Abstract
The sintering additive 0.4ZnO-0.6B2O3 (abbreviated as ZnB) was proposed to improve the sintering behavior of (K,Na)NbO3 ceramics. The influence of ZnB on the microstructure and electrical properties of (K,Na)NbO3 ceramics was carefully investigated in detail. Results demonstrated that during the sintering process a liquid phase can form at a relative low temperature, which could favor and accelerate the densification of (K,Na)NbO3 ceramics. Moreover, it was found that (K,Na)NbO3 ceramics with 1.2 wt% ZnB exhibited excellent properties with the piezoelectric constant of d33 = 134 pC/N and planar electromechanical coupling coefficient of kp = 40%. Moreover, the field induced strain of 0.135@5 kV/mm was also achieved with this composition. Meanwhile, the mechanism for this enhancement of property was discussed.
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