Dielectric and piezoelectric properties of porous lead-free 0.5Ba(Ca0.8Zr0.2)O3-0.5(Ba0.7Ca 0.3)TiO3 ceramics
| Autor: | James Roscow, Mengying Xie, Yan Zhang, Christopher R. Bowen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology Dielectric 010402 general chemistry 01 natural sciences Materials Science(all) Piezoelectrics General Materials Science Ceramic Composite material Porosity Mechanical Engineering Ferroelectric ceramics Lead-free ceramic 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Piezoelectricity Porous 0104 chemical sciences Mechanics of Materials visual_art Volume fraction visual_art.visual_art_medium Dielectrics 0210 nano-technology Porous medium |
| Zdroj: | Zhang, Y, Xie, M, Roscow, J & Bowen, C 2019, ' Dielectric and piezoelectric properties of porous lead-free 0.5Ba(Ca 0.8 Zr 0.2 )O 3-0.5(Ba 0.7 Ca 0.3 )TiO 3 ceramics ', Materials Research Bulletin, vol. 112, pp. 426-431 . https://doi.org/10.1016/j.materresbull.2018.08.031 |
| ISSN: | 0025-5408 |
| Popis: | Porous barium calcium zirconate titanate 0.5Ba(Ca0.8Zr0.2)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT) lead-free ferroelectric ceramics were fabricated via a burnt polymer spheres (BURPS) technique by introducing corn starch as the pore-forming agent. The effect of porosity on the microstructure, dielectric, and piezoelectric properties of the porous materials were investigated. An increase in porosity volume fraction from 10% to 25% resulted in an increase in the hydrostatic charge coefficient (dh), which was 140 to 560% higher than that of the dense BCZT material. An increase in porosity fraction from 10% to 25% also lead to a decrease in relative permittivity that was 16.7% to 60.4% lower than the dense material. These two changes in properties provided a significant enhancement of the hydrostatic figure of merit (dh∙gh) for the porous ceramic; for example the dh∙gh of the 25 vol.% porous BCZT ceramic was 158 times more than the dense ceramic and demonstrates the potential of porous lead-free ferroelectrics for piezoelectric transducer devices. Reasons for the significant enhancement in piezoelectric performance of the porous ceramics are discussed. |
| Databáze: | OpenAIRE |
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