Abstract
In order to develop new piezoelectric crystals with high TC and high performance for high-power and high-temperature applications, the Pb(Fe1/2Nb1/2)O3–Pb(Yb1/2Nb1/2)O3–PbTiO3 [PFN–PYN–PT(10/38/52)] ternary piezo-/ferroelectric single crystals have been grown by the flux method for the first time. The crystal structure has been characterized by means of X-ray diffraction technique, showing a perovskite phase with rhombohedral symmetry at room temperature. The as-grown PFN–PYN–PT crystal possesses a high Curie temperature (TC) of 325 °C and a high rhombohedral-tetragonal phase transition temperature (Trt) of 155 °C. Complete electric characterization has revealed the high performance of the ternary crystals, with a dielectric constant e′ = 1620, a piezoelectric coefficient d33 = 1100 pC N−1, a longitudinal electromechanical coupling factor k33 = 70%, a remnant polarization Pr = 25.8 μC cm−2, a coercive field Ec = 10.3 kV cm−1, and a mechanical quality factor Qm = 110 for (001)-oriented crystals at room temperature. These results show that the PFN–PYN–PT crystals are a promising candidate for uses in electromechanical transducers for high-power and high-temperature applications.
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