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

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

Offizielle URL: http://dx.doi.org/10.1111/jace.12884

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Acosta, Matias ; Jo, Wook ; Rödel, Jürgen ; Lupascu, Doru C.
Titel: Temperature- and Frequency-Dependent Properties of the 0.75Bi1/2Na1/2TiO3-0.25SrTiO3Lead-Free Incipient Piezoceramic
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Band: 97
(Heft-)Nummer: 6
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 24 Jun 2014 08:49
Offizielle URL: http://dx.doi.org/10.1111/jace.12884
ID-Nummer: 10.1111/jace.12884
Sponsoren: This work was financially supported by the state center AdRIA on adaptronics.
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