Enhanced piezoelectric properties and low electrical conductivity of Ce-doped Bi7Ti4.5W0.5O21 intergrowth piezoelectric ceramics
| Autor: | Xiangping Jiang, Chao Chen, Xin Nie, Junsheng Zhuang, Xiaokun Huang, Yujian Jiang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Dopant biology Process Chemistry and Technology 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Piezoelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Aurivillius Electrical resistivity and conductivity 0103 physical sciences Materials Chemistry Ceramics and Composites Curie temperature Orthorhombic crystal system Dielectric loss Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 46:26616-26625 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.07.130 |
| Popis: | New types of Ce-doped CexBi7-xTi4.5W0.5O21 (BTW-BIT-xCe) Aurivillius intergrowth ceramics with high Curie temperatures were synthesized to improve the piezoelectric performances as well as the conduction behaviour, and these ceramics exhibit great potential for high-temperature lead-free piezoelectric applications. The crystal structure, electrical properties and conduction behaviour of BTW-BIT-xCe samples were analysed thoroughly. The XRD patterns combined with Rietveld refinements of the patterns showed that the crystal structure transformed from orthorhombic structure towards pseudo-tetragonal structure with increasing CeO2 dopant, indicating that a higher symmetry was obtained. The dielectric properties of Ce-doped samples were improved, accompanied by a significant drop in the dielectric loss and a slight decreased Curie temperature (705 °C–683 °C). An enhanced piezoelectric constant d33 of 25.3 pC/N was obtained in BTW-BIT-0.12Ce, which may be attributed to a common decrease in the electrical conductivity and coercive field. Besides, a low electrical conductivity of 2 × 10-6 S/cm at 540 °C was achieved in the same component owing to a decreased concentration of the oxygen vacancies, which was verified by analyses on XPS spectra. The above results indicate that Ce-doped BTW-BIT samples have great development potential for high temperature piezoelectric applications. |
| Databáze: | OpenAIRE |
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