相变
压电
相界
材料科学
相(物质)
同步加速器
压电响应力显微镜
四方晶系
压电系数
凝聚态物理
正交晶系
衍射
铁电性
纳米技术
化学物理
光电子学
物理
电介质
化学
光学
复合材料
有机化学
作者
Mao‐Hua Zhang,Chen Shen,Changhao Zhao,Mian Dai,Fang‐Zhou Yao,Bo Wu,Jian Ma,Nan Hu,Dawei Wang,Qibin Yuan,Lucas Lemos da Silva,Lovro Fulanović,Alexander Schökel,Peitao Liu,Hongbin Zhang,Jing‐Feng Li,Nan Zhang,Ke Wang,Jürgen Rödel,Manuel Hinterstein
标识
DOI:10.1038/s41467-022-31158-x
摘要
Here, we introduce phase change mechanisms in lead-free piezoceramics as a strategy to utilize attendant volume change for harvesting large electrostrain. In the newly developed (K,Na)NbO3 solid-solution at the polymorphic phase boundary we combine atomic mapping of the local polar vector with in situ synchrotron X-ray diffraction and density functional theory to uncover the phase change and interpret its underlying nature. We demonstrate that an electric field-induced phase transition between orthorhombic and tetragonal phases triggers a dramatic volume change and contributes to a huge effective piezoelectric coefficient of 1250 pm V-1 along specific crystallographic directions. The existence of the phase transition is validated by a significant volume change evidenced by the simultaneous recording of macroscopic longitudinal and transverse strain. The principle of using phase transition to promote electrostrain provides broader design flexibility in the development of high-performance piezoelectric materials and opens the door for the discovery of high-performance future functional oxides.
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