Structural, magnetic and electrical study of rare earth doped Y- type hexaferrites

The sol–gel technique was used to synthesize a series of six samples with nominal composition Sr2Co2Fe12 − 2xMnxPrxO22 (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.1). The XRD analysis revealed a well-defined Y-type hexagonal single phase structure. The characteristics such as crystal size, porosity, bulk density, aspect ratio and X-ray density were also calculated by XRD patterns. The crystal size has a range from 59.6 to 25.5 nm. The lattice constant ‘a’ varies from 5.89 A to 5.96 A and lattice constant c varies from 43.35 A to 43.44 A. The surface morphology was performed by SEM analysis of investigated sample. The DC resistivity was calculated and found in the range of 2.86 × 107(Ω cm) to 7.47 × 107(Ω cm). Both dielectric constant, dielectric loss decreased with applied frequency. The variation of values of dielectric constant and dielectric loss was explained with the help of Maxwell Wagner and Koops phenomenological theory. The magnetic properties such as saturation magnetization, retentivity, coercivity of investigated samples was performed through VSM. Due to high resistivity and low dielectric constant these materials are considered best for high frequency microwaves devices.