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Single-crystalline M-type Sr Hexaferrites studied by 57Fe Mössbauer spectroscopy

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Abstract

The 57Fe Mössbauer spectra of the single crystalline and the finely ground Sr1−x La x Fe12−y Co y O19 (x = 0 : y = 0, x = 0.192 : y = 0.152 and x = 0.456 : y = 0.225) samples have been measured to investigate the La-Co substitution effects. All observed spectra at 150 K were well fitted using the five subspectra which correspond to the five crystallographical nonequivalent Fe sites in the M-type hexaferrite, indicating that the valence changes to Fe2+ ions in the Fe3+ ions were not observed in our Sr1−x La x Fe12−y Co y O19 samples. In SrFe12O19, the relative absorption intensities in the five subspectra show the large anisotropies in the recoilless fractions at the five Fe sites whereas these anisotropies were not observed in Sr0.544La0.456Fe11.775Co0.225O19. These results indicate the chemical compositional dependence on the anisotropies of the recoilless fractions at the five Fe sites. The substitution of a Co2+ ion for the Fe3+ ion changes the center shifts of the Fe3+ ions near the Co2+ ion by the perturbation of the Fe-O-Co hybridizations. Therefore, the Co2+ ions occupy the 4f 1 and the 4f 2 sites due to the chemical compositional dependences of the refined magnetic hyperfine field and center shifts of the Fe3+ ions.

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Authors and Affiliations

  1. Graduate School of Material Science and Center for Novel Material Science under Multi-extreme Conditions, University of Hyogo, 3-2-1 Koto, Ako, Hyogo, 678-1297, Japan

    Nobumoto Nagasawa, Shugo Ikeda & Hisao Kobayashi

  2. Department of Material Science and Engineering, Kyoto University, Kyoto, 606-8501, Japan

    Aiko Shimoda, Takeshi Waki, Yoshikazu Tabata & Hiroyuki Nakamura

Authors
  1. Nobumoto Nagasawa
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  2. Shugo Ikeda
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  3. Aiko Shimoda
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  4. Takeshi Waki
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  5. Yoshikazu Tabata
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  6. Hiroyuki Nakamura
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  7. Hisao Kobayashi
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Correspondence to Nobumoto Nagasawa.

Additional information

This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2015), Hamburg, Germany, 13-18 September 2015

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Nagasawa, N., Ikeda, S., Shimoda, A. et al. Single-crystalline M-type Sr Hexaferrites studied by 57Fe Mössbauer spectroscopy. Hyperfine Interact 237, 39 (2016). https://doi.org/10.1007/s10751-016-1272-y

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  • DOI: https://doi.org/10.1007/s10751-016-1272-y

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