Photostriction of lanthanum‐modified lead zirconate titanate (PLZT) was commonly attributed to the combination of anomalous photovoltaic effect and inverse piezoelectric response. Herein, distinct photostrictions are detected in both poled and unpoled PLZT ceramics under 405 and 520 nm laser illuminations. The maximum photostriction around 0.09% is obtained in unpoled PLZT under 405 nm illumination, which is nine times of previously reported value that deduced from poled PLZT. The photoelectric and photovoltaic characterizations of poled/unpoled PLZT further evidence that the detected photostriction shows no direct association with the photovoltage‐induced inverse piezoresponse. The light‐induced microstructure changes observed by in situ piezoelectric force microscopy are revealed by domain evolutions along the boundaries. The possible photostriction mechanism of PLZT is attributed to the strong photo‐induced electron‐lattice coupling, which is suggested by the light‐induced changes of the Zr/Ti‐O‐Zr/Ti bonds reflected by the power‐dependent Raman spectra. This study extends the photostriction of PLZT to visible light range and will also stimulate reappraisal of the underlying mechanism of photostrictive effect involving ferroelectrics.

中文翻译：

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重新研究镧改性的钛酸锆钛酸铅铁电材料中的光致伸缩效应

镧改性锆钛酸铅（PLZT）的光致伸缩通常归因于异常光伏效应和逆压电响应的组合。在此，在405和520 nm激光照射下，极化和非极化PLZT陶瓷均检测到明显的光致伸缩。在405 nm的光照下，未极化PLZT的最大光解度约为0.09％，是以前报道的极化极化PLZT值的9倍。极化/非极化PLZT的光电特性进一步证明，检测到的光解与光电压诱导的逆压电响应没有直接关系。沿边界的畴演化揭示了通过原位压电力显微镜观察到的光致微观结构变化。PLZT可能的分光机理归因于强光诱导的电子-晶格耦合，这是由功率依赖型拉曼光谱所反映的Zr / Ti-O-Zr / Ti键的光诱导变化所暗示的。这项研究将PLZT的光解作用扩展到可见光范围，还将刺激对涉及铁电体的光致伸缩作用的潜在机理的重新评估。