Giant Piezoelectric Coefficient in Lead-Free BiFe0.975Ti0.025O3–CaTiO3 Solid Solution Thin Films
Giant Piezoelectric Coefficient in Lead-Free BiFe0.975Ti0.025O3–CaTiO3 Solid Solution Thin Films
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DOI：
10.1021/acs.cgd.1c00697
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发表时间：
2021-09
影响因子：
3.8
通讯作者：
M. Shu;Bingbing Yang;M. Liu;Shunjin Zhu;Sumei Li;Chengbing Pan;Jiamingzhu Wang;L. Yin;Jie Yang;Xuebin Zhu;Yuping Sun
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文献类型：
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作者：
M. Shu;Bingbing Yang;M. Liu;Shunjin Zhu;Sumei Li;Chengbing Pan;Jiamingzhu Wang;L. Yin;Jie Yang;Xuebin Zhu;Yuping Sun
寻找具有高压电系数的无铅压电薄膜，有利于在微机电系统中的应用。固溶体法是提高压电陶瓷性能的有效途径。本文报道了多晶（1 -x）BiFe_（0.975）Ti_（0.025）O_（3-x）CaTiO_3薄膜的压电性能。0.76BiFe0.975Ti0.025O3- 0.24CaTiO3薄膜的有效压电系数高达542 pm/V，这是由于菱方相和准立方相的共存以及生长动力学的增强导致了薄膜的介电常数和反极化。结果表明，BiFeO 3基无铅压电薄膜的有效压电系数大于500 pm/V。
Searching for lead-free piezoelectric thin films with a high piezoelectric coefficient is beneficial for applications in microelectromechanical systems. The solid solution method is verified as an effective route to largely improve the piezoelectric performance. Herein, we report the piezoelectric properties in polycrystalline (1 –x)BiFe0.975Ti0.025O3–xCaTiO3thin films. A giant effective piezoelectric coefficient of 542 pm/V has been achieved in 0.76BiFe0.975Ti0.025O3–0.24CaTiO3thin films because of the enhanced dielectric constant as well as remanent polarization, which originated from the coexistence of rhombohedral and pseudo-cubic phases and enhanced growth kinetics. The results indicate a type of lead-free piezoelectric thin film based on BiFeO3with the effective piezoelectric coefficient larger than 500 pm/V.