Microstructural and Magnetic Analysis Ni-Zn Ferrite Sinterized in the Conventional and Microwave Oven

Abstract

This paper assesses the sintering in a conventional oven and microwave oven of Ni-Zn ferrite. The samples were previously synthesized by combustion reaction in the microwave, and then sintered in a conventional oven and microwave oven 1200°C/2h with a heating rate of 5°C/min. The samples were characterized by: XRD, SEM and magnetic measurements by AGM. The results indicate the formation of inverse spinel crystalline phase of Ni-Zn ferrite, with inter-and intergranular porosity and average grain size of 0.15 µm and 0.30 µm, respectively for the samples sintered in a conventional oven and microwave oven. The sample sintered in conventional furnace showed a pattern characteristic of superparamagnetic materials with saturation magnetization of 7.6 emu.g-1, while in the microwave sintered sample showed a typical behavior of soft magnetic materials with saturation magnetization of 70 emu.g-1.