Campus Units
Materials Science and Engineering
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
11-17-2019
Journal or Book Title
Journal of the European Ceramic Society
DOI
10.1016/j.jeurceramsoc.2019.11.046
Abstract
Lead-free (K0.5Na0.5)NbO3-based (KNN) piezoceramics featuring a polymorphic phase boundary (PPB) between the orthorhombic and tetragonal phases at room temperature are reported to possess high piezoelectric properties but with inferior cycling stability, while the ceramics with a single tetragonal phase show improved cycling stability but with lower piezoelectric coefficients. In this work, electric biasing in-situ transmission electron microscopy (TEM) study is conducted on two KNN-based compositions, which are respectively at and off PPB. Our observations reveal the distinctive domain responses in these two ceramics under cyclic fields. The higher domain wall density in the poled KNN at PPB contributes to the high piezoelectric properties. Upon cycling, however, a new microstructure feature, “domain intersection”, is directly observed in this PPB composition. In comparison, the off-PPB KNN ceramic develops large domains during poling, which experience much less extent of disruption during cycling. Our comparative study provides the basis for understanding the relation between phase composition and piezoelectric performance.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Copyright Owner
Elsevier Ltd.
Copyright Date
2019
Language
en
File Format
application/pdf
Recommended Citation
Fan, Zhongming; Zhang, Shujun; and Tan, Xiaoli, "Phase-composition dependent domain responses in (K0.5Na0.5)NbO3-based piezoceramics" (2019). Materials Science and Engineering Publications. 357.
https://lib.dr.iastate.edu/mse_pubs/357
Comments
This is a manuscript of an article published as Fan, Zhongming, Shujun Zhang, and Xiaoli Tan. "Phase-composition dependent domain responses in (K0. 5Na0. 5) NbO3-based piezoceramics." Journal of the European Ceramic Society (2019). DOI: 10.1016/j.jeurceramsoc.2019.11.046. Posted with permission.