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Pseudo-superparamagnetic behaviour of barium hexaferrite particles.

Szymon Dudziak1, Zuzanna Ryżyńska2, Zuzanna Bielan1

  • 1Department of Process Engineering and Chemical Technology, Gdansk University of Technology G. Narutowicza 11/12 80-233 Gdansk Poland dudziakszy@gmail.com.

RSC Advances
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Hexadecyltrimethylammonium bromide (CTAB) addition modifies hexagonal barium ferrite particle properties. Surfactant-rich precipitation controls magnetic characteristics like coercivity without altering crystal structure.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Nanotechnology

Background:

  • Hexagonal barium ferrite (BaFe12O19) is a key magnetic material.
  • Controlling particle properties is crucial for applications.
  • Surfactant-assisted synthesis offers a route for property tuning.

Purpose of the Study:

  • Investigate the impact of hexadecyltrimethylammonium bromide (CTAB) on barium ferrite.
  • Optimize single-phase barium ferrite formation using varying Fe3+ concentrations and ratios.
  • Correlate synthesis conditions with crystal structure, morphology, and magnetic behavior.

Main Methods:

  • Co-precipitation synthesis of hexagonal barium ferrite.
  • Systematic variation of Fe3+ concentration and Fe3+/Ba2+ ratios.
  • Characterization of crystal structure, particle morphology, and magnetic properties.

Main Results:

  • CTAB addition influenced particle properties without altering the crystal structure.
  • Optimized conditions yielded single-phase barium ferrite particles.
  • Particles showed coercivity changes resembling superparamagnetic behavior despite larger sizes.
  • Surface barium incorporation and grain size reduction softened the material.

Conclusions:

  • Precipitation in CTAB-rich solutions enables tunable magnetic properties of BaFe12O19.
  • Coercivity can be reduced while maintaining high magnetization saturation.
  • This method offers control over magnetic properties without internal structural modification.