Modification of microstructure and electrical properties in (K,Na)NbO3-(Ba,Ca)ZrO3 ceramics by changing K/Na ratio

作者：Mei, Ting; Chen, Tao^*; Liu, Yuhong; Zhang, Jianwei; Zhang, Ting; Wang, Guangchang; Zhou, Jifang

来源：Ferroelectrics, 2017, 506(1): 159-164.

DOI：10.1080/00150193.2017.1282748

• (K
• Na)NbO3
• lead-free ceramics
• piezoelectric properties
• physical mechanism

0.94(KxNa1-x)NbO3-0.06Ba(0.8)Ca(0.2)ZrO(3) lead-free ceramics were prepared by the conventional solid-state method, and the effects of K/Na ratio on their piezoelectric properties were investigated in detail. Their grain sizes gradually decrease as the K/Na contents reach 60/40. By optimizing the K/Na ratio, an optimum piezoelectric behavior of d(33)approximate to 270 pC/N and k(p)approximate to 45% can be observed in the ceramics with x = 0.48. In addition, its piezoelectric activity was also strongly sensitive to the sintering temperatures and poling conditions, that is, d(33) increases from 120 pC/N to 270 pC/N by a sintering temperature of 1160 degrees C and an optimum poling condition of >120 degrees C and 3 kV/mm. As a result, the modification of K/Na ratio is an effective way to further improve piezoelectric properties of KNN ceramics.

• 出版日期2017
• 单位成都医学院