Authors : Ekta Chaturvedi, A. P. Bhat, K. G. Rewatkar and V. M. Nanoti
Page Nos : 92-96
Description :
ABSTRACT:
M type SrFe12O19 hexagonal ferrite powder with partial substitution xIr+4 + x Ni+2 for 2x Fe+3 have been prepared by Sol-gel auto-combustion process using urea as a fuel and nitrates and bromides as oxidants. The precursor was annealed at the temperature of 800oC. The effect of composition on the crystallography, particle morphology and magnetic properties of SrO.(6-x)Fe2O3x(NiIr)O3, (x= 0.02 and 0.04) type hexagonal ferrite have been systematically investigated by an X-ray Diffractometer (XRD), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM). The obtained x-ray diffraction pattern of the samples showed magneto-plumbite phase for all the substituted compounds. Values of both ‘a’ and ‘c’ lattice parameters were found to increase with increasing concentration. TEM images of the sample demonstrate the formation of nanosize particles, which are found to decrease with substitution. Magnetic measurement showed that the coercivity (Hc), saturation magnetisation (Ms) and remenace (Mr) tends to decrease with respect to Ir-Ni content.
Key words : Hexagonal ferrites; Sol-gel auto-combustion; crystallography; nanoparticles; magnetic properties etc.
