Structural and magnetic properties of Sr2Co1.5Mg0.3Fe11.2Zr0.4Cd0.4O22hexaferrite synthesized by sol-gel auto-combustion method

The type hexagonal ferrite samples of a chemical formula Sr2Co1.5Mg0.3Fe11.8Zr0.4Cd0.4O22 weresynthesized via wet chemical sol–gel auto-combustion method. The X-ray diffraction (XRD)patterns confirm single phase Y-type hexagonal ferrite and various parameters such as latticeconstants and cell volume have been calculated from XRD data. The Fourier transform infrared(FTIR) spectra show the characteristics absorption ferrite peaks of the sintered sample. Themicrostructure was studied by field emission scanning electron microscopy (FESEM). All theferrites show a hexagonal platelet-like shape which is a most suitable shape for microwaveabsorption. The results revealed that single Co2Y hexaferrite phase was obtained at relatively lowtemperature 1050 °C for 3h compare with common solid state reaction. Magnetic properties of thesamples were also studied as a function of heat treatment temperature and it showed largesaturation magnetization (Ms) ranging from 32.65 to 42.00 emu/g and coercivity decrease from910 to 637 Oe depending on the heat treatment temperature. The very weak saturationmagnetization at relatively lower temperature (say 1000 °C) is due to the presence of someimpurities, such as SrO and Fe2O3. The saturation magnetization increases with increasing heattreatment temperature above 1050 °C, while the coercivity showed a reversed order.

Structural and magnetic properties of Sr2Co1.5Mg0.3Fe11.2Zr0.4Cd0.4O22hexaferrite synthesized by sol-gel auto-combustion method Keywords:

sol-gel auto-combustion , nano particle , phase formation , Y-type hexaferrite.