Authors : A.S.Kakde*, B.S.Satone#, K.G.Rewatkar*, P.S.Sawadh$, M.S.Choukwse@
Page Nos : 529-538
Description :
A series of M-type hexagonal ferrite with composition Ca(SnZr)xFe12–2xO19 (x = 0.8,1.0)
have been synthesized by sol–gel auto combustion technique. The precursor was
annealed at temperatures 800°C. The annealed powders were characterized using X-ray
diffractometer (XRD), vibrating sample magnetometer (VSM), DC electrical resistivity
and dielectric measurements. X-ray diffraction studies established the presence of a
single phase with the theoretical space group P63/mmc (194), and computed cell
parameters of „a‟ and „c‟. Sharp changes were observed in particle size (D) and lattice
constant („a‟ & „c‟) with the increasing Sn and Zr content. The VSM data revealed that,
the saturation magnetization values show a decreasing behavior with increasing
concentration of dopant due to the lower magnetic moment of Sn2+ (3 μB) as compared
to Fe3+ (5 μB) and coercivity increases due to enhancement of magnetocrystalline
anisotropy. The DC electrical resistivity (ρ) was measured as a function of temperature
from 303 K - 623 K. The DC electrical studies show that at room temperature these
ferrites exhibit high resistivity which goes on decreasing as the dopant concentration
increases. The effect of Sn+2 and Zr+4 substitutions on dielectric loss had been studied
for synthesized ferrite in the frequency range from 10 KHz to 1 MHz.
