on μi, and the larger ΔT is required for improving magnetic softness of the bulk samples.
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