Formation of Hexagonal Ferrite Particles from the Disordered Fe2O3-BaO-B2-O3 System

摘要

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.