Characteristics of Barium Hexaferrite Nanoparticles Prepared by Temperature-Controlled Chemical Coprecipitation

Abstract

ABSTRACT. Ba-ferrite (BaFe12O19) nanoparticles were synthesized by chemical coprecipitation method in an aqueous solu-tion. The particle size and the crystallization temperature of the Ba-ferrite nanoparticles were controlled varying the pre-cipitation temperature. The precipitate that was prepared at 0 oC showed the crystal structure of Ba-ferrite in X-ray diffraction when it was calcined at the temperature above 580 oC, whereas what was prepared at 50 oC showed the crystallinity when it was calcined at the temperature higher than about 700 oC. The particle sizes of the synthesized Ba-ferrite were in a range of about 20-30 nm when it was prepared by being precipitated at 0 oC and calcined at 650 oC. When the precipitation tem-perature increased, the particle size also increased even at the same calcination temperature. The magnetic properties of the Ba-ferrite nanoparticles were also controlled by the synthetic condition of precipitation and calcination temperature. The coer-cive force could be appreciably lowered without a loss of saturation magnetization when the Ba-ferrite nanoparticles were prepared by precipitation and calcination both at low temperatures