Effects of CuO Doping on Microstructure of KNN-Based Ceramics
In order to understand the effect of different doping amounts of flux CuO on the microstructure of KNN lead-free piezoelectric ceramics,samples of KNN+1.5%ZnO+x%CuO(x=0,1.0,1.5,2.0,2.5,3.00,mole percent)are prepared by solid phase sintering process.The effects of CuO on the bulk density,phase structure and microstructure of KNN+1.5%Zno-based lead-free piezoelectric ceramics are investigated.The results show that the density of KNN lead-free piezoelectric ceramics is improved to a certain extent after doping CuO and ZnO,and the flux and piezoelectric ceramics can be completely solid dissolved after sintering.The ceramic particles grow bigger with the increase of the doping amount of CuO.When 2%CuO is doped,the lead free piezoelectric ceramic sample is the densest,its density is 4.28 g/cm3.
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