Deformation Texture and Magnetic Properties of the Magnetoplumbite Ferrites

  • M. H. Hodge
  • W. R. Bitler
  • R. C. Bradt

Abstract

The barium and strontium hexaferrites, BaFe12O19 and SrFe12O19, are ferrimagnetic magnetoplumbites with a hexagonal crystal structure favoring the [0001] easy magnetic direction. Commercial utilization of these materials has lead to the development of sintered polycrystalline bodies in which a substantial degree of preferred orientation or texture of the individual crystallites has been accomplished by powder pressing in a magnetic field1. The uniaxial compaction involved, however, has a randomizing tendency, one that might be avoided if the crystallite alignment process were concurrent with or following the sintering stage. Several researchers have recently achieved a high degree of preferred orientation and correspondingly enhanced magnetic properties through hot forming2–4. This paper addresses the effects of hot working upon orientation in these ferrites.

Keywords

Migration Enthalpy Ferrite Hexa Hexagonal 

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References

  1. 1.
    A. L. Stuijts, Trans. Brit. Ceram. Soc., 55, 57–74, 1956.Google Scholar
  2. 2.
    R. M. Haag, AUSD-0248-71, CR, 1971.Google Scholar
  3. 3.
    N. Ichinose and Z. Tanno, J. Elect. Cer. Japan 3, (9), 57–61, 1972.Google Scholar
  4. 4.
    M. H. Hodge, W. R. Bitler, and R. C. Bradt, J. Amer. Cer. Soc. 56, (10) 497–501, 1973.CrossRefGoogle Scholar
  5. 5.
    D. R. Taft, RADC-TR-67-614, 1967.Google Scholar
  6. 6.
    E. Heyn and M. A. Grossman, Physical Metallurgy, John Wiley and Sons, Inc., New York, 1925.Google Scholar
  7. 7.
    M. H. Hodge, Ph.D. Thesis, Penn State Univ., 1973.Google Scholar
  8. 8.
    P. Ludwick, Elemente der Technologischen Mechanick, Berlin, Springer, 1909.Google Scholar
  9. 9.
    A. H. Cottrell, J. Mech. and Phys. Solids, (1), 53–63, 1952.Google Scholar
  10. 10.
    A. H. Cottrell and V. Aytekin, J. Inst. Metals, (77), 389–391, 1950.Google Scholar
  11. 11.
    M. E. Baker, Ph.D. Thesis, Cornell University, Thesis Univ. Microf. No. 68-16762.Google Scholar
  12. 12.
    S. P. Murorka and R. A. Swalin, J. Phys. Chem. Solids, 32, (6), 2015–2020, 1971.CrossRefGoogle Scholar
  13. 13.
    S. P. Murorka and R. A. Swalin, J. Phys. Chem. Solids, 32, (6), 1277–1285, 1971.CrossRefGoogle Scholar
  14. 14.
    M. F. De Souza, Phys. Rev., 188, (3), 1367–1370, 1969.CrossRefGoogle Scholar
  15. 15.
    D. C. Freeman and D. N. Stomires, J. Chem. Phys., 35, 799–801, 1961.CrossRefGoogle Scholar
  16. 16.
    H. M. O’Bryan and F. V. DiMarcello, J. Am. Ceram. Soc., 53, (7), 413–416, 1970.CrossRefGoogle Scholar
  17. 17.
    R. Krishnan, Phys. Stat. Solidi, 32, (2), 695–701, 1969.CrossRefGoogle Scholar
  18. 18.
    R. J. Bratton, J. Am. Ceram. Soc., 52, (8), 417–419, 1969.CrossRefGoogle Scholar
  19. 19.
    J. R. Keski and I. B. Cutler, J. Am. Ceram. Soc., 51, (3), 440–444, 1968.CrossRefGoogle Scholar
  20. 20.
    J. H. Christian and H. L. Taylor, J. Appl. Phys., 38, (10), 3843–3845, 1967.CrossRefGoogle Scholar
  21. 21.
    T. Sasamoto and T. Sata, Kogyo Kaguku Zasski, 74, (5), 832–839, 1971.Google Scholar
  22. 22.
    J. Kummer and M. E. Millberg, C. and EN., 90–99, 1969.Google Scholar
  23. 23.
    T. G. Langdon, Phil. Mag., 22, 689–700, 1970.CrossRefGoogle Scholar
  24. 24.
    J. P. Weertman, J. Appl. Phys., 26, 1213–1217, 1953.CrossRefGoogle Scholar
  25. 25.
    R. Raj and M. F. Ashby, Mat. Trans., 39 1937–1944, 1972.Google Scholar
  26. 26.
    H. G. van Bueren and J. Hornstra, 5th Int. Symp. React. Solids, Munich, 1964, ed., G. M. Schwab, Elsevier, Amsterdam, 1965.Google Scholar
  27. 27.
    J. Smit and H. P. J. Wijn, Ferrites, John Wiley and Sons, Inc., New York, 1959.Google Scholar
  28. 28.
    A. Holz, J. Appl. Phys., 41, (3), 1095–1096, 1970.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • M. H. Hodge
    • 1
  • W. R. Bitler
    • 2
  • R. C. Bradt
    • 2
  1. 1.TRW, Inc.PhiladelphiaUSA
  2. 2.The Pennsylvania State UniversityUniversity ParkUSA

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