Large strain of temperature insensitive in (1–x)(0.94Bi0.5Na0.5TiO3–0.06BaTiO3) –xSr0.7La0.2TiO3 lead-free ceramics
| Autor: | Nianshun Zhao, Jiangwei Ma, Yunyan Zhou, Yungui Shi, Huiqing Fan, Xiaohu Ren |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Strain (chemistry) Process Chemistry and Technology Analytical chemistry 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystal Tetragonal crystal system Phase (matter) visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic 0210 nano-technology |
| Zdroj: | Ceramics International. 44:11331-11339 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.03.182 |
| Popis: | Novel (1– x )(0.94Bi 0.5 Na 0.5 TiO 3 –0.06BaTiO 3 )– x Sr 0.7 La 0.2 TiO 3 ternary lead-free ceramics (BNBT– x SL, x = 0.00–0.08) were fabricated by the widely used solid-state sintering technique. The crystal phase, microstructure, dielectric relaxation, piezoelectric, and electromechanical properties of each composition were systematically analyzed. It is found that the addition of SL has little effect on the crystal phase and grain morphology, but it can remarkably improved the relaxation property of the ceramic sample and gave rise to favourable dielectric properties in a wide range of temperatures. In addition, as the SL content increases, the ferroelectric to relaxor temperature ( T F-R ) is adjusted to below ambient temperature. More importantly, the decay of ferroelectric phase resulted in a significant increase in strain value: the large strain of 0.5% with normalized strain of 625 pm/V was obtained at 80kv/cm and x = 0.04. Finally, the composition exhibited high strain of temperature insensitivity range from room temperature to 100 °C, the strain value remained above 0.4% and kept within 5%. The results are due to the coexistence of rhombohedral polar-nanoregions (PNRs) and tetragonal PNRs during the relaxor region. This result is of great importance to the developments of temperature-insensitive strain sensors and actuators. |
| Databáze: | OpenAIRE |
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