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中文摘要：
铅基压电陶瓷在制备、使用及废弃处理过程中都会造成环境污染，随着环保意识的增强，无铅压电陶瓷必将逐步替代铅基压电陶瓷。Na0．5K0．5NbO3是一种很有潜力的无铅压电陶瓷，掺杂各种元素提升Na0．5K0．5NbO3陶瓷的压电性能成为当今研究热点之一。本研究以Ag2O、Na2CO3、K2CO3、Nb2O5为原料，经750℃焙烧分别合成了Na0．5K0.5NbO3和AgNbO3粉料，再经配料、混料与成型，在1060℃埋粉烧结，制备出Ag^＋掺杂的Na0.5K0．5NbO3无铅压电陶瓷（xAgNbO3-（1-x）Na0.5K0．5NbO3，ANKN），并在较宽成分范围内（Ag^＋含量，x=0-50at％）系统研究了Ag^＋掺杂对ANKN陶瓷性能的影响。XRD结果表明，ANKN陶瓷的主相为钙钛矿型结构，当x〉16at％，开始出现K5-75Nb10．85O30杂相，随着Ag掺杂量的增加，杂相的衍射峰增强。电学性能测试结果表明，当x〈20at％，随Ag掺杂量的增加ANKN陶瓷的压电常数、介电常数等略有升高；当x〉20at％，ANKN陶瓷的各项性能均开始降低；Ag掺加量为x=16at％时ANKN陶瓷性能最佳，压电常数d33达到110pC／N，平面机电耦合系数kp为30％，相对介电常数εr为358，居里温度Tc为300℃。
英文摘要：
Although lead-based piezoelectric ceramics are widely used due to their excellent piezoelectric properties, discharged toxic PbO during processing causes environmental pollution, so there is an ever-increasing demand for lead-free piezoelectric materials. （Na, K）NbO3 base ceramics is a promising candidate for lead-free piezoelectric ceramics, and the doping effect on the （Na, K） NbO3 ceramics becomes a hot research. In this study, a series of Ag^＋ doped Na0.5K0.5NbO3 （ANKN） ceramics were synthesized by mixing and sintering Na0.5K0.5NbO3 and AgNbO3 powders at 1060 ℃ for 2 h, in which those two powders were first fabricated by calcining the raw materials of Ag2O, Na2CO3, K2CO3 and Nb2O5 at 750 ℃. The effect of Ag^＋ doping on electrical properties of ANKN ceramics within a wide composition range （Ag^＋ content, x=0-50 at%） was investigated. XRD patterns indicated that the main phase of ANKN is still perovskite-type structure similar to that of NKN. A K5.75Nb10.85O30-like phase appeared at x〉16 at%, and the intensity of the diffraction peaks increased with increasing Ag content. The piezoelectric constant and dielectric constant increased with increasing Ag content from 0 to 20 at%. The ANKN ceramics doped with 16 at% Ag showed the best performance in which the piezoelectric constant d33 and Curie temperature Tc reached 110 pC/N and 300 ℃, Planar electromechanical coupling factor kp and relative dielectric constant εr were 30 % and 358, respectively.
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