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Surfactant assisted hydrothermal synthesis of Ba-ferrites

Irena Ban 1Darko Makovec 2Andrej Žnidaršič 3Darja Lisjak 2Miha Drofenik 1,2

1. FKKT, Smetanova 17, Maribor 2000, Slovenia
2. Josef Stefan Institute, Jamova 39, Ljubljana 1001, Slovenia
3. Kolektor Nanotesla Institute, Stegne 29, Ljubljana 1000, Slovenia


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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Presentation: Poster at E-MRS Fall Meeting 2007, Acta Materialia Gold Medal Workshop, by Irena Ban
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-06-14 12:11
Revised:   2009-06-07 00:44