Fabrication of Mn_0.4Zn_0.6Fe₂O₄/Microcrystal line graphite nanocomposites with tunable and efficient microwave absorption

Combining magnetic loss materials with carbon -based substances is widely considered an efficient approach to synthesizing high -performance microwave absorbing materials (MAMs). Herein, natural microcrystalline graphite, which has abundant reserves but confined application throughout the world, was employed as the carbon source to synthesize Mn0.4Zn0.6Fe2O4/microcrystalline graphite (MZF/MG) nanocomposites for microwave absorption by a novelty and promising high-temperature mechanochemical method (HTMC). The morphology, chemical compositions, static magnetic properties, electromagnetic wave absorption (EMWA) performances in 2-18 GHz, as well as the EMWA mechanisms of the composites, were comprehensively explored. The experimental results indicate that the addition of MG has a positive effect on the improvement of the EMWA performance of MZF. By varying the MG content and matching thickness of the MZF/(5-20)MG composite, their EMWA properties can be easily adjusted. Among them, the MZF/15MG composite achieves a minimum reflection loss (R-Lmin) of -42.1 dB (corresponding to 99.994 % of the EMWA) and an effective absorption bandwidth (EAB, R-L < -10 dB) of 3.94 GHz (12.54-16.48 GHz) with a matching thickness of 1.3 mm. This study is anticipated to provide an insightful proposition for HTMC and MG being applied to the field of fabricating effective MAMs.