Enhanced Electromechanical Properties and Temperature Stability of Textured (K0.5Na0.5)NbO3-Based Piezoelectric Ceramics

Authors

  • Yunfei Chang,

    Corresponding author
    1. School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, Shaanxi, China
    2. Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
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  • Stephen Poterala,

    1. Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
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  • Zupei Yang,

    1. School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, Shaanxi, China
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  • Gary L. Messing

    1. Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
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  • D. Damjanovic—contributing editor

†Author to whom correspondence should be addressed. e-mail: yuc15@psu.edu

Abstract

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 (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, d33*=208 pC/N) and higher phase transition temperatures (Tot=155°C, Tc=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 Tot=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 Tot near room temperature.

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