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Enhanced Electromechanical Properties and Temperature Stability of Textured (K

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In this work, we report the electromechanical properties of 〈00lC‐textured (K0.5Na0.5)0.98Li0.02NbO3 (KNLN) and (K0.5Na0.5)(Nb0.85Ta0.15)O3 (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 ot =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 〈00lC textured and poled orthorhombic KNLN may exhibit domain engineering character. The piezoelectric performance of textured KNLN with T ot =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 ot near room temperature.
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Document Type: Research Article

Affiliations: 1: Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802 2: School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, Shaanxi, China

Publication date: August 1, 2011

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