Abstract
In this paper, preparation and characteristic evaluation of microwave absorber materials of BaFe 12-2x Mn x Ti x O 19 (x = 0.0 - 1.5) compositions are discussed. The absorber material was obtained by a co-substitution of Mn and Ti to Fe in a Barium Hexaferrite (BaO.6Fe 2 O 3 ) basic compound through a mechanical alloying process. In this respect, a co-substitution of Mn and Ti ions for Fe was applied to Fe 2 O 3 component at a temperature ~ 1,300 °C. The substituted alloy component was further alloyed mechanically with BaCO 3 to form M-Type hexaferrite after the solid state reaction. Identification of X-Ray diffraction peaks for the mechanically alloyed materials indicates confidently that a single phase BaFe 12-x-y Mn x Ti y O 19 material was formed. Materials characterization is covering the average grain sizes and absorption of microwaves in the frequency range 1-6 GHz. Absorption with a relatively high coefficient at frequencies ~ 2,000 MHz and ~ 3,500 MHz within the available frequency range was obtained. It is shown that the co-substitution of Mn and Ti ion able to widen the absorption frequency especially in the frequencies of about 3,500 MHz Keywords: Radar Absorber Materials (RAM), Type-M barium hexaferrites, Grain size, S-band frequency.
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