Improved piezoelectricity and high strain response of (1 − x)(0.948K0.5Na0.5NbO3 − 0.052LiSbO3) − xBi2O3
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- 作者：Yan Zhao ; Zhijun Xu ; Ruiqing Chu ; Jigong Hao…
- 刊名：Journal of Materials Science: Materials in Electronics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：28
- 期：2
- 页码：1211-1216
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1573-482X
- 卷排序：28
文摘
(1 − x)(0.948K0.5Na0.5NbO3 − 0.052LiSbO3) − xBi2O3 (x = 0.001 ~ 0.004) (abbreviated as KNN − 5.2LS − xBi) lead-free piezoelectric ceramics were prepared using conventional solid sintering method and the effect of bismuth oxide (Bi2O3)-doping on phase structure, microstructure and electric properties were investigated. It was found that Bi2O3-doping induces a phase transition from the tetragonal phases to a pseudocubic phase with a normal-relaxor ferroelectric transformation, and acts as grain growth inhibitor, which significantly decreases the grain size of the ceramics. The KNN − 5.2LS ceramic with 0.2 mol. % Bi2O3 exhibited the optimum electrical properties (d33 = 229 pC/N, kp = 31.08 %), together with a low TO–T of 77 °C. In addition, the highest TC (∼355 °C), the highest Smax (∼0.20 %) and d33* (∼392 pm/V) values can be attained in the ceramics with x = 0.001, which is superior to those of the previously reported KNN-based ceramics. These results show that the KNN − 5.2LS − xBi ceramic is one of the most promising candidates for replacing PZT-based ceramics.
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