Synthesis and Characterization of BaFe12O19 for EMI Shielding

Abstract

In present work, the cobalt (Co) doped Barium hexaferrite (Ba(1-x) Fe12 (Co)xO19) with different cobalt concentrations of x = 0, 0.2, 0.35 and 0.5 were prepared by using a chemical co-precipitation method. A calcination temperature of 950 °C was used for all the synthesized samples. The X-ray diffraction analysis of the prepared samples clearly showed the formation of Barium hexaferrite. The dielectric properties (including dielectric constant, dielectric loss, tangential loss, and AC conductivity) of the samples were studied via an impedance analyzer. With increasing Co concentration, a significant increase in the dielectric constant, dielectric loss and tangential loss was observed. Saturation magnetization and coercivity of the prepared samples were measured using vibrating sample magnetometer (VSM). The VSM analysis showed a decreasing trend in the saturation magnetization and coercivity values with increasing the Co concentration. The magnetic coercivity was found to be 3567 Oe and 918 Oe for Co concentration of x = 0 and 0.5, respectively, which also showed changing of hard magnetic ferrite to soft magnetic ferrite.