Evolving morphotropic phase boundary in lead-free (Bi1/2Na1/2)TiO3–BaTiO3 piezoceramics

Date
2011-01-07
Authors
Jo, Wook
Daniels, John
Tan, Xiaoli
Jones, Jacob
Tan, Xiaoli
Thomas, Pamela
Damjanovic, Dragan
Rödel, Jürgen
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Tan, Xiaoli
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Materials Science and Engineering
Abstract

The correlation between structure and electrical properties of lead-free (1−x)(Bi1/2Na1/2)TiO3–xBaTiO3 (BNT-100xBT) polycrystalline piezoceramics was investigated systematically by in situ synchrotron diffraction technique, combined with electrical property characterization. It was found that the morphotropic phase boundary (MPB) between a rhombohedral and a tetragonal phase evolved into a morphotropic phase region with electric field. In the unpoled material, the MPB was positioned at the transition from space group R3m to P4mm (BNT-11BT) with optimized permittivity throughout a broad single-phase R3m composition regime. Upon poling, a range of compositions from BNT-6BT to BNT-11BT became two-phase mixture, and maximum piezoelectric coefficient was observed in BNT-7BT. It was shown that optimized electrical properties are related primarily to the capacity for domain texturing and not to phase coexistence.

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The following article appeared in Journal of Applied Physics 109 (2011): 014110 and may be found at http://dx.doi.org/10.1063/1.3530737.

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