Electromechanical properties of CaZrO3 modified (K,Na)NbO3 -based lead-free piezoceramics under uniaxial stress conditions
| Autor: | Mao-Hua Zhang, Jing-Feng Li, Ke Wang, Jürgen Rödel, Kyle G. Webber, Fang-Zhou Yao, Florian H. Schader, Jurij Koruza, Li-Qian Cheng |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Piezoelectricity Stress (mechanics) Nonlinear system Compressive strength 0103 physical sciences Materials Chemistry Ceramics and Composites Forensic engineering Composite material 0210 nano-technology Polarization (electrochemistry) Actuator Voltage |
| Zdroj: | Journal of the American Ceramic Society. 100:2116-2122 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.14661 |
| Popis: | Piezoelectric actuators are typically preloaded with a modest mechanical compressive stress during actuation to reduce cracking and allow for operation in the dynamic range. In addition, actuators are required to carry out mechanical work during operation, resulting in a nonlinear relationship between stress and actuation voltage. In fact, mechanical loading can significantly impact the electromechanical performance of lead-free piezoelectrics. Herein, we report the dependence of electromechanical properties of CaZrO3 modified (K,Na)NbO3-based lead-free piezoceramics on uniaxial compressive stress, comparing to their lead-based counterparts. It is demonstrated that increased non-180° domain switching enhances the strain output at a moderate stress of approximately -50 MPa from room temperature to 150°C. Larger uniaxial stress, however, is found to suppress ferroelectric domain switching, resulting in the continuous strain and polarization decrease. |
| Databáze: | OpenAIRE |
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