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Title: Morphotropic phase boundary and electrical properties in (1-x) Bi₀.₅Na₀.₅TiO₃-xBi(Zn₀.₅Ti₀.₅)O₃lead-free piezoceramics
Authors: Zhang, S
Yan, F 
Yang, B
Issue Date: 1-Jun-2010
Source: Journal of applied physics, 1 June 2010, v. 107, no. 11, 114110, p. 1-4
Abstract: (1−x)Bi₀.₅Na₀.₅TiO₃-xBi(Zn₀.₅Ti₀.₅)O₃[(1−x)BNT−xBZT, x=0, 0.025, 0.0375, 0.050, and 0.075] lead-free piezoceramics were prepared and their structures and electrical properties were investigated. It is found that BZT can increase the Curie temperature of BNT. A morphotropic phase boundary (MPB) separating rhombohedral and tetragonal phases exists near x=0.0375. As the result, the MPB composition shows improved electrical properties; the saturated polarization, remnant polarization, and coercive field are 42.0 μC/cm², 36.5 μC/cm², and 3.5 kV/mm, respectively, while the piezoelectric coefficient, planar electromechanical coupling factor, and unipolar strain are 92 pC/N, 0.22, and 0.08%, respectively. The structures and electrical properties are discussed by comparing with that of other BNT-based piezoceramics. Our results do not only supplement for BNT-based lead-free piezoceramics, but also may provide a way to develop new lead-free piezoceramics with high Curie temperature.
Keywords: Bismuth compounds
Coercive force
Curie temperature
Ferroelectric ceramics
Piezoceramics
Remanence
Sodium compounds
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.3431387
Rights: © 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S.T. Zhang, F. Yan & B. Yang, J. Appl. Phys. 107, 114110 (2010) and may be found at http://link.aip.org/link/?jap/107/114110
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