NANOPHASE BAFE12O19 SYNTHESIZED FROM A NONAQUEOUS MICROEMULSION WITH BA-CONTAINING AND FE-CONTAINING SURFACTANTS

Ultrafine BaFe12O19 with uniform particle size was synthesized from an alcohol-in-oil (nonaqueous) microemulsion system where the metal ions were supplied by the surfactant (metal di-2-ethylhexylsulfosuccinate) molecules themselves. A monodisperse, fine-grained precipitate (Ba-Fe oxalate) was ensured by the steric barrier provided by the surfactant monolayer, while the nonaqueous environment promoted stoichiometric c oprecipitation. Pure BaFel2O19 was obtained by calcining the oxalate p recursor at or above 950 degrees C. Structural and magnetic properties of the resulting ultrafine magnetic material are reported.