Microwave absorbing properties of Ba0.6Sr0.4Fe12-zMnzO19(z = 0-3) materials in XBand frequencies

Ba0.6sr0.4fe12-zmnzo19(z = 0,1,2,and 3) were successfully synthesized by solid state reaction through a mechanical milling method. stoichiometric quantities of analytical-grade mnco3,baco3,fe2o3,and srco3precursors with purity greater than 99% were mixed. it was found that the best phase composition,having an absorber with high performance,was ba0.6sr0.4fe11mno19. refinement of the x-ray diffraction patterns revealed that the ba0.6sr0.4fe11mno19was single-phase and had a hexagonal structure (p63/mmc). mechanical milling of ba0.6sr0.4fe11mno19powders 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 ba0.6sr0.4fe11mno19particles showed a low coercivity and a high remanent magnetization. the ba0.6sr0.4fe11mno19has 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 ba0.6sr0.4fe12-zmnzo19that was successfully synthesized is a good candidate for use as an electromagnetic absorber material. © 2016 published by itb journal publisher.