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Journal of Materials Science

, Volume 30, Issue 6, pp 1429–1433 | Cite as

Magnetic properties of hydrothermally synthesized strontium hexaferrite as a function of synthesis conditions

  • A. Ataie
  • I. R. Harris
  • C. B. Ponton
Papers

Abstract

Fine particles of strontium hexaferrite, SrFe12O19, with a narrow size distribution have been synthesized hydrothermally from mixed aqueous solutions of iron and strontium nitrates under different synthesis conditions. The relationship between the synthesis variables (temperature, time and alkali molar ratio) and the magnetic properties has been investigated. The results have shown that, as the synthesis temperature increases, the saturation magnetization of the particles increases up to a plateau and the coercivity decreases. As the alkali molar ratio R(=OH/NO 3 ) increases, the coercivity decreases and goes through a local minimum, while the saturation magnetization increases and goes through a local maximum. Increasing the synthesis time from 2 h to 5 h has no significant effect on the saturation magnetization, but decreases the coercivity. An anisotropic sintered magnet with a high saturation magnetization value of 67.26 e.m.u g−1 (4320 G) has been fabricated from the hydrothermally synthesized powders.

Keywords

Nitrate Magnetic Property Strontium Local Minimum Fine Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • A. Ataie
    • 1
  • I. R. Harris
    • 1
  • C. B. Ponton
    • 1
  1. 1.School of Metallurgy and MaterialsThe University of BirminghamEdgbastonUK

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