Heterostrain-enabled ultrahigh electrostrain in lead-free piezoelectric
Wei Feng1, Bingcheng Luo2, Shuaishuai Bian1
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China.
Nature Communications
|August 29, 2022
Summary
Scientists developed lead-free piezoelectric ceramics with ultrahigh electrostrain (2.3%) by engineering atomic defects and domain structures. This breakthrough offers environmentally friendly, high-performance materials for advanced actuator applications.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramic Engineering
Background:
- Piezoelectric materials convert electrical energy to mechanical energy, crucial for actuators.
- Traditional piezoelectrics often contain toxic lead, driving research into lead-free alternatives.
- Achieving high strain in lead-free polycrystalline piezoelectrics remains a significant scientific challenge.
Purpose of the Study:
- To develop a novel strategy for enhancing electrostrain in lead-free piezoelectric materials.
- To overcome limitations in current lead-free piezoelectric ceramics regarding strain performance.
- To engineer materials for high-performance, environmentally friendly actuator applications.
Main Methods:
- Atomic-scale defect engineering to create "heterostrain".
- Mesoscale domain engineering to optimize material structure.
- Fabrication and characterization of lead-free polycrystalline ceramics.
Main Results:
- Achieved an ultrahigh electrostrain of 2.3% at 220°C.
- The achieved strain surpasses current state-of-the-art lead-free and lead-based piezoelectric materials.
- Demonstrated a viable approach for high-strain, low-cost, environmentally friendly piezoelectrics.
Conclusions:
- The developed "heterostrain" design strategy effectively enhances electrostrain in lead-free ceramics.
- This research provides a pathway for realizing high-performance, sustainable piezoelectric actuators.
- The findings pave the way for diverse applications requiring advanced piezoelectric functionalities.
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