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Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3Lead-Free Incipient Piezoceramic

Acosta, Matias and Jo, Wook and Rödel, Jürgen and Lupascu, Doru C. (2014):
Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3Lead-Free Incipient Piezoceramic.
In: Journal of the American Ceramic Society, pp. 1937-1943, 97, (6), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.12884],
[Article]

Abstract

The dielectric and electromechanical properties of 0.75Bi1/2Na1/2TiO3–0.25 SrTiO3 (25ST) as a function of temperature and frequency were studied. It is shown that the 25ST is a relaxor ferroelectric as evidenced by the temperature-dependent dielectric relaxations with an incipient piezoelectricity featured by the presence of a reversible electric-field-induced phase transformation at room temperature. The transition occurs on a broad electric field strength range depending on field amplitude and frequency. It is also accompanied by a huge strain that is attributed to repetitive poling and depoling originating due to the reversibility of the phase transition. The 25ST makes an attractive lead-free candidate for stack actuators as it presents a high normalized d33* of ~600 pm/V at a low electric field of 4 kV/mm for frequencies ranging from 0.1 up to 100 Hz.

Item Type: Article
Erschienen: 2014
Creators: Acosta, Matias and Jo, Wook and Rödel, Jürgen and Lupascu, Doru C.
Title: Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3Lead-Free Incipient Piezoceramic
Language: English
Abstract:

The dielectric and electromechanical properties of 0.75Bi1/2Na1/2TiO3–0.25 SrTiO3 (25ST) as a function of temperature and frequency were studied. It is shown that the 25ST is a relaxor ferroelectric as evidenced by the temperature-dependent dielectric relaxations with an incipient piezoelectricity featured by the presence of a reversible electric-field-induced phase transformation at room temperature. The transition occurs on a broad electric field strength range depending on field amplitude and frequency. It is also accompanied by a huge strain that is attributed to repetitive poling and depoling originating due to the reversibility of the phase transition. The 25ST makes an attractive lead-free candidate for stack actuators as it presents a high normalized d33* of ~600 pm/V at a low electric field of 4 kV/mm for frequencies ranging from 0.1 up to 100 Hz.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 6
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: 24 Jun 2014 08:49
Official URL: http://dx.doi.org/10.1111/jace.12884
Identification Number: doi:10.1111/jace.12884
Funders: This work was financially supported by the state center AdRIA on adaptronics.
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