Rational A‐Site Entropy Engineering in Perovskites: Dual‐Exchange Enhanced Magnetoelectric Coupling for Ultra‐Efficient Microwave Absorption
High-entropy engineering at the A-site, combined with the variable valence states of Mn ions and diverse bonding configurations of perovskite elements and structures, presents new opportunities for the development and application of high-temperature electromagnetic wave-absorbing materials. In this study, the magnetic and dielectric properties of AMnO<sub>3</sub> are controlled by designing A-site elements with various ionic radii and entropies. The microwave-absorption performance of (La<sub>0.2</sub>Ba<sub>0.2</sub>Sr<sub>0.2</sub>Ca<sub>0.2</sub>Na<sub>0.2</sub>)MnO<sub>3</sub> high-entropy perovskites is significantly higher than those of AMnO<sub>3</sub> with different ionic radii and (Ba<sub>1/3</sub>Sr<sub>1/3</sub>Ca<sub>1/3</sub>)MnO<sub>3</sub> medium-entropy perovskites. Specifically, the high-entropy samples exhibit a minimum reflection loss (RL<sub>min</sub>) of -60.86 dB at a thickness of 1.0 mm and an effective absorption bandwidth of 3.26 GHz, whereas the medium-entropy ceramics show RL<sub>min</sub> values of -17.93 and -44.59 dB at 8.5 mm ((Ba<sub>1/3</sub>Sr<sub>1/3</sub>Ca<sub>1/3</sub>)MnO<sub>3</sub>) and 8.8 mm ((La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.25</sub>Ca<sub>0.25</sub>)MnO<sub>3</sub>), respectively. In high-entropy perovskites, aliovalent ions and oxygen vacancies at the A-site promote exchange interactions between Mn─O─Mn bonds, enhancing magnetism. Additionally, oxygen vacancies and lattice distortions in high-entropy systems enhance the dielectric loss, achieving magnetoelectric cooperative coupling in high-entropy perovskites. This work provides a new research direction for designing single-phase perovskites with excellent electromagnetic wave-absorbing properties via magnetoelectric cooperative-loss coupling.
Authors
- Yang Li (ORCID: https://orcid.org/0000-0001-6671-2666)
- Mengru Li (ORCID: https://orcid.org/0009-0009-8237-8130)
- Bingbing Fan (ORCID: https://orcid.org/0000-0002-1168-1142)
- Kaiyue Zhao (ORCID: https://orcid.org/0000-0003-4750-4698)
- Hongsong Zhang (ORCID: https://orcid.org/0000-0003-4251-7609)
- Qilong Gao (ORCID: https://orcid.org/0000-0002-8871-8329)
- Yanqiu Zhu (ORCID: https://orcid.org/0000-0003-3659-5643)
- Wei Li (ORCID: https://orcid.org/0000-0002-0592-606X)
- Hailong Wang (ORCID: https://orcid.org/0000-0002-6016-0335)
- Rui Zhang (ORCID: https://orcid.org/0000-0003-0162-7262)
- Dalong Tan
Institutions
- University of Exeter (GB)
- Zhengzhou University (CN)
- Henan Academy of Sciences (CN)
- Henan University of Engineering (CN)
- Luoyang Institute of Science and Technology (CN)
Publication Details
- Journal
- Advanced Science
- Published
- 2025-10-17
- DOI
- https://doi.org/10.1002/advs.202516938
- Primary Topic
- Multiferroics and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Henan Province