SYNTHESIS OF SUBSTITUTED M-TYPE AND W-TYPE BARIUM FERRITE NANOSTRUCTURED POWDERS BY STEARIC-ACID GEL METHOD

A series of substituted barium ferrites of M-type, Ba(CoTi)(x)Fe12-2xO 19, and W-type, BaZn2-yCoyFe16O27, were prepared as nanostructured pow ders using the stearic acid gel method. Well-crystallized nanocrystall ine hexaferrite particles of 10-20 nm have been obtained at temperatur es 650-750 degrees C lower than those of other methods. The structures and micrographs of the nanocrystalline materials were characterized b y X-ray diffraction and transmission electron microscopy. The phase co mposition of the intermediate products during the synthesis has been i nvestigated by differential thermal analysis, thermogravimetric analys is, IR spectroscopy and X-ray analysis.