The Influence of the Preparation Conditions on Initial Permeability of Cu_0.5Zn_0.5Fe_2−x R _x O₄

Samples with the chemical formula Cu_0.5Zn_0.5Fe_2−x R _x O₄ (x = 0.0 and 0.02; R = Sm and Gd) were prepared using a conventional ceramic method. x-ray analysis revealed the formation of a single spinel phase. The porosity decreases with an increase in the pressing pressure and the pre-sintering time during the preparation. The initial permeability, Curie temperature, and the homogeneity of the samples are increased with the pressing pressure and the pre-sintering time. This improvement of initial permeability is a novel result for different applications at a normal frequency range. The electrical resistivity is increased by a decrease of the pressing pressure. This is another novel result for the technology especially at a high-frequency range. The results are explained according to the increase of the stoichiometry of the samples.