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Journal of Materials Science

, Volume 29, Issue 14, pp 3738–3742 | Cite as

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

  • S. K. Mandal
  • K. Singh
  • D. Bahadur
Article

Abstract

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.

Keywords

Polymer Citrate Diffraction Pattern Diffraction Data Material Processing 
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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References

  1. 1.
    B. J. Shirk and W. R. Buessem, J. Am. Ceram. Soc. 54 (1970) 192.CrossRefGoogle Scholar
  2. 2.
    D. Bahadur and D. Chakravorty, in “Proceedings of ICF-5” C. M. Srivaslava and M. J. Patni, (Oxford and IBH, Delhi, 1989) p. 189.Google Scholar
  3. 3.
    J. P. Mingot, P. Wolfers and J. C. Joubert, J. Magn. Magn. Mater. 51 (1985) 337.CrossRefGoogle Scholar
  4. 4.
    S. Ram, D. Bahadur and D. Chakravorty, ibid. 67 (1987) 378.CrossRefGoogle Scholar
  5. 5.
    P. Bramha, A. K. Giri, M. Roy, D. Bahadur and D. Chakravorty, ibid. 103 (1992) 174.CrossRefGoogle Scholar
  6. 6.
    A. Srivastava, P. Singh and M. P. Gupta, J. Mater. Sci. 22 (1987) 1489.CrossRefGoogle Scholar
  7. 7.
    J. Smit and H. P. J. Wijn, “Ferrites” (Wiley, New York, 1959) p. 177.Google Scholar
  8. 8.
    F. Chou, X. Feng, J. Li and Y. Liu, J. Appl. Phys. 61 (1987) 3881.CrossRefGoogle Scholar
  9. 9.
    K. U. I. Jisheng, L. U. Huaixian and D. U. Youwei, J. Magn. Magn. Mater. 31–34 (1983) 801.CrossRefGoogle Scholar
  10. 10.
    J. P. Mingot, A. Collomb and J. C. Joubert, ibid. 58 (1986) 239.CrossRefGoogle Scholar
  11. 11.
    A. Collomb, O. Abdekadar, P. Wolfers, J. C. Joubert and D. Samaras, ibid. 58 (1986) 247.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • S. K. Mandal
    • 1
  • K. Singh
    • 1
  • D. Bahadur
    • 1
  1. 1.Metullurgical Engineering and Materials Science CentreIndian Institute of TechnologyPowai, BombayIndia

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