Original Paper

Study of phase transitions in Ti and Sn doped Ba W-type hexaferrites by means of magnetic disaccommodation techniques

  1. Pablo Hernández-Gómez1,*,
  2. César Clavero1,
  3. Beatriz Martín1,
  4. Carlos Torres1,
  5. Carlos de Francisco1,
  6. José María Munoz1,
  7. Oscar Alejos1,
  8. Arnaldo González-Arias2

Article first published online: 27 JUL 2005

DOI: 10.1002/pssc.200461813

Issue

physica status solidi (c)

physica status solidi (c)

Volume 2, Issue 10, pages 3589–3592, August 2005

Additional Information

How to Cite

Hernández-Gómez, P., Clavero, C., Martín, B., Torres, C., de Francisco, C., Munoz, J. M., Alejos, O. and González-Arias, A. (2005), Study of phase transitions in Ti and Sn doped Ba W-type hexaferrites by means of magnetic disaccommodation techniques. physica status solidi (c), 2: 3589–3592. doi: 10.1002/pssc.200461813

Author Information

  1. 1

    Dpt. Electricidad y Electrónica, Univ. Valladolid, 47071 Valladolid, Spain

  2. 2

    Dpto. Física Aplicada, Universidad de La Habana, La Habana 10400, Cuba

*Phone: +34 983 423895, Fax: +34 983 423225

Publication History

  1. Issue published online: 27 JUL 2005
  2. Article first published online: 27 JUL 2005
  3. Manuscript Revised: 5 MAY 2005
  4. Manuscript Accepted: 5 MAY 2005
  5. Manuscript Received: 11 OCT 2004

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Keywords:

  • 64.70.Kb;
  • 75.50.Gg;
  • 75.60.Lr

Abstract

The relaxation of the initial permeability has been measured in polycrystalline Ba hexaferrites with the initial composition of W-type (BaMexFe18–xO27, with Me: Ti, Sn, in the substitution range 0 < x < 1). The samples, prepared by means of standard ceramic techniques, correspond to different phases, changing from W phase at lower doping rate to M phase with x = 1. In the temperature range between 80 and 420 K, the magnetic disaccommodation, i. e., the time decay of the initial permeability after sample demagnetization, is represented by means of isochronal curves. They show the presence of up to four relaxation processes whose maxima lie at 375 K, 300 K, 240 K and 180 K (resp. A, B, C and D peaks). With increasing doping content, the C, D and A processes vanish. The results are interpreted in terms of ionic reorientations of ferrous cations and lattice vacancies in the different metallic sites of the hexagonal close packed lattice, and the phase transitions with increasing doping content; in this way magnetic disaccommodation can be a valuable tool in the ellucidation of phase formation in the hexaferrite family. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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