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- Title
Synthesis and electromagnetic wave absorption properties of Gd-Co ferrite@carbon core–shell structure composites.
- Authors
Gao, Jing; Ma, Zhi-Jun; Liu, Fu-Li; Weng, Xing-Yuan
- Abstract
Developing high-performance electromagnetic absorbing materials remains a challenge. In this work, Gd-Co ferrite@carbon core–shell structure composites were synthesized by a two-step hydrothermal method. The effects of rare earth Gd doping amount on the microstructure and electromagnetic wave absorption properties of cobalt ferrite@carbon composites were mainly studied. The results show that an appropriate amount of Gd doping can refine the crystal grain size of cobalt ferrite@carbon composites. However, when the doping amount of Gd exceeds the solid solubility threshold, the secondary phase GdFeO3 will be generated and the grain size will increase. When the doping amount of Gd is x = 0.04, the reflection loss (RL) of the CoFe1.96Gd0.04O4@C composites reaches the minimum value of − 9.26 dB at the absorption layer thickness of 2.0 mm and a frequency of 13.67 GHz, and the effective absorption band (EAB) is 5.01 GHz (10.95–15.96 GHz). Compared with the CoFe2O4@C composites, the RL of the CoFe1.96Gd0.04O4@C composites is increased by 79.35%, and the EAB is broadened by 3.51%. Gd ions enhance the dielectric loss through the grain size effect, and the increase of magnetocrystalline anisotropy enhances the magnetic loss. The CoFe1.96Gd0.04O4@C composites have excellent impedance matching, which relies on the strong magnetic loss of ferrite, the interface polarization, and dipole polarization formed by the carbon shell to attenuate electromagnetic waves.
- Publication
Rare Metals, 2023, Vol 42, Issue 1, p254
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-022-02123-w