Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore.
Department of Materials Science and Engineering, National University of Singapore, 117575 Singapore.
Science. 2020 Jul 17;369(6501):292-297. doi: 10.1126/science.abb3209.
High-performance piezoelectric materials are critical components for electromechanical sensors and actuators. For more than 60 years, the main strategy for obtaining large piezoelectric response has been to construct multiphase boundaries, where nanoscale domains with local structural and polar heterogeneity are formed, by tuning complex chemical compositions. We used a different strategy to emulate such local heterogeneity by forming nanopillar regions in perovskite oxide thin films. We obtained a giant effective piezoelectric coefficient [Formula: see text] of ~1098 picometers per volt with a high Curie temperature of ~450°C. Our lead-free composition of sodium-deficient sodium niobate contains only three elements (Na, Nb, and O). The formation of local heterogeneity with nanopillars in the perovskite structure could be the basis for a general approach to designing and optimizing various functional materials.
高性能压电材料是机电传感器和执行器的关键组件。60 多年来，获得大压电响应的主要策略一直是通过调整复杂的化学成分来构建多相边界，在多相边界中形成具有局部结构和极性各向异性的纳米尺度畴。我们使用了一种不同的策略，通过在钙钛矿氧化物薄膜中形成纳米柱区域来模拟这种局部各向异性。我们获得了一个巨大的有效压电系数[Formula: see text]约为 1098 皮米每伏特，具有约 450°C 的高居里温度。我们的无铅组成的钠缺钠铌酸钠只包含三种元素（Na、Nb 和 O）。在钙钛矿结构中形成具有纳米柱的局部各向异性可能是设计和优化各种功能材料的通用方法的基础。
