PREPARATION AND MAGNETIC-PROPERTIES OF BARIUM HEXAFERRITE NANOPARTICLES PRODUCED BY THE CITRATE PROCESS

The sol-gel synthesis technique has been used to produce barium ferrit e particles. Several methods such as X-ray diffractometry, transmissio n electron microscopy, and magnetism measurement (VSM) have been used to obtain detailed information on the crystallography and magnetic pro perties of the precursor and the calcined particles. The correlation o f BaFe12O19 formation with the precursor properties and thermal treatm ent has been studied. The optimum conditions for preparing BaFe12O19 n anoparticles at a low calcining temperature are reported, and homogene ous ultrafine BaFe12O19 with almost-ideal single-domain behavior and c oercive force (5950 Oe) and specific magnetization (70 emu/g) values t hat are similar to the theoretically predicted values is obtained.