Effect of Cr³⁺ Doped on Structural, Magnetic and Electrical Properties of Sol-Gel Synthesized SrFe₁₂O₁₉ Hexaferrite Nanoparticles

Abstract

Nanocrystalline SrFe12-xCrxO19 hexaferrite particles were successfully synthesized via Sol-gel route from Sr3+ and Fe3+ nitrates at molar ratio of 1:9 (Fe/Sr). The XRD results revealed single hexagonal magnetoplumbite SrFe10Cr2O19 phase formation in the presence of non-magnetic (α-Fe2O3) phases in the heated samples. The dielectric properties as a function of frequency under normal conditions were also measured in the frequency range of 500 Hz to 1 MHz. The variations of dielectric constant are discus on the basis of Maxwell–Wagner and Koops models. In VSM graph, coercivity and saturation magnetization confirms that the synthesized materials are suitable for applications in magnetic recording media.