Caracterização dielétrica e magnética da eletrocerâmica Ba2Co2Fe12O22 dopada com Bi2O3 para aplicações em componentes eletrônicos

Abstract

The objective of this work is to study the dielectric and magnetic properties of electroceramics (Ba2Co2Fe12O22 - Co2Y) doped with (3; 5 and 10 wt%) of Bi2O3 in order to promote better dielectric and magnetic properties for applications in electronics. Phase Co2Y was obtained through the method of solid-state reaction. The structural characterization was performed by X-ray Diffraction using the Rietveld refinement. Magnetic hysteresis curves of the samples were obtained at room temperature. The Impedance Spectroscopy was used in the study of the dielectric function of frequency in the range 100-100 MHz, at room temperature. It follows that the Rietveld refinement confirmed the structure to the hexagonal crystalline phase obtained. The curve analysis confirmed the magnetic hysteresis behavior of the ferrimagnetic samples. Furthermore, the samples showed large values of dielectric permittivity (30.8) and small dielectric loss (3,66 x10-1) at 100 MHz for the sample B1, making them passive miniaturization.