中文摘要：

无铅的压电的陶艺(Na_(0.5 )K_(0.5x ) Li_x；) NbO_3 (x=0.057-0.066 ) 被一种平常的 sintering 技术综合。为 K 的代替的李能导致结构的失真，它极大地改进居里温度(Tc ) 。由增加适当 LiNbO3 内容，平面模式的压电的经常的 d33 价值活动范围 202-212 pC/N.Electromechanical 系数比报导到达绝缘的损失低于 2.6% 的 44.4%-46.8%.The，它低得多(大约 50%) 。Tc (Na0.5K_(0.5x ) Li_x；) NbO3 (x=0.057-0.066 ) 在 490-510 ° C 的范围，比的高的至少 70 ° C 纯(Na0.5K0.5 ) NbO3 陶艺。结果显示出那(Na0.5K_(0.5x ) Li_x ) NbO3 陶器是一种好无铅的高温度的压电的材料。

英文摘要：

Lead-free piezoelectric ceramics （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） were synthesized by an ordinary sin-tering technique. Substituting Li for K can lead to structural distortion, which improves the Curie temperature （To） greatly. By adding appropriate LiNbO3 content, piezoelectric constant d33 values reach 202-212 pC/N. Electromechanical coefficients of the planar mode reach 44.4%-46.8%. The dielectric loss is below 2.6%, which is much lower than reported （about 50%）. The To of （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） is in the range of 490-510℃, at least 70℃ higher than that of pure （Na0.5K0.5）NbO3 ceramics. The results show that （Na0.5K0.5-xLix）NbO3 ceramic is a kind of good lead-free high-temperature piezoelectric material.