Abstract The tetragonal phase is an indispensable component that plays an important role in forming the morphotropic phase boundary. Herein, the piezoelectric behaviors are systematically investigated in various Pb/Bi-based tetragonal piezoelectric systems as a function of tetragonal distortion using in-situ high-energy synchrotron diffraction. It is found that the tetragonal distortion has a significant influence on piezoelectric properties through constraining the domain switching. Specifically, a critical value of (c/a-1) ≈ 1.5 % is identified, below which the domain switching is significantly activated. The correlation between piezoelectric performance and the cooperative contribution of tetragonal distortion and domain switching has been established: Reducing tetragonal distortion and activating domain switching can enhance the piezoelectric coefficient. Furthermore, an approximate linear coupling between domain switching and lattice strain is confirmed in tetragonal piezoelectric systems. Insights from this work would facilitate the design of high-performance piezoelectrics, by controlling tetragonal distortion and domain switching.

中文翻译：

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四方畸变对原位同步加速器衍射压电材料畴转换和晶格应变的影响

摘要 四方相是不可缺少的组分，在形成同形相界中起重要作用。在这里，使用原位高能同步加速器衍射系统地研究了各种 Pb/Bi 基四方压电系统中的压电行为作为四方畸变的函数。发现四方畸变通过约束畴转换对压电性能有显着影响。具体而言，确定了 (c/a-1) ≈ 1.5 % 的临界值，低于该临界值时域切换被显着激活。已经建立了压电性能与四方畸变和域切换的协同贡献之间的相关性：减少四方畸变和激活畴切换可以提高压电系数。此外，在四方压电系统中证实了域切换和晶格应变之间的近似线性耦合。通过控制四方变形和域切换，这项工作的见解将有助于高性能压电材料的设计。