Enhancement of microwave absorption of nanocomposite BaFe12O19/α-Fe microfibers

摘要: Nanocomposite BaFe12O19/α-Fe microfibers with diameters of about 1–5 μm are prepared by the organic gel-thermal selective reduction process. The binary phase BaFe12O19 and α-Fe is formed after precursor BaFe12O19/α-Fe2O3 at 350 °C for 1 h. These nanocomposite fabricated from (16–22 nm in diameter) particles (36–42 basically exhibit a single-phase-like magnetization behavior, high saturation coercive force arising exchange-coupling interactions soft hard BaFe12O19. microwave absorption characteristics 2–18 GHz frequency range mainly influenced their mass ratio α-Fe/BaFe12O19 specimen thickness. It found that 1:6 thickness 2.5 mm show an optimal reflection loss (RL) −29.7 dB 13.5 bandwidth RL exceeding −10 covers whole Ku-band (12.4–18.0 GHz). This enhancement can be attributed to heterostructure soft, nano, conducting embedded hard, semiconducting barium ferrite, which improves dipolar polarization, interfacial interaction, anisotropic energy microfibers.