Abstract
Ni–Zn ferrite powders with a nominal composition of Ni 0.5Zn 0.5Fe 2O 4 were prepared by combustion synthesis, using urea as fuel. The large quantity of gas that developed inhibited particle aggregation and yielded soft powders suitable for dispersion and use. The as-prepared combustion products, helium pycnometer and BET, which were characterized by XRD, showed a high specific surface area (44.26 m 2/g) and a very small particle and crystalline phase with atomic level homogeneity. The samples were uniaxially compacted by dry pressing and sintered at 1100°C, 1200°C, 1300°C and 1400°C for 2 h. The samples were characterized by bulk density, SEM, and B– H loop measurements. Optimum properties were obtained for samples sintered at 1200°C. The Ni–Zn ferrite presented a uniform microstructure with small grain size (2.0 μm), high density (95% TD) and significant hysteresis parameter values.
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