Abstract
The complete set of elastic, dielectric and piezoelectric properties of [0 0 1]-poled domain-engineered 0.72Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (PMN–0.28PT) single crystals was determined. Their ultrahigh piezoelectric constant d33 of 2365 pC N−1 and superior electromechanical coupling coefficients k33, k31 and kt of 93.9%, 76.0% and 63.1%, respectively, are obtained. The temperature dependence of the dielectric properties of [0 0 1]-poled PMN–xPT (x = 0.28, 0.30, 0.32) single crystals was compared. The results showed that the PMN–0.28PT single crystal has an obviously higher phase transition temperature Trt (ferroelectric rhombohedral phase to tetragonal phase transition) than that of other compositions with comparable piezoelectric properties. All these would be highly favourable for practical piezoelectric applications.
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