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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
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High-entropy perovskite oxides: Morphotropic phase boundary interfacial engineering for next-generation
Kai Yao1,2,3, Lixin Song2,3, Xiang Zhang1
1Shanghai Key Laboratory for Development and Application of Metal Functional Materials, School of Materials Science & Engineering, Tongji University, Shanghai 201804, P. R. China.
Science Advances
|December 5, 2025
Summary
High-entropy materials engineering precisely controls interfaces for advanced applications. This strategy enhances microwave absorption in perovskite oxides, crucial for next-generation communication technologies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Controlling atomic-level interfacial properties like charge density and lattice distortions is crucial for electromagnetism, optoelectronics, and catalysis.
- Anisotropic morphotropic phase boundary (MPB) interfaces present unique challenges and opportunities for material property manipulation.
Purpose of the Study:
- To introduce a high-entropy strategy for synergistic manipulation of charge density and lattice strain at MPB interfaces.
- To investigate the stabilization of multiphase polar nanoclusters and their effect on interfacial polarization in high-entropy perovskite oxides (HEPOs).
- To demonstrate the application of this MPB interfacial engineering in enhancing microwave absorption properties.
Main Methods:
- Utilized a high-entropy strategy to introduce local compositional disorder.
- Conducted experimental and computational studies to analyze structural and electronic properties.
- Investigated the formation and behavior of multiphase polar nanoclusters within HEPOs.
- Engineered MPB interfaces to optimize charge density redistribution and polarization.
Main Results:
- High-entropy effect was found to stabilize multiphase polar nanoclusters in HEPOs.
- This stabilization led to efficient charge density redistribution and enhanced MPB interfacial polarization.
- Perovskite oxides transformed from negligible to high-performance microwave absorbers in the low-frequency range.
- Achieved complete absorption coverage of the 5G n79 band with an absorption efficiency of 0.71 GHz/mm.
Conclusions:
- MPB interfacial engineering using high-entropy materials is a viable strategy for low-frequency microwave absorption.
- The developed HEPOs show significant potential for next-generation communication technologies.
- The strategy holds broad applicability for advancements in catalysis, photonics, and energy storage.
