Pressure-induced Suppression of Piezoelectric Response in a 0.5Pb(Ni_1/3Nb_2/3)O₃-0.5Pb(Zr_0.7Ti_0.3)O₃ Ceramic Near a Morphotropic Phase Boundary

Abstract

Electromechanical properties of 0.5Pb(Ni_1/3Nb_2/3)O₃-0.5Pb(Zr_0.7Ti_0.3)O₃ (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 d₃₃ = 850 pC/N and d₃₁ = 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 k₃₁ 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.

Keywords:

• Relaxor ferroelectrics
• piezoelectricity
• PZT
• pressure effects
• domain structures
• ferroelasticity