RT Journal Article A1 Jiabin MA,Biao ZHAO,Huimin XIANG,Fu-Zhi DAI,Yi LIU,Rui ZHANG,Yanchun ZHOU; AD Science and Technology on Advanced Functional Composite Laboratory, 中国 ; 材料科学与工程学院航空材料与应用技术河南省重点实验室, 中国 ; 材料科学与工程学院航空材料与应用技术河南省重点实验室, 中国 ; Science and Technology on Advanced Functional Composite Laboratory, 中国 ; Science and Technology on Advanced Functional Composite Laboratory, 中国 ; 材料科学与工程学院, 中国 ; Science and Technology on Advanced Functional Composite Laboratory, 中国 T1 High-entropy spinel ferrites MFe2O4 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn) with tunable electromagnetic properties and strong microwave absorption YR 2022 IS 5 vo 11 OP 754-OP 768 K1 high-entropy ceramics (HECs);dielectric loss;magnetic loss;electromagnetic (EM) wave absorption;spinel-type ferrite AB 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. SN 2226-4108 LA EN