Abstract
0.95Na0.5Bi0.5TiO3–0.05K0.5Bi0.5TiO3 lead-free piezoelectric single crystal with rhombohedral structure was grown by the top-seeded solution growth method. The temperature dependence of dielectric constant and loss, polarization hysteresis loops, the optimum poling condition and the electromechanical coupling property were investigated for the 〈100〉-oriented as-grown crystal. The curves ε(T) show two anomalies, which are related to the two phase transformations at the temperature range of 130–340°C. The piezoelectric constant d33 and electromechanical coupling coefficient kt for the 〈001〉-oriented crystal at room temperature reached 147pC/N and 0.52, respectively. The value of kt demonstrated a relatively stable thermal electromechanical coupling property over the temperature range of 15–130°C.
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