首页|Heterointerface engineering in quaternary magnetic structures for high-efficiency and thermal stable microwave absorption
Heterointerface engineering in quaternary magnetic structures for high-efficiency and thermal stable microwave absorption
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NSTL
Elsevier
? 2022 Elsevier B.V.High-efficiency and thermal stability are two important factors of ideal microwave absorption materials (MAMs), which are becoming desired because of the more complex modern service environment. Herein, a novel quaternary magnetic core-shell-shell structure FeCo-Co@Fe3O4 @SiO2 (FCSF) has been fabricated by a facile and generic route. In this structure, the incipient oxidation temperature of magnetic core can be greatly increased from 523 K to 773 K by the Fe3O4/SiO2 double shells, and the multiple magnetic heterointerfaces can generate electron transfer and spin-orbit interaction based on DFT calculations. The minimum reflection loss (RLmin) and efficient absorption band (RL<?10 dB, feff) of FCSF composites can reach up to ?42.8 dB and 7.3 GHz with the thickness of 2 mm, due to the emerged electromagnetic loss mechanisms of interface polarization and exchange resonance. Moreover, owing to the optimized impedance matching and enhanced electromagnetic loss at elevated temperature, the RLmin values of FCSF at 673 K and 773 K increase by 15.4% and 41.2% compared with that at 298 K, respectively. The results demonstrate that the FCSF composite can act as a promising candidate for high-efficiency MAMs in thermal environment, and the synthetic strategy of heterostructures in this work can also be applied to design other MAM systems.
DFT calculationsHigh-efficiency microwave absorptionInterface effectsQuaternary magnetic heterostructuresThermal stability
Zhu Y.、Li J.、Li X.、Chen P.、Zhu B.
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The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology
NSTL
Elsevier
