Document Type
Article
Publication Date
2013
Journal or Book Title
Advanced Functional Materials
Volume
23
Issue
42
First Page
5261
Last Page
5266
DOI
10.1002/adfm.201300640
Abstract
A new phase boundary is revealed in (1-x)(Bi1/2Na1/2)TiO3xBaTiO3, the most extensively studied lead-free piezoelectric solid solution. This discovery results from a novel method of electron diffraction analysis, which allows for the precise determination of oxygen octahedra tilting in multi-domain perovskite ferroelectrics. The study using this method supports the recently proposed Cc symmetry for pure (Bi1/2Na1/2)TiO3, and, more importantly, indicates the crystal structure evolves into the R3c symmetry with the addition of BaTiO3, forming a Cc/R3c phase boundary at x = 3~4%. In the poling field Epol vs. composition x phase diagram for polycrystalline ceramics, this phase boundary exists with Epol below 5.5 kV/mm; the Cc phase is transformed to the R3c phase during poling at higher fields. The results reported here provide the microstructural origin for the previously unexplained strain behavior and clarify the low-BaTiO3-content phase relationship in this popular lead-free piezoelectric system.
Copyright Owner
Ma, et al.
Copyright Date
2013
Language
en
File Format
application/pdf
Recommended Citation
Ma, Cheng; Guo, Hanzheng; and Tan, Xiaoli, "A New Phase Boundary in (Bi1/2Na1/2)TiO3BaTiO3 Revealed via a Novel Method of Electron Diffraction Analysis" (2013). Materials Science and Engineering Publications. 181.
https://lib.dr.iastate.edu/mse_pubs/181
Comments
This is the accepted version of the following article: Advanced Functional Materials 23, 5261-5266 (2013). DOI: 10.1002/ adfm.201300640, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adfm.201300640/full.