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Rational A-Site Entropy Engineering in Perovskites: Dual-Exchange Enhanced Magnetoelectric Coupling for
Mengru Li1, Kaiyue Zhao1,2, Bingbing Fan1,3,4
1School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 17, 2025
Summary
High-entropy perovskites demonstrate superior electromagnetic wave absorption. Tailoring A-site elements in (La0.2Ba0.2Sr0.2Ca0.2Na0.2)MnO3 enhances magnetic and dielectric properties for advanced wave-absorbing materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Electromagnetism
Background:
- High-temperature electromagnetic wave-absorbing materials are crucial for various applications.
- Perovskite structures (AMnO3) offer tunable properties for wave absorption.
- High-entropy engineering presents a novel approach to enhance material performance.
Purpose of the Study:
- To investigate the effect of A-site high-entropy engineering on the electromagnetic wave absorption properties of AMnO3 perovskites.
- To correlate magnetic and dielectric properties with structural modifications induced by A-site composition.
- To explore the potential of magnetoelectric cooperative coupling in high-entropy perovskites for enhanced microwave absorption.
Main Methods:
- Synthesis of high-entropy (La0.2Ba0.2Sr0.2Ca0.2Na0.2)MnO3 and medium-entropy (Ba1/3Sr1/3Ca1/3)MnO3 perovskites.
- Characterization of magnetic properties, including exchange interactions and magnetism enhancement.
- Evaluation of dielectric properties, focusing on dielectric loss and oxygen vacancies.
- Measurement of microwave absorption performance, including minimum reflection loss (RLmin) and effective absorption bandwidth.
Main Results:
- The high-entropy (La0.2Ba0.2Sr0.2Ca0.2Na0.2)MnO3 exhibited significantly enhanced microwave absorption compared to medium-entropy counterparts.
- A minimum reflection loss (RLmin) of -60.86 dB at 1.0 mm thickness and an effective absorption bandwidth of 3.26 GHz were achieved for high-entropy samples.
- Aliovalent ions and oxygen vacancies in high-entropy perovskites promoted Mn-O-Mn exchange interactions, enhancing magnetism.
- Oxygen vacancies and lattice distortions in high-entropy systems improved dielectric loss, leading to magnetoelectric cooperative coupling.
Conclusions:
- High-entropy engineering at the A-site of AMnO3 perovskites is an effective strategy for developing high-performance electromagnetic wave absorbers.
- Magnetoelectric cooperative coupling, driven by enhanced magnetism and dielectric loss, is key to the superior performance of these materials.
- This research opens new avenues for designing single-phase perovskite materials with excellent electromagnetic wave-absorbing capabilities.
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