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Giant electromechanical strain response in lead-free SrTiO3-doped (Bi0.5Na0.5TiO3-BaTiO3)-LiNbO3 piezoelectric ceramics.
- Source :
- Journal of the American Ceramic Society; Oct2017, Vol. 100 Issue 10, p4670-4679, 10p
- Publication Year :
- 2017
-
Abstract
- Lead-free 0.985[(0.94− x)Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>TiO<subscript>3</subscript>-0.06BaTiO<subscript>3</subscript>- xSrTiO<subscript>3</subscript>]-0.015LiNbO<subscript>3</subscript> [( BNT- BT- xST)- LN, x=0-0.05] piezoelectric ceramics were prepared using a conventional solid-state reaction method. It was found that the long-range ferroelectric order in the unmodified ( BNT- BT)- LN ceramic was disrupted and transformed into the ergodic relaxor phase with the ST substitution, which was well demonstrated by the dramatic decrease in remnant polarization ( P<subscript>r</subscript>), coercive field ( E<subscript>c</subscript>), negative strain ( S<subscript>neg</subscript>) and piezoelectric coefficient ( d<subscript>33</subscript>). However, the degradation of the ferroelectric and piezoelectric properties was accompanied by a significant increase in the usable strain response. The critical composition ( BNT- BT-0.03 ST)- LN exhibited a maximum unipolar strain of ~0.44% and corresponding normalized strain, S<subscript>max</subscript>/ E<subscript>max</subscript> of ~880 pm/V under a moderate field of 50 kV/cm at room temperature. This giant strain was associated with the coexistence of the ferroelectric and ergodic relaxor phases, which should be mainly attributed to the reversible electric-field-induced transition between the ergodic relaxor and ferroelectric phases. Furthermore, the large field-induced strain showed relatively good temperature stability; the S<subscript>max</subscript>/ E<subscript>max</subscript> was as high as ~490 pm/V even at 120°C. These findings indicated that the ( BNT- BT- xST)- LN system would be a suitable environmental-friendly candidate for actuator applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 100
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 125257563
- Full Text :
- https://doi.org/10.1111/jace.15009