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Inducing superior electrical performances in textured CaBi2Ta2O9 based ceramics
Wei Shi1, Mingyue Mo1, Qi Hu1
1College of Materials Science and Engineering, Sichuan University, Chengdu, China. cqscu@scu.edu.cn.
Materials Horizons
|September 1, 2025
Summary
Textured CaBi2Ta2O9 ceramics, achieved through ion doping and hot forging, significantly enhance piezoelectric properties while maintaining high-temperature stability. This breakthrough enables robust ferroelectric devices for extreme environments.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramics Engineering
Background:
- Bismuth-layered structure ferroelectrics (BLSFs) like CaBi2Ta2O9 (CBTa) offer high thermal stability for extreme environment applications.
- Intrinsic limitations of CBTa include suppressed piezoelectric activity due to polarization confinement and high coercive fields.
Purpose of the Study:
- To overcome the limitations of CBTa ceramics and enhance their piezoelectric properties.
- To develop textured CBTa-based ceramics using a synergistic approach of ion doping and hot forging.
- To evaluate the thermal stability and electromechanical performance of the engineered ceramics.
Main Methods:
- Fabrication of textured CBTa-based ceramics via ion doping and hot forging.
- Microstructure characterization to confirm grain orientation and layered perovskite structure.
- Measurement of piezoelectric response (d33), direct-current resistivity (ρ), and Curie temperature (TC).
- Assessment of thermal stability through depoling tests at high temperatures.
Main Results:
- Hot forging induced preferential grain orientation, aligning polar domains.
- Significant enhancement in piezoelectric response (d33 ~ 21.8 pC N-1) was achieved.
- High direct-current resistivity (> 1 × 10^7 Ω cm at 600 °C) and retained Curie temperature (~922 °C).
- Textured ceramics maintained 95% of initial piezoelectric performance after high-temperature depoling.
Conclusions:
- Synergistic ion doping and hot forging effectively engineer the microstructure of BLSFs.
- The developed textured ceramics exhibit superior piezoelectric performance and exceptional thermal stability.
- This microstructure-engineering approach provides a pathway for advanced ferroelectric materials in demanding applications.
