Abstract
The nonlinear piezoelectric phenomena were investigated in PbTiO3-Pb(Sc1/2Nb1/2)O3 (PT-PSN) system ceramics, which is reported to be the ferroelectric relaxer material having a large d31 constant. The calculated values for current-jumping and resonance-frequency change obtained using our old simulation, in which only ξD31 is used as a nonlinear piezoelectric coefficient of third-higher term for the electrical field, agreed well with the measured values in the region of tetragonal phase. On the other hand, in the rhombohedral region, the calculated values did not agree with the measured values. This disagreement was resolved by reflecting the contribution of a new nonlinear piezoelectric coefficient of third-higher term for mechanical stress, ζD31, in the calculation. Furthermore, a nonlinear loss term was incorporated into the calculation by handing ξD31 as a complex number. The use of complex ξD31 enabled the exact prediction of the drop point of the current, which has never been possible.
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