HYDROTHERMAL SYNTHESIS OF BARIUM FERRITE FINE PARTICLES FROM GOETHITE

Barium ferrite fine particles were prepared from aqueous suspensions containing goethite (alpha-FeOOH) and barium hydroxide by a hydrothermal method. Barium ferrite particles of thin hexagonal plate shape could be produced from commercially available goethite with an Fe:Ba molar ratio of 7.2, whereas barium ferrite particles could be produced from synthesized goethite with a molar ratio of unity. The effects on the size of hexagonal platelike particles of such reaction conditions as temperature, stirring speed and alkali concentration were investigated. Particles of 0.6 to 0.8 mum mean size were prepared under the reaction conditions covered here.