High-Entropy High-Temperature High-Piezoelectricity Ceramics
Jie Wu1,2, Xingshuai Ma2, Donghuan Zhou2
1School of Materials Science and Engineering, Hainan University, Haikou, Hainan, 570228, China.
Advanced Materials (Deerfield Beach, Fla.)
|March 17, 2025
Summary
High-entropy engineering enhances bismuth-layer ceramics for high-temperature piezoelectric applications. This strategy achieves record performance in piezoelectric coefficients and resistivity at elevated temperatures.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramics Engineering
Background:
- High-temperature piezoelectric materials are crucial for demanding applications like aircraft engines and nuclear power.
- Achieving high piezoelectricity, Curie temperature, and electrical resistivity simultaneously remains a significant challenge.
Purpose of the Study:
- To design advanced bismuth-layer high-temperature piezoelectric ceramics using a high-entropy strategy.
- To investigate the structural and polarization mechanisms responsible for enhanced piezoelectric properties.
Main Methods:
- High-entropy strategy applied to bismuth-layer piezoelectric ceramics.
- High-energy synchrotron X-ray diffraction and transmission electron microscopy.
- Quantitative analysis of local polarization and density functional theory calculations.
Main Results:
- Achieved excellent comprehensive piezoelectric performance with a record-high figure of merit (d33*TC).
- Obtained high electrical DC resistivity (1.0 × 106 Ω cm) at 750 °C.
- Identified unique out-of-plane polarization in perovskite layers due to alien atom-occupied vacancies.
Conclusions:
- High-entropy engineering preserves the orthorhombic structure and high Curie temperature.
- Defect-induced polarization and reduced reversal energy barrier enhance piezoelectric flexibility.
- This work offers a new mechanism for designing high-entropy piezoelectric materials with superior properties.
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