Abstract
In this study, Li0.02(Na0.55K0.45)0.98[(Nb0.77Ta0.18Sb0.05)1−2x/5Cux]O3 (LNKNTS-x Cu) piezoelectric ceramics with x=0–0.015 were fabricated by conventional solid-state reaction method. The temperature stability of kp was investigated. At the sintering temperature of 1120°C and 0.6mol% Cu content, the optimum values of density=4.808g/cm3, kp=0.446, Qm=109, εr=1359 and d33=254pC/N, were obtained, respectively. Taking into consideration above physical properties, it is considered that this composition is applicable to lead-free haptic piezoelectric actuators with good temperature stability in the temperature range of −20 to 80°C.
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