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Author

Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 Lead-Free Incipient Piezoceramic

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Title
Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 Lead-Free Incipient Piezoceramic
Author
Acosta, MatiasJo, WookRoedel, Juergen
Keywords
FREE PIEZOELECTRIC CERAMICS; FERROELECTRIC CERAMICS; DIELECTRIC-PROPERTIES; STRAIN; (NA1/2BI1/2)TIO3; PERSPECTIVE; TRANSITION; ACTUATORS
Issue Date
201406
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.97, no.6, pp.1937 - 1943
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 similar to 600pm/V at a low electric field of 4kV/mm for frequencies ranging from 0.1 up to 100Hz.
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DOI
http://dx.doi.org/10.1111/jace.12884
ISSN
0002-7820
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