Abstract
The effects of Li substitution on the nonlinear piezoelectricity in lead-free (K,Na)NbO3 (KNN) system ceramics were studied. The nonlinear piezoelectricity causes nonlinear phenomena such as the generation of nonlinear voltages, a change in the resonance frequency, and current jumping under high-power vibration. The magnitude of the nonlinear piezoelectricity was estimated by measuring the third-harmonic voltage generated in samples during constant-current driving. With the increase in the amount of substituted Li, the nonlinear piezoelectricity decreased and became a minimum at the phase boundary composition. The nonlinear piezoelectric coefficient at the phase boundary composition was less than one-tenth of the value in the nonsubstituted KNN ceramic.
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