Abstract
The MTiO3 (M = Ca, Sr, Ba, Bi0.5Na0.5, Bi0.5K0.5 and Bi0.5Li0.5)-modified (K0.5Na0.5)0.94Li0.06NbO3 lead-free piezoelectric ceramics were prepared using normal sintering for improving the temperature stability and fatigue resistance of (K0.5Na0.5)NbO3-based ceramics. Results showed that MTiO3 substitution into (K0.5Na0.5)0.94Li0.06NbO3 shifts the polymorphic phase transition below room temperature. The dominant crystal phase changes from coexistence of orthorhombic and tetragonal phase to tetragonal phase with the MTiO3 addtion. Accordingly, the temperature stability and fatigue resistance of the modified ceramics were significantly improved. It was found that 1.0 mol% MTiO3 (M = Ca)-modified (K0.5Na0.5)0.94Li0.06NbO3 ceramics exhibited nearly temperature-independent properties (25–160 °C), fatigue-free behavior (up to 105 cycles) and good piezoelectric properties (d *33 = 245 pm/V), indicating these materials promising for actuator and transducers applications.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 51402144, 51372110, 51302124), the Project of Shandong Province Higher Educational Science and Technology Program (Grant Nos. J14LA11 and J14LA10), the National High Technology Research and Development Program of China (No. 2013AA030801), Science and Technology Planning Project of Guangdong Province, China (No. 2013B091000001), Independent innovation and achievement transformation in Shandong Province special, China (No. 2014CGZH0904), the Natural Science Foundation of Shandong Province of China (Grant No. ZR2014JL030), and the Research Foundation of Liaocheng University (Nos. 318051407, 318011301, 318011306).
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Hao, J., Xu, Z., Chu, R. et al. Enhanced thermal stability and fatigue resistance in MTiO3-modified (K0.5Na0.5)0.94Li0.06NbO3 lead-free piezoelectric ceramics. J Mater Sci: Mater Electron 26, 7867–7872 (2015). https://doi.org/10.1007/s10854-015-3437-x
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DOI: https://doi.org/10.1007/s10854-015-3437-x