Authors : C.L. Khobaragade@, S.V. Soni#, A.K. Akant$, R. Khatarkar#, U. Rathod&, K. G. Rewatkarq
Page Nos : 619-629
Description :
M-type hexaferrites SrFe12-2x-y(CoZr)xO19 (x = 0.2, 0.6, 0.8, 1.0) powders are
synthesized by using sol-gel combustion method in nitrate citric acid systems. The Xray
diffraction pattern at room temperature shows that the prepared samples have a
single phase and the effect of composition on the unit cell parameters, density and
porosity has been studied. The X-ray diffraction patterns of SrFe12-2x-y(CoZr)xO19
annealed at 750 manifest that all the species have hexagonal crystal structure with
lattice constants of a = 5.80 - 5.86 Å and c = 22.08 - 22.21 Å. TEM observation of asburnt
powders of SrFe12-2x-y(CoZr)xO19 shows the powder particles have an average
particle size of 14-29 nm. The magnetic and electrical conductivity properties have been
investigated as a function of substitution of Co and Zr ions at applied field 15 kOe. The
magnetic properties have been characterized by taking into account microstructure and
preferential site occupancy of sublattice sites by substituted ions. Curie temperature
increases with substitution due to strong superexchange interaction. Electrical
conductivity shows decreasing trend by increasing substitution. The activation energy
in ferromagnetic is less than that of paramagnetic region. The change in magnetic and
electrical conductivity parameters results in possible use of substituted ferrite for
recording media, deflection yoke etc.
