Abstract. Ba 0.6 Sr 0.4 Fe 12-z Mn z O 19 (z = 0,1,2, and 3) were successfully synthesized by solid state reaction through a mechanical milling method. Stoichiometric quantities of analytical-grade MnCO 3 , BaCO 3 , Fe 2 O 3 , and SrCO 3 precursors with purity greater than 99% were mixed. It was found that the best phase composition, having an absorber with high performance, was Ba 0.6 Sr 0.4 Fe 11 MnO 19 . Refinement of the X-ray diffraction patterns revealed that the Ba 0.6 Sr 0.4 Fe 11 MnO 19 was single-phase and had a hexagonal structure (P63/mmc). Mechanical milling of Ba 0.6 Sr 0.4 Fe 11 MnO 19 powders produced particles with a mean size of ~850 nm. SEM images revealed the morphology of the particles as being aggregates of fine grains. The magnetic properties of the Ba 0.6 Sr 0.4 Fe 11 MnO 19 particles showed a low coercivity and a high remanent magnetization. The Ba 0.6 Sr 0.4 Fe 11 MnO 19 has certain microwave absorber properties in the frequency range of 8-14 GHz, with an absorbing peak value of -8 dB and -10 dB at frequencies of 8.5 and 12.5 GHz, respectively. The study concludes that the Ba 0.6 Sr 0.4 Fe 12-zMnzO 19 that was successfully synthesized is a good candidate for use as an electromagnetic absorber material.

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