Formation of BaFe _{12− <i>x</i>} Nb _<i>x</i> O ₁₉ and its high electromagnetic wave absorption properties in millimeter wave frequency range

Abstract

Abstract BaFe 12− x Nb x O 19 (BFNO, x =0‐0.6) powders with Nb 5+ substituting for Fe 3+ were prepared by sol‐gel method. The formation process and electromagnetic (EM) wave absorption properties of the BFNO are investigated in detail. With Nb 5+ content increasing from x =0 to x =0.6, the formation temperature of barium ferrite phase without heat time increases from ~700°C to ~900°C, while the appearance temperature of typical plate grains decreases from ~1300°C to ~1100°C, and the crystallization ability decreases at 600°C‐900°C, while the grain size increases gradually at 1100°C‐1300°C. Increasing sintering temperature and time promote the formation of barium ferrite phase and grain growth in all the samples. The ε′ and ε″ of the sample with x =0.6 sintered at 1300°C for 3 hours reach highest of ~7.9 and ~0.95 over 26.5‐40 GHz. Multiresonance peaks in permeability decrease from 40+ GHz to ~30 GHz with x rising from 0 to 0.6. Ultimately, small RL min of ~−42 dB, thin d m of ~0.76 mm, and broad bandwidth of &gt;12 GHz can be exhibited simultaneously around millimeter wave atmospheric window of 35 GHz.