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Influence of Zn-Zr Ions on Microstructural and Magnetic Properties of Ba Hexaferrites

Abstract

Magnetocrystalline structure and magnetic properties of BaFe12-2xZnxZrxO19 compounds with 0.0≤x≤0.6 were investigated by Mösbauer spectroscopy, thermomagnetic analysis, vibrating sample magnetometry, and TEM microscopy. The ferrite powders were prepared by ball milling (Mx) and by modified citrate precursor method (Sk), respectively. Relatively large change of the coercivity H c ; (from 376 kA/m down to 179 kA/m) with increase of x was obtained for (Sk) samples as a result of preferable 2b and 4f 2 sites occupation by Zn-Zr ions. The temperature coefficient of the coercivity dH c /dT approaches the value 0.14 kA/m°C at x=0.6 for (Mx) samples. Substituted Zn-Zr ions likely occupy also 4f 1 and 12 k sites for x≥0.4, which leads to a slight reduction in the specific magnetic polarization. Selected powder samples were treated by milling in an NaCl flux after calcination for achieving fine particles.

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Grusková, A., Papánová, M., Kevická, D. et al. Influence of Zn-Zr Ions on Microstructural and Magnetic Properties of Ba Hexaferrites. Czech J Phys 54, 671–674 (2004). https://doi.org/10.1007/s10582-004-0170-8

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Keywords

  • hexagonal ferrite
  • substituting effect