中文摘要：

利用XRD等现代分析技术，研究了Bi0．5（Na1-x-yKxLiy）0．5TiO3系无铅压电陶瓷的合成温度，烧成工艺条件对陶瓷晶体结构和压电性能的影响。同时研究了极化工艺条件对材料压电性能的影响。结果表明，合成温度的提高有利于主晶相的形成，适当延长烧结保温时间有利于提高材料的压电性能。该体系随着K含量的增加，烧结温度提高及范围变窄。当提高极化电场和极化温度时，有利于压电性能的提高，但过高的温度因受材料高温下退极化的影响而导致材料压电性能变差。

英文摘要：

The effects of the synthetic temperature and sintering technique on the structure and piezoelectric properties of Bi0.5（Na1-x-yKxLiy）0.5TiO3 system leadless piezoelectric ceramics were studied by XRD and other analytic method. The effect of polarization technique on the piezoelectric property has also been studied. It showed that the formation of the main crystal phase was profited from increasing synthetic temperature and proper prolonging holding time is helpful for increasing the piezoelectric properties of the ceramics. With increasing the content of potassium （K） in this system, the sintering temperature was increased and the sintering temperature range was narrowed down. When the polarization electric field was enhanced and the polarization temperature was increased, the piezoelectric properties were improved. But if the polarization temperature was too high, the piezoelectric properties became worse because of the depolarization at high temperature.