Transmission electron microscopy study of barium hexaferrite formation from barium carbonate and hematite View Full Text


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Article Info

DATE

1999-09

AUTHORS

Hanns P. Steier, Joaquin Requena, José S. Moya

ABSTRACT

The formation of barium hexaferrite from stoichiometric mixtures of BaCO 3 and Fe 2 O 3 has been investigated by means of differential thermal analysis and thermogravimetry, x-ray diffraction, and transmission electron microscopy–energy dispersive spectrometry. The first step, which implies decarbonatation and monoferrite formation, includes the formation of various intermediate compounds, which are formed at contact points between BaCO 3 and Fe 2 O 3 grains, and implies diffusion of both species. In the second step, barium hexaferrite is formed at interfaces between monoferrite and iron oxide mainly by diffusion of barium through the BF 6 lattice into the hematite lattice. This exothermic reaction process leads to nonagglomerated pseudohexagonal platelets with an average particle size very close to the one of the starting powder mixture (∼1 μm). More... »

PAGES

3647-3652

References to SciGraph publications

  • 1990-12. Preparation of barium hexagonal ferrites by sol-gel method in JOURNAL OF MATERIALS SCIENCE LETTERS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1557/jmr.1999.0492

    DOI

    http://dx.doi.org/10.1557/jmr.1999.0492

    DIMENSIONS

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