Preparation and Magnetic Properties of Dense NiCuZn Ferrite by Spark Plasma Sintering
Dense NiCuZn ferrites consisting of fine grains were prepared by spark plasma sintering (SPS) at 750°C for 3 min under a uniaxial pressure of 15 MPa. The powders were densified to >95% of theoretical density by the SPS process, and the average grain size of the prepared NiCuZn ferrite was < 1 /m. The saturation magnetization of prepared specimens (without further annealing treatment) was approximate 50.54 emu/g, which was slightly smaller than that of 52.21 emu/g for specimens prepared by conventional sintering at 980°C for 4 h. Phase identifications indicated that prepared NiCuZn ferrite existed impurity phase (Cu2O), and Cu2O would gradually transform to CuO when annealing temperature increased.
Wei Pan and Jianghong Gong
X. W. Qi et al., "Preparation and Magnetic Properties of Dense NiCuZn Ferrite by Spark Plasma Sintering", Key Engineering Materials, Vols. 368-372, pp. 601-603, 2008