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)TiO3xBaTiO3, 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.

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.

Copyright Owner

Ma, et al.

Language

en

File Format

application/pdf

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