Abstract
The electromechanical and dielectric responses in transverse and longitudinal modes for relaxor ferroelectric solid solution Pb(Mg1∕3Nb2∕3)O3–PbTiO3 (PMNT) near a morphotropic phase boundary composition were investigated under hydrostatic pressures up to 700MPa at 25°C. The effect of pressure on their responses remarkably appeared. Their electromechanical suppression in PMNT single crystal and ceramics occurs at each pressure, corresponding to electromechanical coupling coefficient k. The permittivity ε increased with pressure-induced electromechanical suppression. The change in ε with such suppression corresponds to k. Such phenomena were considered to be due to the increase in piezoelectric load based on decrease of domain size coming from increase in free energy with pressures.
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