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中文摘要：
采用传统固相法制备了（Na0.8K0.2）0.5Bi0.5TiO3＋xmol%Co3＋（BNKT-xCo,x=0-8）无铅压电陶瓷,研究了Co2O3掺杂对BNKT陶瓷的显微结构与电学性能的影响。研究表明：适量的Co2O3掺杂促进了晶粒生长,纯BNKT陶瓷样品在介电温谱上有2个介电反常峰Td和Tm,Co2O3掺杂后使所有陶瓷样品的第一个介电反常峰Td消失,表明Co3＋抑制铁电-反铁电相变。室温下样品的介电、铁电和压电性能表明Co2O3起硬性掺杂效应。当x=7时陶瓷样品电性能最佳,其中机械品质因子Qm=498,介电损耗tanδ=2.3%（1kHz）,压电常数d33=103pC/N,平面机电耦合系数kp=27%。
英文摘要：
Lead-free piezoelectric ceramics （Na0.8K0.2）0.5Bi0.5TiO3＋xmol%Co3＋（BNKT-xCo,x=0-8） are prepared by the solid state reaction method. Effects of the amount of Co2O3 on the microstructure and electrical properties are studied. The results indicate the suitable Co2O3 addition is beneficial to the growing of grain size. There are two abnormal dielectric peaks of Td and Tm appeared in curves of dielectric constant vs temperature for pure BNKT ceramics. However, the first dielectric peak Td disappears after the addition of Co2O3, which means that the transition from ferroelectric to anti-ferroelectric phase has been eliminated. The addition of Co2O3 tailored the dielectric, ferroelectric and piezoelectric properties at room temperature basically following a hard doped effect. When x=7 ceramics samples exhibit good performance with mechanical quality factor Qm=478, dissipation factor tan δ =2.3%（lkHz）, piezoelectric constant d33--103 and planar electromechanical coupling kp=24%.
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