Dielectric and magnetic properties of (1-x)CaTiO₃-xNi_0.5Zn_0.5Fe₂O₄ composite ceramics

Abstract

(1-x)CaTiO₃-xNi_0.5Zn_0.5Fe₂O₄ (0 ≤ x ≤ 1.0) composite ceramics were synthesized by a conventional solid state reaction method. The phase formation, microstructure, and dielectric and magnetic properties were investigated by X-ray diffraction, scanning electron microscopy, precision impedance analysis, and vibrating sample magnetometry, respectively. The results indicate that the composite ceramics are composed of both perovskite phase CaTiO₃ and spinel phase Ni_0.5Zn_0.5Fe₂O₄. The maximal relative density for 0.5CaTiO₃-0.5Ni_0.5Zn_0.5Fe₂O₄ composite ceramics reaches 97.8%, as it has been sintered at the temperature of 1260 °C for 3 h. Dielectric constant and loss tangent of (1-x)CaTiO₃-xNi_0.5Zn_0.5Fe₂O₄ composite ceramics show dispersion in the low frequency range. Their phase transition temperature of the dielectric constant shifts to lower temperatures with the increase of Ni_0.5Zn_0.5Fe₂O₄ content. This phenomenon is attributed to that the phase transition temperature of CaTiO₃ is higher than that of Ni_0.5Zn_0.5Fe₂O₄. The saturation magnetization of (1-x)CaTiO₃-x Ni_0.5Zn_0.5Fe₂O₄ composite ceramics increases with the Ni_0.5Zn_0.5Fe₂O₄ ferrite content.

Keywords

CaTiO₃ / Ni_0.5Zn_0.5Fe₂O₄ / dielectric constant / magnetic property

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