Preparation and Characterization of La-Doped and La-Dispersed Barium Hexaferrite

Abstract

In the present work Lanthanum substituted and Lanthanum dispersed barium hexaferrite (BaFe12O19) were prepared by solid state synthesis method. The structural, magnetic and microstructural characterization were carried out by X-ray diffractometer, VSM, mössbaure spectroscopy and scanning electron microscope respectively. XRD pattern shows the single phase BaFe12O19 for La-doped samples, whereas for La-dispersed samples, barium monoferrite (BaFe2O4) was found as a secondary phase with major phase BaFe12O19. Crystallite size was calculated by Debye sherrer formula. SEM shows that the average particle size of powder were same for La-doped and La-dispersed BaFe12O19. The magnetic properties show the variation in coercivity and saturation magnetization. Coercivity found to decrease in La-dispersed samples. However, no variation was observed in La-doped samples. Saturation magnetization found to decreased for La-doped barium hexaferrite, however in La-dispersed samples saturation magnetization first decreases and then increased to the value of pure BaFe12O19.