| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-839 - C8-840 | |
| DOI | https://doi.org/10.1051/jphyscol:19888378 | |
J. Phys. Colloques 49 (1988) C8-839-C8-840
DOI: 10.1051/jphyscol:19888378
SYNTHESIS AND PROPERTIES OF ACICULAR BARIUM HEXAFERRITE
M. Najmi, P. Poix et J. C. BernierI.P.C.M.S. Unité mixte 380046 Groupe de Chimie des Matériaux Inorganiques, E.H.I.C.S., 1 rue Blaise Pascal 67008 Strasbourg Cedex, France
Abstract
The barium hexaferrite crystallizes in the hexagonal system of the magnetoplumbite type. The particles, generally prepared by solid state reactions, coprecipitation, crystallisation ion a glass or by growth under a flux, usually appear in the form of hexagonal platelets. We have prepared the barium hexaferrite in the acicular form, which may be of some considerable interest for high density recording. We present in this paper the results obtained from an original process, namely the impregnation of acicular "ferrous hydroxide" by a barium alcoholate. During the course of formation of BaFe12O19, the acicular morphology is conserved, while maintaining a high magnetization of about 60 emu/g and the coercive field of around 5200 oersteds.