|
|||||
|
|
Electrical properties and temperature stability of SrTiO3-modified (Bi1/2Na1/2)TiO3-BaTiO3-(K1/2Na1/2)NbO3 piezoceramics |
|
| Authors: | Guanhua Song Faqiang Zhang Feng Liu Zhifu Liu Yongxiang Li |
| Affiliation: | 1. CAS Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China Center of Materials Science and Optoelectronics Engineering, The University of Chinese Academy of Sciences, Beijing, China;2. CAS Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;3. School of Engineering, RMIT University, Melbourne, Vic., Australia |
| Abstract: | SrTiO3-modified lead-free piezoelectric ceramics, (0.93-x)Bi0.5Na0.5TiO3-xSrTiO3-0.06BaTiO3-0.01 K0.5Na0.5NbO3 [(BNT-xST)-BT-KNN, x = 0-0.06], were prepared using a conventional solid-state reaction method. The XRD structure analysis and electric properties characteristics revealed the ST-induced phase transformation from the ferroelectric phase to the relaxor phase and their coexistence state. Benefiting from the ST-destructed ferroelectric long-range orders, the high normalized strain value of 600 pm/V was obtained in the (BNT-0.02ST)-BT-KNN ceramic at 5 kV/mm. The ST-generated relaxor phase was found to have a constructive effect on improving the temperature stability and restraining the hysteresis of the electric-field-induced strain. The normalized strain of (BNT-0.06ST)-BT-KNN ceramics could be kept at a high value ~337 pm/V at elevated temperature up to 120°C. |
| Keywords: | Bi0.5Na0.5TiO3 electric-field-induced strain lead-free piezoceramics SrTiO3 temperature stability |