1. Large flexoelectric response in PMN-PT ceramics through composition design.
- Author
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Li, Chunchun, Wang, Zhiguo, Li, Fei, Rao, Zhenggang, Huang, Wenbin, Shen, Zhenjiang, Ke, Shanming, and Shu, Longlong
- Subjects
FERROELECTRIC ceramics ,RELAXOR ferroelectrics ,FLEXOELECTRICITY ,PIEZOELECTRICITY ,CERAMICS ,FERROELECTRIC crystals ,DIELECTRICS - Abstract
Flexoelectricity yields electric polarization through graded strains and exists in various kinds of solid dielectrics but usually with a weak coupling response. In this letter, several Bi-doped Pb(Mg
2/3 Nb1/3 )O3 -xPbTiO3 (PMN-xPT) ferroelectric ceramics were prepared and the interplay of their piezoelectricity and flexoelectricity was systematically investigated. The largest flexoelectric response (∼300 μC/m) was 30 times larger than that of pure PMN-PT and was observed in the Bi-doped PMN-32PT, where the after poling piezoelectric coefficients were also the largest (990 pC/N) among all the compositions. This suggests that the apparent flexoelectricity in ferroelectrics is highly related to the bulk piezoelectricity. Therefore, introducing a local structural heterogeneity is considered as a feasible approach to achieve an ultrahigh piezoelectric response while also providing an ultrahigh flexoelectricity. [ABSTRACT FROM AUTHOR]- Published
- 2019
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