TY - JOUR
T1 - Enhanced electromechanical properties and temperature stability of textured (K0.5Na0.5)NbO3-based piezoelectric ceramics
AU - Chang, Yunfei
AU - Poterala, Stephen
AU - Yang, Zupei
AU - Messing, Gary L.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - In this work, we report the electromechanical properties of 〈00l〉C-textured (K0.5Na0.5) 0.98Li0.02NbO3 (KNLN) and (K 0.5Na0.5)(Nb0.85Ta0.15)O 3 (KNNT) ceramics produced by templated grain growth. Both materials show high texture quality (F00l=98% and full-width at half-maximum [FWHM]=8.4° for KNLN, F00l=99%, and FWHM=7.6° for KNNT) and enhanced piezoelectric response compared with randomly oriented ceramics. However, textured KNLN shows higher piezoelectric properties (d33=192 pC/N, kp=0.63, k31=0.39, d31=-73 pC/N, d 33*=208 pC/N) and higher phase transition temperatures (To-t=155°C, Tc=439°C) than textured KNNT. The enhanced room-temperature piezoelectric properties are associated with low-strain hysteresis (4.0%), suggesting that 〈00l〉C textured and poled orthorhombic KNLN may exhibit domain engineering character. The piezoelectric performance of textured KNLN with To-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 To-t near room temperature.
AB - In this work, we report the electromechanical properties of 〈00l〉C-textured (K0.5Na0.5) 0.98Li0.02NbO3 (KNLN) and (K 0.5Na0.5)(Nb0.85Ta0.15)O 3 (KNNT) ceramics produced by templated grain growth. Both materials show high texture quality (F00l=98% and full-width at half-maximum [FWHM]=8.4° for KNLN, F00l=99%, and FWHM=7.6° for KNNT) and enhanced piezoelectric response compared with randomly oriented ceramics. However, textured KNLN shows higher piezoelectric properties (d33=192 pC/N, kp=0.63, k31=0.39, d31=-73 pC/N, d 33*=208 pC/N) and higher phase transition temperatures (To-t=155°C, Tc=439°C) than textured KNNT. The enhanced room-temperature piezoelectric properties are associated with low-strain hysteresis (4.0%), suggesting that 〈00l〉C textured and poled orthorhombic KNLN may exhibit domain engineering character. The piezoelectric performance of textured KNLN with To-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 To-t near room temperature.
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U2 - 10.1111/j.1551-2916.2011.04393.x
DO - 10.1111/j.1551-2916.2011.04393.x
M3 - Article
AN - SCOPUS:80051549085
VL - 94
SP - 2494
EP - 2498
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 8
ER -