Barium hexaferrite in a fine form is a major candidate for perpendicular magnetic recording medium and for the absorbers of the electromagnetic radiation. The demand for the synthesis of nanosized particles is large since they can be used in important technical applications. Nanoparticles of Ba-hexaferrite can be prepared using various methods, most commonly including high energy milling, co-precipitation, sol-gel method and hydrothermal syntheses. The hydrothermal synthesis of Ba-ferrite was performed in the presence of large organic molecules which stabilize the small crystallites during their formation and prevent the Ostwald ripening. The nanosized Ba-hexaferrite particles were prepared using surfactants assisted hydrothermal synthesis. The particle size and the phases formed after the hydrothermal syntheses were strong dependent on the selection of the proper surfactant and the conditions of the syntheses. A bi-modal particle size distribution of Ba-hexaferrite particles with an average size of 20-30 nm in a form of round crystallites and 100-200 nm sized platelets were obtained. The optimization of the particle size distribution will be performed by selecting the proper synthesis conditions.

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