Abstract:
The exceptionally unique magnetic and electric properties of ferrites have always been of strong interest leading to their extensive commercial use. Barium hexaferrite, is one of the materials being used in microwave, electronic and magnetic devices. In present research study, manganese, cobalt and nickel substitution is performed in a series of BaFe12-3x (MnNiCo)xO19 (x= 0, 0.2, 0.35, 0.5). Synthesis was performed using sol gel method and aqueous solutions of nitrates were used to prepare pure and doped barium hexaferrite nanoparticles. Calcination of the prepared samples was performed at 950 oC for 5 hours. The samples were characterized using X-ray Diffraction (XRD) and Fourier transform Infrared spectroscopy (FTIR). Impedance analyzer was used to analyze the dielectric properties. Magnetic properties of the samples were studied using Vibrating Sample Magnetometer (VSM). XRD analysis confirms the hexagonal crystal structure of prepared BaFe12-3x(MnNiCo)xO19. Crystallite size was calculated using Debye Scherer formula and it came out in the range of 36 nm-55 nm. Vibrating band positions were studied using FTIR. Dielectric studies revealed an increase in dielectric constant from 2.29×102 to 1.45×103 at 500 Hz with the increasing dopant concentration. Similarly, with increasing x value, the dielectric loss value was also increased. Magnetic properties of the prepared samples showed an increase in magnetic saturation from 56 emu/g at x = 0 to 60 emu/g at x = 0.5. A decrease in magnetic coercivity has been observed with increasing dopant concentration. The prepared samples showed an enhancement in dielectric and magnetic properties proving to be an efficient candidate for many magnetic and electrical applications.
