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Transformation studies of M- to W-type hexaferrite in BaFe12−2xCo3xO19

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Samples of general formula BaFe12−2xCo3xO19 (x=0.1, 0.3, 0.5) have been synthesized by ceramic as well as citrate gel routes. The X-ray diffraction patterns indicate that M-type phase forms for x=0.1, while W-type phase is favourable for x=0.3 and 0.5. The results for x=0.3 are particularly interesting. While the X-ray diffraction data show evidence of a monophasic W-type hexaferrite, the magnetic, thermal and microstructural investigations indicate a secondary phase presumably at grain boundaries. Transformation of M- to W-type hexaferrite has been explained in terms of different possibilities such as nucleation of secondary phases, formation of vacancies and different site occupation of ions in the structure.

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Authors and Affiliations

  1. Metullurgical Engineering and Materials Science Centre, Indian Institute of Technology, 400076, Powai, Bombay, India

    S. K. Mandal, K. Singh & D. Bahadur

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  1. S. K. Mandal
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  2. K. Singh
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  3. D. Bahadur
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Mandal, S.K., Singh, K. & Bahadur, D. Transformation studies of M- to W-type hexaferrite in BaFe12−2xCo3xO19 . JOURNAL OF MATERIALS SCIENCE 29, 3738–3742 (1994). https://doi.org/10.1007/BF00357342

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  • DOI: https://doi.org/10.1007/BF00357342

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