Effect of SrTiO3 template on electric properties of textured BNT-BKT ceramics prepared by templated grain growth process

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.