Dielectric and magnetic properties of Zn-substituted Co2Y barium hexaferrite prepared by sol–gel auto combustion method

This work describes the synthesis, structural, dielectric, and magnetic properties of Y-type Ba2Co2-xZnxFe12O22 hexaferrites prepared by the sol–gel n method. X-ray diffraction (XRD) results revealed a structure of the Zn-substituted samples consistent with the standard patterns for Y-type hexaferrites. The saturation magnetization at room temperature increased with Zn-substitution. Further, the coercive field for the sample with x=2.0 was found to have the lowest value.The results of the dielectric measurements indicated that all samples are insulators, and that the ac conductivity decreased with increasing zinc content. However, the ac conductivity increased with increasing dc bias. The effect of the dc bias was more pronounced on samples with low zinc content. The real part of the dielectric constant decreased markedly with increasing frequency at constant applied bias voltage. Further, the activation energy for the prepared samples depends strongly on the Zn concentration.