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- Title
Giant Piezoelectricity of Ternary Perovskite Ceramics at High Temperatures.
- Authors
Zhao, Tian‐Long; Bokov, Alexei A.; Wu, Jingen; Wang, Hongli; Wang, Chun‐Ming; Yu, Yang; Wang, Chun‐Lei; Zeng, Kaiyang; Ye, Zuo‐Guang; Dong, Shuxiang
- Abstract
Here, novel ferroelectric ceramics of (0.95 − x)BiScO3‐xPbTiO3‐0.05Pb(Sn1/3Nb2/3)O3 (BS‐xPT‐PSN) of complex perovskite structure are reported with compositions near the morphotropic phase boundary (MPB), and which exhibit a piezoelectric coefficient d33 = 555 pC N−1, a large‐signal coefficient d33∗ ≈ 1200 pm V−1 at room temperature, and a high Curie temperature TC of 408 °C. More interestingly, this ternary system exhibits a giant and stable piezoelectric response at 200 °C with a large‐signal d33∗ ≈ 2500 pm V−1, matching that of the costly relaxor‐based piezoelectric single crystals at room temperature. The mechanisms of such giant piezoelectricity and its characteristic temperature dependence are attributed to the spontaneous polarization rotation and extension under an electric field and the MPB‐related phase transition. The findings reveal that the BS‐xPT‐PSN ceramics constitute a new family of high‐performance piezoelectric materials suitable for electromechanical transducers that can be operated at high temperatures (at 200 °C, or higher). Ferroelectric ceramics of (0.95 − x)BiScO3‐xPbTiO3‐0.05Pb(Sn1/3Nb2/3)O3 exhibit a giant and stable piezoelectric response at 200 °C with a large‐signal d33∗ ≈ 2500 pm V−1, which is comparable to piezoelectric single crystals. Relevant physical mechanisms underlying the temperature‐enhanced spontaneous polarization rotation and extension under an electric field is demonstrated by Landau–Ginsburg–Devonshire phenomenological model.
- Subjects
RELAXOR ferroelectrics; LEAD-free ceramics; HIGH temperatures; PIEZOELECTRICITY; CERAMICS; FERROELECTRIC ceramics; PIEZOELECTRIC materials
- Publication
Advanced Functional Materials, 2019, Vol 29, Issue 12, pN.PAG
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201807920