Authors : S. A. Pawade1, V. M. Nanoti2, K. G. Rewatkar3
Page Nos : 1040-1052
Description :
A stoichiometricCr-substituted M-type Strontium Lanthanum Hexaferrites, SrLaFe12-x-yCrxO19, with x = 0 to 8, powder was synthesized by microwave assisted solgel auto-combustion route using urea as a reductant and nitrates as oxidants. The ferrites were systematically investigated by using powder X-ray diffractometer (XRD), magnetic hysteresis recorder, and Transmission Electron Microscope (TEM). (XRD) studies reveal that microwave-assisted combustion synthesis route yields materials with higher degree of compositional stability and phase purity. Both a and c lattice parameters calculated and found to decrease with increasing Cr content. The effects of Cr3+ ions on the Strontium Lanthanum ferrites were reported and discussed in detail. The site preference of Cr3+ and magnetic properties of the ferrites have been studied using hysteresis. The results show that the magnetic properties are closely related to the distributions of Cr3+ ions on the five crystallographic sites. The saturation magnetization slowly decreases, however, the coercivity decreases with Cr concentration. The magnetization results indicate that the Cr3+ ions preferentially occupy the 2a, 12k, and 4fVI sites. TEM study reveals nanosized ferrites.
