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Relationship between electromechanical properties and phase diagram in the Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 lead-free piezoceramic

Acosta, Matias and Novak, Nikola and Jo, Wook and Rödel, Jürgen (2014):
Relationship between electromechanical properties and phase diagram in the Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 lead-free piezoceramic.
In: Acta Materialia, pp. 48-55, 80, ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2014.07.058],
[Article]

Abstract

The Ba(Zr0.2Ti0.8)O3–x (Ba0.7Ca0.3)TiO3 system was synthesized in a wide compositional range in order to study the relationship between its phase diagram and electromechanical properties. Phase transitions were marked using peaks in temperature-dependent permittivity, providing up to three transitions from the rhombohedral phase to an orthorhombic, tetragonal and finally cubic phase, which meet in a region that is termed the phase convergence region in this work. In situ small and large signal electromechanical properties were studied as a function of temperature with specific emphasis on these transitions. A small signal piezoelectric coefficient, d 33, presents maximized values at the transition from the orthorhombic to the tetragonal phase, while a large signal piezoelectric coefficient, View the MathML sourced33∗, does so at both rhombohedral to orthorhombic and to tetragonal phase transitions. Maximum polarization Pmax was the only quantity determined that had a clear maximum at the phase convergence region.

Item Type: Article
Erschienen: 2014
Creators: Acosta, Matias and Novak, Nikola and Jo, Wook and Rödel, Jürgen
Title: Relationship between electromechanical properties and phase diagram in the Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 lead-free piezoceramic
Language: English
Abstract:

The Ba(Zr0.2Ti0.8)O3–x (Ba0.7Ca0.3)TiO3 system was synthesized in a wide compositional range in order to study the relationship between its phase diagram and electromechanical properties. Phase transitions were marked using peaks in temperature-dependent permittivity, providing up to three transitions from the rhombohedral phase to an orthorhombic, tetragonal and finally cubic phase, which meet in a region that is termed the phase convergence region in this work. In situ small and large signal electromechanical properties were studied as a function of temperature with specific emphasis on these transitions. A small signal piezoelectric coefficient, d 33, presents maximized values at the transition from the orthorhombic to the tetragonal phase, while a large signal piezoelectric coefficient, View the MathML sourced33∗, does so at both rhombohedral to orthorhombic and to tetragonal phase transitions. Maximum polarization Pmax was the only quantity determined that had a clear maximum at the phase convergence region.

Journal or Publication Title: Acta Materialia
Volume: 80
Uncontrolled Keywords: Electroceramic; Perovskites; Ferroelectric; Piezoelectric; Lead-free piezoceramics
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: 26 Aug 2014 07:39
Official URL: http://dx.doi.org/10.1016/j.actamat.2014.07.058
Identification Number: doi:10.1016/j.actamat.2014.07.058
Funders: This work was supported by the AdRIA Hesse state center for Adaptronics.
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