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High-Entropy Spinel Ferrites with Broadband Wave Absorption Synthesized by Simple Solid-Phase Reaction
Xiu Chang1, Zhiwei Duan1, Dashuang Wang2
1The State Key Laboratory for Refractories and Metallurgy, Collaborative Innovation Center for Advanced Steels, International Research Institute for Steel Technology, Hubei Province Key Laboratory of Systems Science in Metallurgical Process, College of Science, Wuhan University of Science and Technology, Wuhan 430081, China.
High-entropy (HE) spinel ferrites synthesized via solid-phase reaction show excellent thermal stability and electromagnetic wave absorption properties. These materials demonstrate significant potential for advanced electromagnetic absorbing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Chemistry
Background:
- High-entropy materials offer unique properties due to their complex compositions.
- Spinel ferrites are known for their magnetic and dielectric characteristics.
- Effective electromagnetic wave absorbers are crucial for various technological applications.
Purpose of the Study:
- To synthesize and characterize high-entropy (HE) spinel ferrites.
- To evaluate their structural stability at high temperatures.
- To investigate their electromagnetic wave absorption performance.
Main Methods:
- Solid-phase reaction synthesis of (FeCoNiCrM)xOy (M = Zn, Cu, Mn) HE spinel ferrites.
- Characterization of chemical composition and 3D porous structures (tens to hundreds of nanometers).
- Assessment of structural thermostability up to 800 °C and electromagnetic absorption properties.
Main Results:
- Synthesized HE spinel ferrites (HEO-Zn, HEO-Cu, HEO-Mn) exhibit uniform composition and homogeneous 3D porous structures.
- All samples demonstrated ultrahigh structural thermostability up to 800 °C.
- HEO-Zn, HEO-Mn, and HEO-Cu showed excellent minimum reflection loss (RLmin) of -27.8 dB, -25.5 dB, and -27.3 dB, respectively, with broad effective absorption bandwidths (EAB) up to 7.5 GHz, covering the X-band.
Conclusions:
- High-entropy spinel ferrites possess superior thermal stability and electromagnetic wave absorption capabilities.
- The observed absorption properties are attributed to dielectric and magnetic energy losses, enhanced by the 3D porous structure.
- These HE spinel ferrites show significant potential for application as advanced electromagnetic absorbing materials.
