Relative shrinkage and activation energy of (1-x)(Na,K) NbO3-x(Bi,Na)TiO3 depending on sintering temperature

초록

Even though (Na0.5K0.5)NbO3 (NKN) and (Bi0.5Na0.5)TiO3 (BNT) piezoelectric materials are both representative of the lead-free piezoelectric ceramics, stoichiometric preparation and sintering temperature are especially important for the (Na0.5K0.5)NbO3-based ceramics owing to sensitivity of the (Na0.5K0.5)NbO3 (NKN) to non-stoichiometry and a low reproducibility of the (Bi0.5Na0.5)TiO3 (BNT). In this work, (1 - x)(Na0.5K0.5)NbO3-x(Bi0.5Na0.5)TiO3 ceramics were prepared by varying the sintering temperature in order to improve its characteristics by complementing each other. The effects of the sintering temperature on the microstructure, and dielectric property were systematically investigated. In addition, the relative shrinkage and the activation energy of the (1 - x)(Na0.5K0.5)NbO3-x(Bi0.5Na0.5)TiO3 ceramics were analyzed at various temperatures ranging from 1080 to 1160 degrees C. The optimized sintering temperatures are expected to improve the dielectric and piezoelectric properties of (1 - x)(Na0.5K0.5)NbO3-x(Bi0.5Na0.5)TiO3 ceramics. (C) 2015 Elsevier B.V. All rights reserved.

키워드