Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 603, Issue -, Pages 149-157Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.03.033
Keywords
Templated grain growth; (Bi0.5Na0.5)TiO3 ceramics; Electrostriction; Lead-free ceramics
Categories
Funding
- Shanghai Municipal Natural Science Foundation [12ZR1434600]
- National Natural Science Foundation of China [51372171, 51332003]
- Research Committee of the University of Macau under Research & Development Grant for Chair Professor
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In this work, < 00 > textured lead-free piezoelectric (1-x)(0.83 Bi0.5Na0.5TiO3-0.17Bi(0.5)K(0.5)TiO(3))-xSrTiO(3) (BNT-BKT-xST) ceramics were fabricated by template grain growth in combination with tape casting using plate-like SrTiO3 as a template. The effect of ST template on the grain orientation, strain behavior, dielectric, ferroelectric, pyroelectric and piezoelectric properties was systematically investigated in order to search the lead-free piezoelectric materials with an excellent actuating performance. The templated growth of < 00 > oriented grains on the ST template resulted in textured ceramics with brick wall microstructures and significantly high < 00 > texture degree corresponding to >90% Lotgering factor at 9-15 mol% ST template. Textured ceramics showed excellent strain properties as compared to the random counterparts and encouraging results of large strain of 0.38% with normalized strain S-max/E-max = 626 pm/V for the textured critical composition with 15 mol% ST template were obtained at room temperature. Furthermore, the textured ceramics with 27 mol% ST template exhibited large electrostrictive coefficient Q(11) of 0.023 m(4) C (2) and superior temperature stability compared to the random counterparts, which are very promising and makes them tremendous potential for the environmental-friendly solid-state actuator applications. (C) 2014 Elsevier B. V. All rights reserved.
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