Stabilizing oxygen vacancies and promoting electrostrain in leadfree potassium niobate-based piezoelectrics over wide temperature ranges  

作　　者：Bingcheng Luo Wei Feng Suwei Dai Hongzhou Song Yunyi Wu Jie Zhang 

机构地区：[1]College of Science,China Agricultural University,Beijing 100083,China [2]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]School of Materials Science and Technology,China University of Geosciences Beijing,Beijing 100083,China [4]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [5]Research Center for Comprehensive Energy Technology,CTG Science and Technology Research Institute,Beijing 100038,China [6]Research Center for Metamaterials,Wuzhen Laboratory,Jiaxing 314500,China

出　　处：《Journal of Advanced Ceramics》2024年第12期1965-1973,共9页先进陶瓷(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12135019 and 52202154);the 2115 Talent Development Program of China Agricultural University,the Scientific Research Start-up Fund for Outstanding Talent of China Agricultural University,Chinese Universities Scientific Fund,and High-performance Computing Platform of China Agricultural University。

摘　　要：Piezoelectric ceramics provide high strain and large driving forces in actuators.A large electrostrain can be realized by the introduction of point defects such as vacancies,interstitial defects,and substitution defects.With Mn doping,a significant increase in the reversible electrostrain from 0.05%to 0.17%could be achieved in potassium niobite lead-free piezoelectric ceramics.The origins of the large electrostrain were analyzed via in situ X-ray diffraction(XRD)under an electric field.The electrostrain and other typical electrical properties of the samples were measured at various temperatures,which enabled the ceramics to perform under a very wide temperature range,such as−80–130℃ for the 0.5 mol%Mn-doped sample with low dielectric loss(≤0.02).More importantly,combined with characterizations of the defect behavior by thermally stimulated depolarization current(TSDC),the failure mechanisms of electrostrain in a hightemperature environment could be revealed,which was associated with synergistic damage to the defects caused by the electric field and high temperature.The results can provide good ideas and a basis for the design of piezoelectric materials with good electrostrain stability over a wide temperature range.

关 键 词：piezoelectric ceramic LEAD-FREE point defect electrostrain thermally stimulated depolarization current(TSDC) 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ132.35[化学工程—无机化工]