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Excellent Electromechanical Compatibility in Alkaline Niobate Composite Achieved by Optimizing Internal Defects and
Hongjiang Li1, Ning Chen1, Jie Xing1
1College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610064, China.
ACS Applied Materials & Interfaces
|April 1, 2025
Summary
Heat treatment enhances lead-free potassium sodium niobate (KNN) ceramics, improving piezoelectric properties and mechanical quality. This overcomes the trade-off, making KNN a viable eco-friendly alternative for industrial applications.
Area of Science:
- Materials Science
- Solid State Physics
- Ceramic Engineering
Background:
- Lead-free piezoelectric materials are crucial for sustainable industrial applications.
- A key challenge is balancing high piezoelectric coefficients (d33) with mechanical quality factors (Qm).
- Potassium sodium niobate (KNN)-based ceramics offer a promising lead-free alternative but require property optimization.
Purpose of the Study:
- To improve the electromechanical properties of KNN-based composite ceramics.
- To overcome the inherent trade-off between piezoelectric coefficients and mechanical losses.
- To enhance the commercial feasibility of lead-free piezoelectric materials.
Main Methods:
- Utilized a heat treatment technique on KNN-based composite ceramics.
- Focused on reducing internal defects and redistributing the second phase.
- Conducted structural characterizations to analyze performance improvements.
Main Results:
- Achieved significant improvements in electromechanical properties: d33 = 415 pC/N and Qm = 120.
- Successfully reduced internal defects and optimized the second phase distribution.
- Demonstrated an effective method to overcome the piezoelectric property vs. mechanical loss contradiction.
Conclusions:
- The heat treatment technique optimizes internal defects and local stress fields in KNN ceramics.
- This approach significantly enhances electromechanical performance, offering a promising route for commercialization.
- The findings represent substantial progress in developing high-performance, environmentally friendly piezoelectric materials.
