Simulation of current-jumping phenomena in PbTiO_3-Pb(Sc_<1/2>Nb_<1/2>)O_3 system piezoelectric ceramics

概要

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The nonlinear piezoelectric phenomena were investigated in PbTiO_3-Pb(Sc_<1/2>Nb_<1/2>)O_3 (PT-PSN) system ceramics, which is reported to be the ferroelectric relaxer material having a large d_<31> constant. The calculated values for current-jumping and resonance-frequency change obtained using our old simulation, in which only ξ_<D31> 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, ζ_<D31>, in the calculation. Furthermore, a nonlinear loss term was incorporated into the calculation by handing ξ_<D31> as a complex number. The use of complex ξ_<D31> enabled the exact prediction of the drop point of the current, which has never been possible.
社団法人日本セラミックス協会の論文
2008-11-01