MnO_2掺杂对KNN基陶瓷性能的影响

Effect of MnO_2 Doping on the Properties of KNN Matrix Ceramics

采用固态烧结法对K_(0.47)Na_(0.53)Nb O_3(KNN)进行x Mn O_2(x=0,1,1.5和3 mol%)掺杂改性研究,探讨了Mn O_2掺杂对KNN的物相组成、微观形貌及介电常数、介电损耗等性能的影响。结果表明:通过固态烧结法成功制备了掺x Mn O_2的K_(0.47)Na_(0.53)Nb O_3压电陶瓷材料,Mn O_2的掺杂均得到了纯的钙钛矿相,并且随着Mn O_2掺杂量的增加,KNN的晶粒尺寸趋于均匀,气孔减少,致密度提高;适量Mn O_2的掺杂使(K0.47Na0.53)Nb O_3陶瓷材料的压电常数增大,介电损耗减小。

The K0.47Na0.53 NbO3 （KNN） doping with xMnO2 （x=0, 1, 1.5 and 3 mol%） were prepared by solid-state sintering process, and the phase composition, microstructure, dielectric constant and loss properties were investigated. The results show that the xMnO2-K0.47Na0.53 NbO3 （KNN） piezoelectric ceramics could be prepared with solid-state sintering, the pure perovskite phase could get with doping of MnO2, and the grain size of KNN tends to be uniform, porosity decreases, density increase with the increasing of MnO2 doping amount. The ceramic piezoelectric constant of KNN will be increasing and the dielectric loss decreasing with a moderate amount of MnO2 doping.