PLZT透明陶瓷由于具有优异的电光特性，可以广泛应用到光通信领域的高速电光调制器件。然而，由于PLZT的电光性能具有场致滞后效应，导致器件时效稳定性略差，限制其在动态控制电光器件方面的应用。针对场致滞后这一瓶颈问题，本项目提出梯度组分电光陶瓷设计思路，建立梯度组分分布的调控方法，通过调控A位离子微区组分起伏, 增强纳米极性微区效应, 研制电光特性优异、无明显响应滞后的PLZT梯度电光陶瓷。探索梯度组分结构、纳米极性微区演变运动与电光响应滞后的作用机制，阐明场致滞后产生与克服的内在机理。本项目的开展将解决PLZT陶瓷电光特性在动态响应方面应用的局限性，为电光陶瓷满足国防科技和光通讯技术的应用需求提供基础与理论支撑。

Lanthanum modified lead zirconate titanate (PLZT) transparent ceramics has been extensively applied in electro-optic modulation devices of optical communication, due to the excellent electro-optic behavior. However, PLZT has limitation of application in high-speed dynamic control devices due to poor time stability caused by field-induced hysteresis of electro-optic behavior. In this project, we put forward the design idea of gradient component electro-optic ceramic, and establish the control method of gradient component distribution, and develop the PLZT gradient electro-optic ceramics with excellent electro-optic characteristics and small hysteresis by controlling the component fluctuations of the A-site micro regions and enhancing the PNRs effects. To explore the mechanism of the gradient structure, the evolution of the PNRs and field-induced hysteresis, and clarify the inherent mechanism of the generation and the overcoming of the field induced hysteresis. This project will be carried out to solve the application limitations of PLZT ceramics in the dynamic response devices, providing the basis and theoretical support for electro-optic ceramic applications to meet the needs of national defense science and technology and optical communication technology.