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Correlation Between Piezoelectric Properties and Phase Coexistence in (Ba,Ca)(Ti,Zr)O3Ceramics

Zhang, Yichi and Glaum, Julia and Groh, Claudia and Ehmke, Matthias C. and Blendell, John E. and Bowman, Keith J. and Hoffman, Mark J. and Trolier-McKins, S. (2014):
Correlation Between Piezoelectric Properties and Phase Coexistence in (Ba,Ca)(Ti,Zr)O3Ceramics.
In: Journal of the American Ceramic Society, pp. 2885-2891, 97, (9), ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/jace.13047],
[Article]

Abstract

High piezoelectric properties are desired for lead-free piezoelectric materials in consideration as a replacement for lead-based materials in applications. Due to the high piezoelectric coefficient, (Ba100-xCax) (Ti100-yZry) O-3 (BCTZ) piezoelectric ceramics have been considered as a promising lead-free alternate piezoelectric material. Here, six compositions were selected based on a prediction that all the compositions would have high piezoelectric coefficient at room temperature. The results confirmed all compositions exhibit well developed hysteresis loops and a large piezoelectric coefficient at room temperature. This is due to the coexistence of several phases where the major phase is likely to be orthorhombic and the second phase is proposed to be tetragonal. The phase transition was found to occur over a broad temperature range instead of at a specific temperature only. A relationship between the tetragonal-orthorhombic phase transition temperature and Ca2+ and Zr4+ content was proposed. This enables clear determination of BCTZ compositions with high piezoelectric coefficient at a desired operation temperature.

Item Type: Article
Erschienen: 2014
Creators: Zhang, Yichi and Glaum, Julia and Groh, Claudia and Ehmke, Matthias C. and Blendell, John E. and Bowman, Keith J. and Hoffman, Mark J. and Trolier-McKins, S.
Title: Correlation Between Piezoelectric Properties and Phase Coexistence in (Ba,Ca)(Ti,Zr)O3Ceramics
Language: English
Abstract:

High piezoelectric properties are desired for lead-free piezoelectric materials in consideration as a replacement for lead-based materials in applications. Due to the high piezoelectric coefficient, (Ba100-xCax) (Ti100-yZry) O-3 (BCTZ) piezoelectric ceramics have been considered as a promising lead-free alternate piezoelectric material. Here, six compositions were selected based on a prediction that all the compositions would have high piezoelectric coefficient at room temperature. The results confirmed all compositions exhibit well developed hysteresis loops and a large piezoelectric coefficient at room temperature. This is due to the coexistence of several phases where the major phase is likely to be orthorhombic and the second phase is proposed to be tetragonal. The phase transition was found to occur over a broad temperature range instead of at a specific temperature only. A relationship between the tetragonal-orthorhombic phase transition temperature and Ca2+ and Zr4+ content was proposed. This enables clear determination of BCTZ compositions with high piezoelectric coefficient at a desired operation temperature.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 9
Uncontrolled Keywords: LEAD-FREE CERAMICS; DIELECTRIC-PROPERTIES; D(33) COEFFICIENT; TEMPERATURE; TITANATE; SYSTEM
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: 06 Jan 2015 10:45
Official URL: http://dx.doi.org/10.1111/jace.13047
Identification Number: doi:10.1111/jace.13047
Funders: This work is supported by Australian Research Council grant DP0988182. JG acknowledges support from the Australian Research Council under grant no. DE120102644.
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