Influence of Ce-Mn Substitution on Dielectric and Magnetic properties of Strontium based X-type hexaferrites

Abstract In the present work, Ce-Mn substituted X-type hexaferrites along chemical formula Sr2Zn2-xMnxFe28-yCeyO46 (x=0.0, 0.25, 0.50, 0.75, 1.0 and y=0.0, 0.025, 0.050, 0.075, 0.10) were produced by sol gel method. The micro graphical, structural, magnetic and dielectric possessions of specimens were characterized through X-ray diffractometer, scanning electron microscope, Fourier transform infrared spectroscopy, vibrating sample magnetometer and dielectric measurement setup respectively. X-ray diffractometer images demonstrated that fabricated composites possess a pure phase of X-type hexaferrites and has basic crystalline configuration of Sr-hexaferrite. The variance in the lattice parameters ‘a’ and ‘c’ was due to the Ce+3 large radius in comparison with Fe3+ ions. The Fourier transform infrared spectroscopy was within the 300-1000 cm-1 wave number range and indicated the stretching vibrational band of metal-oxygen (Fe-O). Vibrating sample magnetometer results revealed the hard magnetic behavior of specimens with the coercivity value of few thousand Oersteds. The dielectric constant demonstrated higher value at small frequencies and reduced as frequency increases. The tangent dielectric loss illustrated the normal behavior that could be described on octahedral locations based on jumping between the Fe2+ and Fe3+ electrons. The largest value of tangent loss at small frequencies is because of significance of composites prepared in medium frequency (MF) systems.