7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-315-C1-316
DOI: 10.1051/jp4:19971124

Effects of Variations in Stoichiometry on M-Type Hexaferrites

C. Sürig¹, D. Bonnenberg¹, K.A. Hempel¹, P. Karduck², HJ. Klaar² and Ch. Sauer<sup>3

1</sup>  Institut für Werkstoffe der Elektrotechnik, Aachen University of Technology, Templergraben 55, 52056 Aachen, Germany
²  Gemeinschaftslabor für Elektronenmikroskopie, Aachen University of Technology, Templergraben 55, 52056 Aachen, Germany
³  Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, 52428 Jülich, Germany

Abstract
Barium hexaferrite particles prepared by sol-gel technique yield best magnetic characteristics if a large barium surplus is used. Therefore, the powder sample has to be etched after the annealing process in order to get samples without intermediate phases. The used temperatures below 900°C and times shorter than 1h cause nanocrystalline hexaferrite particles with a specific saturation magnetization above 700 Acm²/g and a coercivity up to 470 kA/m.

© EDP Sciences 1997

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