A new method to improve the electrical properties of KNN-based ceramics: Tailoring phase fraction

作者：Lv, Xiang; Wu, Jiagang^*; Zhu, Jianguo; Xiao, Dingquan; Zhangb, Xixiang^*

来源：Journal of the European Ceramic Society, 2018, 38(1): 85-94.

DOI：10.1016/j.jeurceramsoc.2017.08.016

• Lead-free piezoceramics
• Multiphase coexistence
• Phase fraction
• Electrical properties

Although both the phase type and fraction of multi-phase coexistence can affect the electrical properties of (K,Na)NbO3 (KNN)-based ceramics, effects of phase fraction on their electrical properties were few concerned. In this work, through changing the calcination temperature of CaZrO3 powders, we successfully developed the 0.96 K0.5Na0.5Nb0.96Sb0.04O3-0.01CaZrPO(3)-0.03Bi(0.5)Na(0.5)HfO(3) ceramics containing a wide rhombohedral-tetragonal (R-T) phase coexistence with the variations of T (or R) phase fractions. It was found that higher T phase fraction can warrant a larger piezoelectric constant (d(33)) and d(33) also showed a linear variation with respect to tetragonality ratio (c/a). More importantly, a number of domain patterns were observed due to high T phase fraction and large c/a ratio, greatly benefiting the piezoelectricity. In addition, the improved ferroelectric fatigue behavior and thermal stability were also shown in the ceramics containing high T phase fraction. Therefore, this work can bring a new viewpoint into the physical mechanism of KNN-based ceramics behind R-T phase coexistence.

• 出版日期2018-1
• 单位KAUST; 四川大学