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Abstract:We studied sintering temperature to enhance the piezoelectric properties of 0.98(Na0.5K0.5)NbO3-0.02Li(Sb0.17Ta0.83)O3+0.01wt%ZnO (hereafter NKN-LST+ZnO) lead free piezoelectric ceramics. The synthesis and sintering method were the conventional solid state reaction method and sintering was executed at 1,080∼1,120℃. We found that NKN-LST+ZnO ceramics at optimal sintering temperature showed the improved piezoelectric properties at the optimal sintering temperature. The NKN-LST+ZnO ceramics show good performance with piezoelectric constant d33= 153 pC/N sintered at 1,090℃. The results reveal that NKN-LST+ZnO ceramics are promising candidate materials for lead-free piezoelectric application.

The influence of CuO addition on what of the (Ba,Sr)TiO3 ceramics was studied. The sintering temperature of (Ba,Sr)TiO3 ceramics was lowered by the addition of CuO additives. The 1 -5 wt% CuO were selected and employed as the sintering aids. Low-Temperature Co-fired Ceramic technologies are popular technologies used in the manufacture of microwave devices. In this study, crystalline and electrical properties of CuO doped (Ba,Sr)TiO3 ceramics were investigated to determine the low temperature sintering properties. The addition of CuO to (Ba,Sr)TiO3 lowered the sintering temperature from 1350℃ to 1150℃. The dependence of the sintering temperature shrinkage rate and mechanism of CuO doped (Ba,Sr)TiO3 ceramics are investigated and discussed. Also, the crystalline structure of CuOdoped (Ba,Sr)TiO3 ceramics is discussed by the X-ray diffraction (XRD) method.