Li Hongjiang, Chen Ning, Xing Jie, Liu Wenbin, Tan Zhi, Tang Manjing, Chen Hao, Mo Mingyue, Zhu Jianguo
College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610064, China.
ACS Appl Mater Interfaces. 2025 Apr 16;17(15):22892-22902. doi: 10.1021/acsami.4c22607. Epub 2025 Apr 1.
Lead-free piezoelectric materials with excellent electromechanical compatibility are essential for industrial applications. However, attaining both a large piezoelectric coefficient () and a high mechanical quality factor () is generally regarded as challenging because of the inherent trade-off among these properties. In this work, the reduction of internal defects and the redistribution of the second phase in potassium sodium niobate (KNN) based composite ceramics are achieved through a heat treatment technique. This method can achieve a significant improvement of electromechanical properties ( = 415 pC/N and = 120), which effectively overcomes the contradiction between piezoelectric properties and mechanical losses. Structural characterizations indicated that the improved electromechanical performance of the annealed KNN composite ceramics could be attributed to the optimized internal defects and the extrinsic local stress field. These findings offer a promising route to enhance the commercial feasibility of lead-free KNN-based piezoelectric ceramics, representing significant progress in the development of high-performance and environmentally friendly piezoelectric materials.
具有优异机电兼容性的无铅压电材料对于工业应用至关重要。然而，由于这些性能之间存在固有的权衡关系，同时获得大的压电系数（）和高的机械品质因数（）通常被认为具有挑战性。在这项工作中，通过热处理技术实现了铌酸钾钠（KNN）基复合陶瓷内部缺陷的减少和第二相的重新分布。该方法可以显著提高机电性能（ = 415 pC/N和 = 120），有效克服了压电性能与机械损耗之间的矛盾。结构表征表明，退火后的KNN复合陶瓷机电性能的改善可归因于内部缺陷的优化和外在局部应力场。这些发现为提高无铅KNN基压电陶瓷的商业可行性提供了一条有前景的途径，代表了高性能和环境友好型压电材料发展的重大进展。
