Preparation and Study of the Physical Properties of Advanced Composites Ferrites Doped with Ferroelectric Materials as Electromagnetic Wave Detectors

Magnetoelectric composites (1-x)Ni0.6Zn0.4Fe2O4+(x)(BaTiO3) (where x=0.0%,20%, 40%, 60% , 80%  and 100%BT content)  were prepared by using a conventional ceramic double-sintering method. Phase analysis was carried out using the x-ray diffraction technique, which confirms a cubic spinel structure for the ferrite and tetragonal perovskite structure for the ferroelectric phase. In order to confirm the formation of NZF phase into the BT phase; the IR spectra of the composite samples were recorded. The variation of the dielectric constant (e') and loss tangent (tan δ) as a function of temperature were studied. The conduction phenomenon is explained on the basis of a small polaron hopping model. The dc resistivity was measured as a function of temperature in the range from room temperature to 700 °C. The static magnetoelectric conversion factor (dE/dH)H was measured as a function of the magnetic field. All composites show a linear increase of magnetoelectric conversion in the presence of a static magnetic field.