Giant strain with low hysteresis in A-site-deficient (Bi0.5Na0.5)TiO3-based lead-free piezoceramics
| Autor: | Huiqing Fan, Guangzhi Dong, Xiaojie Lou, Tangyuan Li, Xiao Liu, Xiangjian Wang, Xiaoli Tan, Xiaoqin Ke, Jing Shi, Yunzhi Wang, Shaodong Cheng, Shao-Bo Mi |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Polymers and Plastics Field (physics) Condensed matter physics Poling Metals and Alloys Nucleation Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Piezoelectricity Electronic Optical and Magnetic Materials Hysteresis Electric field 0103 physical sciences Ceramics and Composites 0210 nano-technology Local field |
| Zdroj: | Acta Materialia. 128:337-344 |
| ISSN: | 1359-6454 |
| Popis: | We report a giant strain (0.72%) with a low degree of hysteresis (ca. 36.2%) and a giant Smax/Emax ratio (916 pm V−1, Smax and Emax denote the maximum strain and the corresponding electric field, respectively) for lead-free (1−x)(0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3)-xSr0.8Bi0.1□0.1Ti0.8Zr0.2O2.95 piezoceramics with x = 0.06. The giant strain originates from a reversible transition between the ergodic relaxor and ferroelectric states under applied electric fields. A-site vacancies (VA) and oxygen vacancies (VO), deliberately introduced to the system, induce a randomly distributed local polarization field. The local field induces embryonic polarization domains that have a broad distribution of maturity and thus smears the transition between the ferroelectric and relaxor states. This leads to a narrow hysteresis loop. The poling field required for the relaxor-to-ferroelectric transition is reduced significantly, due to the remanent ferroelectric phase at zero field acting as the seed, and the point defects synergistically facilitating the nucleation and growth of the ferroelectric phase. Our work provides a novel route for designing piezoelectric materials with both a giant strain and a narrow hysteresis for practical actuator applications. |
| Databáze: | OpenAIRE |
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