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Evolving morphotropic phase boundary in lead-free (Bi[sub 1/2]Na[sub 1/2])TiO[sub 3]–BaTiO[sub 3] piezoceramics

Jo, Wook and Daniels, John E. and Jones, Jacob L. and Tan, Xiaoli and Thomas, Pamela A. and Damjanovic, Dragan and Rödel, Jürgen (2011):
Evolving morphotropic phase boundary in lead-free (Bi[sub 1/2]Na[sub 1/2])TiO[sub 3]–BaTiO[sub 3] piezoceramics.
In: Journal of Applied Physics, pp. 014110-1-014110-7, 109, (1), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.3530737],
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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.

Item Type: Article
Erschienen: 2011
Creators: Jo, Wook and Daniels, John E. and Jones, Jacob L. and Tan, Xiaoli and Thomas, Pamela A. and Damjanovic, Dragan and Rödel, Jürgen
Title: Evolving morphotropic phase boundary in lead-free (Bi[sub 1/2]Na[sub 1/2])TiO[sub 3]–BaTiO[sub 3] piezoceramics
Language: English
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.

Journal or Publication Title: Journal of Applied Physics
Volume: 109
Number: 1
Uncontrolled Keywords: barium compounds, ferroelectric ceramics, ferroelectric transitions, mixtures, permittivity, piezoceramics, sodium compounds, space groups, texture
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Jun 2011 08:14
Official URL: http://dx.doi.org/10.1063/1.3530737
Identification Number: doi:10.1063/1.3530737
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