Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3- 0.04LiSbO3 lead-free piezoelectric ceramics |
| |
Authors: | Zhao Jing-Bo Du Hong-Liang Qu Shao-Bo Zhang Hong-Mei Xu Zhuo |
| |
Affiliation: | The College of Science, Air Force Engineering University, Xián 710051, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;Electronic Materials Research Laboratory (Key Laboratory of the Ministry of Education),Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;Electronic Materials Research Laboratory (Key Laboratory of the Ministry of Educatio14), Xián Jiaotong University, Xián 710049, China |
| |
Abstract: | Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5 + xNa0.5 + xNbO3-0.04LiSbO3 lead-free piezoelectric ceramics were examined for 0 ≤ x ≤ 0.02. The piezoelectric coefficients exhibited a maximum, d33= 187 pC/N at x=0.0075, coinciding with the maximum of the grain size and the apparent density at x=0.0075. The apparent density and the piezoelectric coefficients decreased with increasing x at higher x which was likely due to the crystal geometrical distortion of 0.96K0.5 + xNa0.5 + xNbO3-0.04LiSbO3. In addition, super-large grains were found and this may be due to liquid phase sintering. Excess (K++Na+) attracted a sum of space charges to keep the charge neutral, resulting in charge leakage during the course of ceramic polarization, influencing the piezoelectric and ferroelectric properties. These findings are of importance for guiding the design of K0.5Na0.5NbO3-based lead-free ceramics with enhanced electrical properties. |
| |
Keywords: | lead-free ceramics piezoelectric non-stoichiometry K0.5Na0.5NbO3 |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|