Fabrication of (Bi0.5K0.5)TiO3 modified BaTiO3-Bi(Mg0.5Ti0.5)O3-BiFeO3 piezoelectric ceramics
| Autor: | Satoshi Wada, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Gopal Prasad Khanal |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Maximum temperature Fabrication Materials science Analytical chemistry 02 engineering and technology Dielectric Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Polarization (electrochemistry) Saturation (magnetic) Critical exponent |
| Zdroj: | Journal of the European Ceramic Society. 41:4108-4115 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2021.02.015 |
| Popis: | The lead-free x(Bi0.5K0.5)TiO3-0.23BaTiO3-0.02Bi(Mg0.5Ti0.5)O3-(0.75-x)BiFeO3 piezoelectric ceramics (x = 0.05, 0.07, 0.09, and 0.11) were prepared by solid-state reaction method. The increase of (Bi0.5K0.5)TiO3 concentration revealed a decrease of dielectric maximum temperature (Tm), however, the values were higher than 420 °C. The Rietveld structure refinement for each composition showed pseudo-cubic symmetry and the rhombohedral distortion (90 - αF) was gradually decreased from 0.27° to 0.09° for x = 0.05 and 0.11, respectively. The saturation and remanent polarization were increased and a coercive field was decreased, while the critical exponent (γ) was increased from 1.407 (x = 0.07) to 1.821 (x = 0.11) revealing more relaxor-like behavior with higher (Bi0.5K0.5)TiO3 content. The remanent polarization, coercive field, and piezoelectric strain constant of 31.9 μC/cm2, 23.6 kV/cm, and 315 pm/V, respectively, obtained in the composition with x = 0.11 are significantly higher than those reported previously for other Bi-based piezoelectric ceramics with Tm>250 °C. |
| Databáze: | OpenAIRE |
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