Pressure-induced Suppression of Piezoelectric Response in a 0.5Pb(Ni_(1/3)Nb_(2/3))O_3- 0.5Pb(Zr_(0.7)Ti_(0.3))O_3 Ceramic Near a Morphotropic Phase Boundary

摘要

Electromechanical properties of 0.5Pb(Ni_(1/3)Nb_(2/3))O_3- 0.5Pb(Zr_(0.7)Ti_(0.3))O_3 (0.5PNN-0.5PZT(0.7/0.3)) ceramics near a morphotropic phase boundary were investigated under the hydrostatic pressure p up to 600 MPa at room temperature, where the piezoelectric constants d_(33) = 850 pC/N and d_(31) = 332 pC/N were obtained in this material. The remarkable change in the pressure dependence of the electromechanical response was found, where the resonance and antiresonance curves in impedance and phase in k_(31) mode for the transverse electromechanical property of 0.5PNN-0.5PZT(0.7/0.3) decrease with increasing pressure, and disappear completely at about p = 600 MPa. It was also confirmed that after removal of applied pressures, the electromechanical response recovers. Accompanied with such suppression of piezoelectric response, the increase in 30% of the permittivity ε_r with increasing p, was observed.