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Mössbauer Study of Microstructure and Magnetic Properties (Co, Ni)–Zr Substituted Ba Ferrite Particles

Abstract

The barium hexaferrites of M-type BaFe12−2x (Co, Ni) x Zr x O19 were synthesized by citrate precursor method in 0.0≤x≤0.6 range. For comparison, Ni–Zr compounds were also prepared by mechanical milling. Mössbauer measurements show that of Zr4+ ions have preference for 2b and 2a+4f 1 sites whereas Co2+ ions prefer 4f 2 and 12k positions. Different occupations were observed on Ni–Zr substitutions. The temperature coefficient of the coercivity, dH c /dT, was nearby to zero (0.01 kA/m°C) for the Co–Zr substitutes and positive for the rest of the samples. A fast reduction of coercivity H c with the increase in substitution level (370 to 150 kA/m) were underwent for all (Co, Ni)–Zr mixtures.

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Gruskova, A., Lipka, J., Papanova, M. et al. Mössbauer Study of Microstructure and Magnetic Properties (Co, Ni)–Zr Substituted Ba Ferrite Particles. Hyperfine Interactions 156, 187–194 (2004). https://doi.org/10.1023/B:HYPE.0000043223.50583.4a

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  • Mössbauer spectroscopy
  • hexagonal ferrite
  • magnetic properties
  • coercivity
  • substitution