The Effect of Electric Poling on the Performance of Lead-Free (1−x )Ba(Zr0.2 Ti0.8 )O3 -x (Ba0.7 Ca0.3 )TiO3 Piezoceramics
| Autor: | Mark Hoffman, Matthias C. Ehmke, Julia Glaum, John E. Blendell, Keith J. Bowman |
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| Rok vydání: | 2013 |
| Předmět: |
010302 applied physics
Permittivity Piezoelectric coefficient Materials science Condensed matter physics business.industry Poling 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Ferroelectricity Optics Electric field 0103 physical sciences Materials Chemistry Ceramics and Composites Texture (crystalline) 0210 nano-technology business |
| Zdroj: | Journal of the American Ceramic Society. 96:3805-3811 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.12586 |
| Popis: | The effect of increasing poling fields on the properties of (1−x)BZT–xBCT compositions across the morphotropic phase boundary (MPB) is studied using large signal polarization and strain, small signal permittivity and piezoelectric coefficient, and XRD measurements. Successive poling causes charge carrier migration inducing an internal bias field, which becomes large with respect to the coercive field resulting in biased ferroelectric and ferroelastic switching. Improvements in piezoelectric coefficient of 9% are significantly smaller in the tetragonal 60BCT composition compared with the improvement of approximately 50% in the rhombohedral 40BCT and MPB 50BCT compositions. While the properties continue to change with increased poling fields, the remnant ferroelastic domain texture parallel to the field direction, as observed from XRD, stays approximately constant. The improvement in overall domain alignment leading to largely enhanced intrinsic piezoelectricity originates from the alignment of 180° domains and possibly non-180° domains in grains with orientations inclined to the electric field. As a result, poling is most effective in BZT–BCT materials that have low coercive fields, show low distortions and possess more polarization orientations, such as compositions in the rhombohedral phase field or near the MPB. |
| Databáze: | OpenAIRE |
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