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ABSTRACT: The electromechanical properties of rhombohedral single crystals Pb(Mg1/3Nb2/3)-Pb(In1/2Nb1/2)-PbTiO3 (PMN-PIN-PT) were investigated under hydrostatic pressure from 0.1 to 456 MPa. Due to pressure-induced morphotropic phase boundary moving, the piezoelectric coefficients and electromechanical coupling factors of PMN-PIN-PT crystals were found to decrease by ∼10% and ∼2%, respectively. The mechanical quality factor Q was found to dramatically decrease, because the domain wall motion and friction between vibrator and pressure-transmitting fluid were enhanced under hydrostatic pressure. On the other hand, the pressure induced depolarization and phase transition were not observed in the experimental pressure range.
Applied Physics Letters 08/2011; 99(6):062903-062903-3. · 3.84 Impact Factor
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ABSTRACT: The influence of the hydrostatic pressure on the piezoelectric response for tetragonal BaTiO3 and PbTiO3 monodomain crystals is investigated using Landau–Ginzburg–Devonshire phenomenological approach. It is shown that hydrostatic pressure could enhance the piezoelectric properties in some directions of crystals. The piezoelectricy enhancement is attributed to the hydrostatic pressure-induced flattening of the elastic Gibbs free-energy profile and its corresponding dielectric softening. For BaTiO3 at 285 K, with increasing pressure, the free-energy profile tends to become flat along the polar [001]c direction, facilitating the dilatation and contraction of polarization. So the dielectric softens and the d33 obviously increases in the [001]c direction. But in the direction perpendicular to the polarization, the free-energy profile goes to steepen, which restrains the polarization rotation away from the [001]c polar axis and in turn makes the shear piezoelectric coefficient d15 decreased. As a result, the maximum longitudinal piezoelectric coefficient d33*(θ) initially going along [111]c axis finally turns to be along [001]c axis with pressure increasing. Whereas for PbTiO3 at room temperature, both along and perpendicular to the polar axis, the free-energy profile tends to flatten, but the flattening along the polar axis predominates all the time. That is to say, the hydrostatic pressure facilitates the polarization dilatation and contraction along the polar axis as well as the polarization rotation in (100)c plane, d33 and d15 both increase, but longitudinal piezoelectric coefficient d33*(θ) for PbTiO3 always displays its maximum value along the polar [001]c direction and increases continuously with pressure in the computational pressure range.
Journal of Applied Physics 06/2011; 109(11):114111-114111-6. · 2.17 Impact Factor
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ABSTRACT: The effect of hydrostatic pressure on piezoelectric materials is a crucial factor for underwater device design. In this work, the dielectric, elastic, and piezoelectric properties of Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 [PMNT (67/33)] ceramics were investigated under pressure from 0.1 to 455 MPa. The dielectric permittivity and losses were found to increase under hydrostatic pressure due to enhanced domain wall motion. With increasing hydrostatic pressure, the mechanical losses drastically increased, which can be attributed to the increase of both domain wall motion and the friction between pressure-transmitting fluid and piezoelectric vibrators. In addition, piezoelectric coefficients (d33, d31) and electromechanical coupling factors (k33, k31) were found to decrease with increasing pressure, owing to the pressure-induced depolarization for PMNT ceramics.
Journal of the American Ceramic Society 03/2011; 94(9):2946 - 2950. · 2.27 Impact Factor
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ABSTRACT: The dielectric properties of [001]-oriented 0.76Pb(Mg1/3Nb2/3)O3–0.24PbTiO3 (PMN–PT24) crystal were investigated as a function of frequency and temperature under hydrostatic pressure. The dependence of remnant polarization of the PMN–PT24 crystal on pressure was also measured. The results showed that both the temperature of the maximum dielectric permittivity T m and the depoling temperature T d of the PMN–PT24 crystal shifted to lower temperature, and the relaxor property became stronger with increasing hydrostatic pressure. The remnant polarization (P r) of the PMN–PT24 crystal decreased linearly with increasing pressure. Consequently, the hydrostatic piezoelectric coefficient, d h, was calculated.
High Pressure Research 06/2010; 30(2):273-279. · 0.78 Impact Factor
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ABSTRACT: The dielectric properties of 0.75Pb(Mg1/3Nb2/3)O3-0.25PbTiO3 (PMN-25PT) ceramic under hydrostatic pressure and pressure-induced phase transition were investigated. PMN-25PT ceramic is pure perovskite with weak relaxation at 1 bar. With increasing hydrostatic pressure, the temperature, T m, of top dielectric constant decreases, °C/kbar, frequency dispersion and phase transition diffuse increases, remnant polarization decreases continuously. The hydrostatic pressure dependence of dielectric constant () is similar to the temperature dependence of dielectric constant. The relax ferroelectric-paraelectric (RFE-PE) phase transition was induced by hydrostatic pressure and the transition was gradual change process with stronger relaxor behavior than by temperature-induced.
Ferroelectrics. 01/2010; 401(1):218-225.
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ABSTRACT: The hydrostatic pressure dependence of the dielectric response of 0.90Pb(Mg1/3Nb2/3) O3-0.10PbTiO3 (abbreviated to PMN-0.10PT hereafter) ceramic was studied. The effect of hydrostatic pressure shows several obvious characteristics: suppression of dielectric permittivity anomaly with −103/kbar, downward shift of Tm with −2.8 K/kbar at 10 kHz frequency and increase of ΔTm (Tm100kHz-Tm0.4kHz). Analysis of the dielectric response of the PMN-0.10PT indicates that hydrostatic pressure results in a decrease of the correlation radius rc of polar nanodomains, strengthening the glasslike character of the response.
Ferroelectrics 01/2010; 401(1):86-91. · 0.39 Impact Factor
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ABSTRACT: The piezoelectric properties of 31-mode resonators of lead zirconate titanate ceramics under hydrostatic pressure from 0.1 to 325MPa were evaluated by a fitting method, in which mechanical loss was taken into account. Our results based on the fitting method showed a hydrostatic pressure independent tendency of the piezoelectric coefficient and the electromechanical coupling factor because the adopted PZT ceramic can be considered as a linear system in our experiment, while two misleading tendencies of piezoelectric coefficient were obtained based on the resonance method when ignoring the contribution of the mechanical loss.
