铋层状结构铁电体(BLSF)是高温压电传感器、换能器及驱动器等敏感式器件应用领域研究的热点材料之一，如何进一步提高其压电/铁电性能是拓展其在高温、高频领域应用的关键。本项目拟采用离子掺杂改性结合特殊烧结方法来实现对BLSF压电陶瓷的微观结构调控，研究离子掺杂改性和烧结工艺对其微观结构的协同影响规律，以期建立离子掺杂改性、烧结工艺和微观结构之间的关联性，制备出具有均匀细小晶粒结构的BLSF压电陶瓷，并找到通过微观结构调控来提高BLSF压电陶瓷高温压电/铁电性能的有效途径。测试BLSF压电陶瓷在高温下的绝缘电阻和交流阻抗特性，通过活化能的计算来探讨其高温漏导行为及内在机制，深入分析微观结构调控对增强其高温绝缘电阻所发挥的重要作用。本研究可望为拓展BLSF压电陶瓷在高温、高频领域应用提供重要的科学依据和理论指导，促进信息功能系统关键压电敏感陶瓷材料的发展。

Bismuth layer structural ferroelectric (BLSF) materials have been a hot research topic for high temperature sensitive device applications such as piezoelectric sensors, transducers and actuators. How to further improve the piezoelectric/ferroelectric properties is the key to expand their applications in high temperature and high frequency conditions. This project intends to achieve microstructure control in BLSF piezoelectric ceramics using ions modification combined with a special sintering process. The co-effect of ions modification and sintering process on the microstructure is investigated to build the co-relationship among ions modification, sintering process and microstructure. BLSF piezoelectric ceramics with uniform and fine grains are prepared, and an effective way to improve the high temperature piezoelectric/ferroelectric properties of BLSF piezoelectric ceramics by controlling the microstructure is obtained. The resistivity and AC impedance characteristics of BLSF piezoelectric ceramics at high temperature are tested, and the high temperature leakage conduction behavior and mechanism are discussed by the calculation of the activation energy. The important role of microstructure control to enhance the high temperature resistivity of BLSF piezoelectric ceramics is in depth analyzed. This project can provide important scientific basis and theoretical guidance to expand the application of BLSF piezoelectric ceramics in high temperature and high frequency conditions, and promote the research of key piezoelectric sensitive ceramic materials in information function systems.