Phase Transitional Behavior and Piezoelectric Properties of Lead-Free (Na0.5K0.5)NbO3–(Bi0.5K0.5)TiO3 Ceramics |
| |
| Authors: | Ruzhong Zuo Xusheng Fang Chun Ye Longtu Li |
| |
| Affiliation: | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, China |
| |
| Abstract: | (1? x )(Na0.5K0.5)NbO3–(Bi0.5K0.5)TiO3 solid solution ceramics were successfully fabricated, exhibiting a continuous phase transition with changing x at room temperature from orthorhombic, to tetragonal, to cubic, and finally to tetragonal symmetries. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal ferroelectric phases was found at 2–3 mol% (Bi0.5K0.5)TiO3 (BKT), which brings about enhanced piezoelectric and electromechanical properties of piezoelectric constant d 33=192 pC/N and planar electromechanical coupling coefficient k p=45%. The MPB composition has a Curie temperature of 370°–380°C, comparable with that of the widely used PZT materials. These results demonstrate that this system is a promising lead-free piezoelectric candidate material. |
| |
| Keywords: | |
|
|
