Microstructure and Piezoelectric Properties of (K0.5Na0.5)NbO3–BaTiO3 Lead‐Free Piezoelectric Ceramics Modified by B2O3–CuO

A combined sintering aid mixture of B 2 O 3 and CuO for lead-free piezoelectric ceramics having the composition 0.95K 0 . 5 Na 0 . 5 NbO 3 0.05BaTiO 3 (KNN-BT) is introduced. The effects of the sintering aid mixture of 0.6B 2 O 3 -0.4CuO on the sintering behavior, microstructure, and electrical properties of KNN-BT are investigated. Adding 2 wt% of the sintering aid mixture can effectively broaden the narrow sintering temperature range having a size of 20°C to above 50°C and increase the grain size of samples as well as maintain the high density of samples sintered at a low temperature. The increase in grain size contributes to an improvement in electrical properties. High piezoelectric properties of d 33 = 205 pC/N, k p = 38.0%, Q m = 119, e 33 T /e 0 = 1254, and tan δ = 0.0264 are obtained for a KNN-BT-2wt% (B 2 O 3 -CuO) sample sintered at 1120°C.

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