中文摘要：

从准同型相界、压电活性、退极化温度和掺杂改性等方面，综述了NBT-KBT-BT三元系无铅压电陶瓷的最新进展，对其发展进行了展望。研究表明，三方的NBT和四方的KBT-BT之间存在准晶相界，准晶相界附近的组分具有高压电性能，而四方相区的组分具有高的退极化温度。今后的研究重点将集中于A位或B位取代对NBT-KBT-BT体系的压电性能和退极化行为的作用，三元系陶瓷粉体烧结活性的提高以及新型陶瓷制备技术，如晶粒定向陶瓷制备工艺等。

英文摘要：

Based on the latest researches at home and abroad, the current progress in the investigation of lead-free piezoelectric ternary system NBT- KBT- BT in the view of morphotropic phase boundary （MPB）, piezoelectric properties, depolarization temperature and doping effect are summarized. Studies indicated that there exists morphotropic phase boundary （MPB） between rhombohedral BNT and tetragonal KBT-BT; higher piezoelectric properties were obtained in the compositions near MPB while higher depolarization temperature was realized in the tetragonal compositions. It is expected that the effects and mechanism of the doping on piezoelectric and depolarization behavior, the activity improving of the ceramic powder, and the new technique of ceramics, such as grain orientation technology, etc. will become the hotspots in the investigation of NBT- KBT- BT system.