基于BST微悬臂梁横向挠曲电系数的测定  

Measurement of the Transverse Flexoelectric Coefficient Based on BST Micro-cantilever Beam

作　　者：李康[1] 骆英[1] 徐晨光[1] 许伯强[1] 王晶晶[1] 桑胜[1] 

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《压电与声光》2014年第5期798-800,804,共4页Piezoelectrics & Acoustooptics

基　　金：教育部博士点基金优先发展领域课题基金资助项目(20123227130002);国家自然科学基金资助项目(11272138)

摘　　要：挠曲电材料具有高力电耦合系数、尺度效应及对环境温度无特定要求等特点,有望用于传感器、作动器及结构健康监测等领域。基于钛酸锶钡(BST)微悬臂梁结构,实验分析了横向挠曲电系数对驱动频率的依赖关系,并讨论了尺度效应。利用压电微驱动器的低频激振,获得了横向挠曲电系数。结果表明,作为传感器,挠曲电材料在传感方面呈现出明显的尺度效应,当梁的厚度减小到微纳米尺度时,其传感特性将优于压电材料。Due to the high electromechanical coupling coefficient, scale effect and no strict requirements on the working temperature, the flexoelectric materials are expected to be used for sensors, actuators, structural health monitoring, etc. Based on the barium strontium titanate（BST） micro-cantilever beam structure, the dependence of driving frequency on the transverse flexoelectric coefficient was analyzed, and scale effect was discussed. The transverse flexoelectric coefficient was obtained by using the low-frequency vibration of the piezoelectric micro-actuator. The results show that flexoelectric materials present obvious scale effect in the aspect of sensing and the sensing property will be superior to piezoelectric materials when the thickness of the beam decreases to micro or nano scale.

关 键 词：钛酸锶钡(BST) 挠曲电效应 应变梯度 电极化 微悬臂梁 

分 类 号：TN384[电子电信—物理电子学]