A new method, via. the sonochemical decomposition of the solutions of organic precursors, for the synthesis of nanostructured crystalline single phase BaFe12O19 particles is proposed. Nanosized amorphous precursor powders for BaFe12O19, were prepared by the sonochemical decomposition of the solutions of Fe(CO)5 and Ba[OOCCH(C2H5)C4H9]2 in decane, under air at 273 K. The amorphous nature of these particles was confirmed by various techniques, such as SEM, TEM, SAED, and XRD, and the magnetic measurements indicated the superparamagnetic nature. The XRD of the heated sample of this confirmed the formation of single phase BaFe12O19, and the TEM micrograph revealed near uniform platelets with sizes less than 50 nm. The observed magnetization measured upto a field of 1.5 kG of the nanocrystalline BaFe12O19 sample (48 emu g-1) was significantly lower than that for the reported multidomain bulk particles (72 emu g-1), reflecting the ultrafine nature of the sample.
|Number of pages||6|
|State||Published - 1999|
|Event||Proceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed|
Duration: 14 Jun 1998 → 19 Jun 1998