| Affiliation: | 1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China;3. National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, College of Engineering and Applied Science and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, P. R. China;4. Department of Physics, Southern University of Science and Technology, Shenzhen, P. R. China;5. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China |
| Abstract: | Temperature scaling of dynamic ferroelectric hysteresis for the morphotropic phase boundary (MPB) compositions in xBiScO3–(1-x-y)PbZrO3–yPbTiO3 (xBS–(1-x-y)PZ–yPT, 0.018 ≤ x ≤ 0.264) ternary system was systematically investigated. The power-law relation was obtained for remanent polarization Pr and temperature T, that is, Pr ∝ Tβ. It is interesting to find that the power-law exponent β could be modulated by BiScO3 content x. With the increase of x from 0.018 to 0.264, β varies from ?1.09398 to 2.44147. Transition of β from negative to positive produces in the vicinity of 0.054BS–0.476PZ–0.470PT ceramic. At this composition, the magnitude of β is very close to zero with value of only ?0.01567, implying an almost temperature-independent polarization characteristic of the ceramic. Comparing with the conventional PZT-based piezoelectric ceramics that usually with negative exponent β, when x > 0.054, the xBS–(1-x-y)PZ–yPT ceramics show positive β value, so that the ferroelectric polarization is enhanced with increasing temperature. Such a positive temperature dependence of ferro-/piezoelectric property makes the ternary system a promising candidate for high-temperature applications. |
