单斜晶系
压电
材料科学
各向异性
压电系数
极化(电化学)
凝聚态物理
结晶学
复合材料
光学
晶体结构
化学
物理
物理化学
作者
Zhong Fang,Xiangwei Guo,Heng Zhang,Y. J. Wang,Yun Tang,Yin Zhu,Xiang Ma
摘要
By combining phase-field simulations and first-principles calculations, we proposed to modulate the monoclinic phases of high-index-oriented PbTiO3 films through epitaxial anisotropic strain to obtain superior piezoelectric performance. It was found that the piezoelectric coefficients e22 were remarkably enhanced (up to 2400%) in both (111)- and (110)-oriented PbTiO3 films. The excellent piezoelectric property is mainly attributed to the polarization rotation due to the flatter energy landscapes in the monoclinic phases, while the variation of polarization magnitude contributes little to piezoelectricity. Our research suggests modulating material properties through anisotropic strain, which might bring some insight to other functional materials.
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