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Synthesis of barium hexaferrite for magnetic recording media using the KCl flux system

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Abstract

Individual and fine crystals of barium hexaferrite were prepared by a modified flux method using the KCI flux system. Co2+-Ti4+-substituted barium hexaferrite with a homogeneous composition was synthesized at 950° C for 5 h or at 1000° C for 1 h from a mixture of BaCO3, Fe2O3, CoO and TiO2 with 30 wt% KCI added. Laboratory-prepared fine Fe2O3, was preferred because it gave ferrite particles with diameters of 0.2 to 0.4μm. Magnetic properties were controlled by the Co-Ti content in hexaferrite crystals. Coercive force and Curie temperature decreased with the degree of Co-Ti substitution with saturation magnetization held at high value. The present process, from which individual and fine barium hexaferrite crystals can be prepared by using the KCI flux system, is recommended as a means of mass-production of ferrite powders with controlled magnetic properties for use in magnetic recording media.

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Authors and Affiliations

  1. Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, 464, Nagoya, Japan

    Kazuo Higuchi, Shinako Takahashi, Hideaki Itoh & Shigeharu Naka

Authors
  1. Kazuo Higuchi
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  2. Shinako Takahashi
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  3. Hideaki Itoh
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  4. Shigeharu Naka
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Higuchi, K., Takahashi, S., Itoh, H. et al. Synthesis of barium hexaferrite for magnetic recording media using the KCl flux system. J Mater Sci 23, 588–592 (1988). https://doi.org/10.1007/BF01174690

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  • DOI: https://doi.org/10.1007/BF01174690

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