Abstract
The BaMn 2Fe 16O 27 and SrMn 2Fe 16O 27 W-type hexagonal ferrites were prepared; these two compounds are ferrimagnetic ( T c = 424°C, 430°C) with a room temperature magnetization σ ≈ 75 emu/g. The influence of the milling and annealing treatments on the powder samples is studied: in the (700–1200°C) annealing temperature range, the decomposition of the W-phase occurs, leading to the presence of the M-phase and α-Fe 2O 3. Green compacts with or without extraneous phases were prepared by pressing the milled powders under a magnetic field. We give the variations of the density, the remanence and the coercive force as a function of the sintering temperature; the best values are obtained with the presence of the extraneous phases: d ≈ 5 g/cm 3, B r ≈ 2500 G and H J c ≈ 3000 Oe.
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