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Ferrites are the most widely used microwave absorbing materials to deal with the threat of electromagnetic (EM) pollution. However, the lack of sufficient dielectric loss capacity is the main challenge that limits their applications. To cope with this challenge, three high-entropy (HE) spinel-type ferrite ceramics including (Mg0.2Mn0.2Fe0.2Co0.2Ni0.2)Fe2O4, (Mg0.2Fe0.2Co0.2Ni0.2Cu0.2)Fe2O4, and (Mg0.2Fe0.2Co0.2Ni0.2Zn0.2)Fe2O4 were designed and successfully prepared through solid state synthesis. The results show that all three HE MFe2O4 samples exhibit synergetic dielectric loss and magnetic loss. The good magnetic loss ability is due to the presence of magnetic components; while the enhanced dielectric properties are attributed to nano-domain, hopping mechanism of resonance effect and HE effect. Among three HE spinels, (Mg0.2Mn0.2Fe0.2Co0.2Ni0.2)Fe2O4 shows the best EM wave absorption performance, e.g., its minimum reflection loss (RLmin) reaches −35.10 dB at 6.78 GHz with a thickness of 3.5 mm, and the optimized effective absorption bandwidth (EAB) is 7.48 GHz from 8.48 to 15.96 GHz at the thickness of 2.4 mm. Due to the easy preparation and strong EM dissipation ability, HE MFe2O4 are promising as a new type of EM absorption materials.


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High-entropy spinel ferrites MFe2O4 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn) with tunable electromagnetic properties and strong microwave absorption

Show Author's information Jiabin MAa,bBiao ZHAOa( )Huimin XIANGbFu-Zhi DAIbYi LIUcRui ZHANGdYanchun ZHOUb( )
Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
School of Material Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China

Abstract

Ferrites are the most widely used microwave absorbing materials to deal with the threat of electromagnetic (EM) pollution. However, the lack of sufficient dielectric loss capacity is the main challenge that limits their applications. To cope with this challenge, three high-entropy (HE) spinel-type ferrite ceramics including (Mg0.2Mn0.2Fe0.2Co0.2Ni0.2)Fe2O4, (Mg0.2Fe0.2Co0.2Ni0.2Cu0.2)Fe2O4, and (Mg0.2Fe0.2Co0.2Ni0.2Zn0.2)Fe2O4 were designed and successfully prepared through solid state synthesis. The results show that all three HE MFe2O4 samples exhibit synergetic dielectric loss and magnetic loss. The good magnetic loss ability is due to the presence of magnetic components; while the enhanced dielectric properties are attributed to nano-domain, hopping mechanism of resonance effect and HE effect. Among three HE spinels, (Mg0.2Mn0.2Fe0.2Co0.2Ni0.2)Fe2O4 shows the best EM wave absorption performance, e.g., its minimum reflection loss (RLmin) reaches −35.10 dB at 6.78 GHz with a thickness of 3.5 mm, and the optimized effective absorption bandwidth (EAB) is 7.48 GHz from 8.48 to 15.96 GHz at the thickness of 2.4 mm. Due to the easy preparation and strong EM dissipation ability, HE MFe2O4 are promising as a new type of EM absorption materials.

Keywords:

high-entropy ceramics (HECs), spinel-type ferrite, electromagnetic (EM) wave absorption, dielectric loss, magnetic loss
Received: 23 September 2021 Revised: 29 December 2021 Accepted: 08 January 2022 Published: 20 April 2022 Issue date: May 2022
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Publication history

Received: 23 September 2021
Revised: 29 December 2021
Accepted: 08 January 2022
Published: 20 April 2022
Issue date: May 2022

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© The Author(s) 2022.

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51802289 and 51972089). Financial supports of the Science Foundation for the Excellent Youth Scholars of Henan Province (Grant No. 212300410089) and the Support Program for Scientific and Technological Innovation Talents of Higher Education in Henan Province (Grant No. 21HASTIT004) are acknowledged.

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