Abstract
For Na0.5K0.5NbO3(KNN)-based lead-free piezoelectric ceramics, an important phenomenon was found that the piezoelectric properties can be improved remarkably for equivalence substitution while it can’t be improved remarkably for non-equivalence substitution. To find out the real reason for this phenomenon, Li+ and La3+ were used to modify KNN lead-free piezoelectric ceramics by conventional sintering technique. The relaxor characteristic was detected for La3+ modified KNN lead-free piezoelectric ceramics, and this caused low piezoelectric properties. However, the relaxor characteristic can not be detected for Li+ modified KNN lead-free piezoelectric ceramics, and the piezoelectric properties is higher than that of La3+ modified KNN lead-free piezoelectric ceramics. Accordingly, the relaxor characteristic has important effect on structure and electric properties. The results show that equivalence and non-equivalence substitution have important and different effect on structure and performance of KNN ceramics.
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