Abstract

Abstract High piezoelectric constants (d33) and electromechanical coupling factor (kp) are extremely critical for the usage of potassium-sodium Niobate (KNN)-based piezoceramics. In this work, outstanding d33 and kp (∼570 pC/N and 60%, respectively) were obtained in Al-substituted potassium-sodium Niobate-based lead-free piezoceramics [0.955(K0·5Na0.5)(Nb0·965Sb0.035)O3-0.045(Bi1-xAlx)Na0·5ZrO3, abbreviated as KNNS-BAxNZ]. The mechanism of significantly enhanced piezoelectric properties was addressed here. R-T phase coexistence and unique domain configurations facilitated irreversible non-180° domain motion which played an indispensable role in property enhancement of such ceramics. In conclusion, doping Al is an effective and cost-efficient strategy to realize pronouncedly improved electrical properties of KNN-based ceramics as well as decrease the damage of Bi, and in combination of high Tc (∼280 °C) and low tanδ (∼2.8%), KNNS-BAxNZ ceramics with x = 0.1 are regarded as promising candidates for lead-based piezoceramics in some applications.

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