Magnetic and m�ssbauer study of rare-earth-substituted M-, W- and X-type hexagonal ferrites

• DOI: 10.1007/bf00584876
• Publication Date: 2004-11-23T02:37:58Z
• Authors: F. Leccabue; R. Panizzieri; S. Garcia; N. Suarez; J. L. Sanchez; O. Ares; Xue Rong Hua
• Keywords: Lanthanum; Lutetium; Thermomagnetic convection

The effects of substitution of Ba2+ ions for some trivalent rare-earth ions on the magnetic properties and phase formation of M-, W- and X-type hexaferrites are studied. The compounds considered were: Ba1-REx/2Nax/2Fe12O19 with RE = gadolinium, lanthanum, lutetium, samarium and 0.0 ⩽x ⩽ 0.3; Ba0.9La0.05Na0.05Zn2Fe16O27 and Ba1.9La0.05Na0.05Zn2Fe28O46. The samples were prepared by standard ceramic procedures and have been investigated by thermomagnetic analysis, X-ray diffraction, Mossbauer spectroscopy, scanning electron microscope and magnetic measurements. Monophasic BaREx/2-M compounds were found for 0.0⩽x<0.2 giving an indication of the solubility range of the rare-earth (RE) atoms in this phase. The intrinsic magnetic properties and the coercive field are lowered with the exception of the lanthanum-substituted hexaferrite. No significant differences in the phase formation and magnetic properties were observed for the W- and X-type hexaferrites.