J. Phys. IV France 07 (1997) C1-537-C1-538
Formation of Hexagonal Ferrite Particles from the Disordered Fe2O3-BaO-B2-O3 SystemM. Nejezchleba1, A. Klarikova1, J. Subrt2, V. Stengl2, K. Zaveta3 and M. Marysko3
1 Joint Laboratory of Mössbauer Spectroscopy, KFNT - MFF UK, V Holesovickach 2, 180 00 Praha 8, Czech Republic
2 Institute of Inorganic Chemistry, UACH AVCR, Pelléova 24, 160 00 Praha 6, Czech Republic
3 Institute of Physics, FzU AVCR, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic
It was shown that by high energy milling and subsequent annealing of the disordered powders from the BaO - Fe2O3 - B2O3 system crystalline particles of hexagonal barium ferrite are produced, whose formation commences slightly above 700 and is practically completed at about 800 °C. Both the X-ray diffraction and Mössbauer spectroscopy confirmed that the ensuing phase possesses the magnetoplumbite structure and its relative amount increases with the annealing temperature and/or time at the expense of the ferric oxide. These data are in reasonably good quantitative agreement with the results of the measurements of the magnetic moment of the particle systems.
© EDP Sciences 1997