Study of the dielectric and magnetic properties of Co2Y, Y-type hexaferrite (Ba2Co2Fe12O22) added with PbO and Bi2O3 in the RF frequency range

In this paper the magnetic and dielectric properties of Y-type hexaferrite (Co2Y:Ba2Co2Fe12O22) added with 3, 5 and 10 wt.% of PbO and Bi2O3, obtained in a new procedure of the solid-state method, is presented. The analysis by X-ray diffraction (XRD) using the Rietveld refinement confirmed the formation of single-phase compound with a hexagonal crystal structure (a = b = 5.8560 Å and c = 43.4977 Å; α = β = 90° and γ = 120°). SEM micrograph of the material shows an uniform distribution of grains throughout the surface of the samples. Detailed studies of the dielectric properties of Co2Y, investigated in a wide frequency range (100 Hz to 100 MHz) at room temperature by complex impedance spectroscopy (CIS) technique, showed that these properties are strongly dependent on frequency and on the added level of the impurity. The effect of polyvinyl alcohol (PVA) and tetraethyl orthosilicate (TEOS) on the properties of Co2Y hexaferrite was also studied.