Publication Date:
2011-03-25
Description:
In this work, we report the electromechanical properties of 〈00 l 〉 C -textured (K 0.5 Na 0.5 ) 0.98 Li 0.02 NbO 3 (KNLN) and (K 0.5 Na 0.5 )(Nb 0.85 Ta 0.15 )O 3 (KNNT) ceramics produced by templated grain growth. Both materials show high texture quality ( F 00l =98% and full-width at half-maximum [FWHM]=8.4° for KNLN, F 00l =99%, and FWHM=7.6° for KNNT) and enhanced piezoelectric response compared with randomly oriented ceramics. However, textured KNLN shows higher piezoelectric properties ( d 33 =192 pC/N, k p =0.63, k 31 =0.39, d 31 =−73 pC/N, d 33 * =208 pC/N) and higher phase transition temperatures ( T o − t =155°C, T c =439°C) than textured KNNT. The enhanced room-temperature piezoelectric properties are associated with low-strain hysteresis (4.0%), suggesting that 〈00 l 〉 C textured and poled orthorhombic KNLN may exhibit domain engineering character. The piezoelectric performance of textured KNLN with T o − t =155°C is high and stable over a wide temperature range (−60°–100°C), strongly favoring use of this material in device applications compared with the modified KNN-based materials with a T o − t near room temperature.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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