Effects of Pressure on Piezoelectric and Dielectric Responses of Relaxor Ferroelectric Solid Solution Pb(Mg1/3Nb2/3)O3–PbTiO3 Binary System Ceramics near a Morphotropic Phase Boundary Composition

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The piezoelectric and dielectric properties of Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMNT) ceramics with compositions near a morphotropic phase boundary (MPB) were investigated under pressures $ p$ up to 700 MPa at 25 °C. The resonance and antiresonance frequency characteristics of impedance and phase in the $k_{31}$ mode for PMNT (67/33) and (69/31) ceramics were observed under various pressures. The effect of pressure on their responses were clearly observed. The electromechanical coupling coefficient $k_{31}$ in the $k_{31}$ mode increases and the electromechanical quality factor $Q$ decreases with increasing $ p$ at pressures lower than 100 MPa. The decrease in $Q$ with $ p$ is due to the scattering of ultrasonic waves from the domain boundary. The relative permittivity $\varepsilon_{\text{r}}$ increases with increasing $ p$. Such increases in both $k$ and $\varepsilon_{\text{r}}$ with $ p$ seem to be related to the increase in topographical domain-wall density associated with monoclinic distortions. At pressures higher than 100 MPa, their electromechanical suppression in PMNT ceramics occurs at each pressure, corresponding to the electromechanical coupling coefficient $k$. $\varepsilon_{\text{r}}$ increases with pressure-induced electromechanical suppression. The change in $\varepsilon_{\text{r}}$ with such suppression corresponds to $k$. Such a phenomenon seems to be due to the increase in piezoelectric load based on the increase in complex domain wall density coming from the increase in free energy with pressure.
2008-09-25

Effects of Pressure on Piezoelectric and Dielectric Responses of Relaxor Ferroelectric Solid Solution Pb(Mg1/3Nb2/3)O3–PbTiO3 Binary System Ceramics near a Morphotropic Phase Boundary Composition

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