Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7899064 | Journal of the European Ceramic Society | 2013 | 8 Pages |
Abstract
The piezoelectric properties of tetragonal BZT-BCT materials have been shown to be improved by using the field cooling poling method. It is shown that the piezoelectric coefficient of tetragonal BZT-BCT materials increases with higher poling temperature, and the optimum poling temperature lies near the Curie temperatures for a broad range of compositions. It is also observed from in situ X-ray diffraction measurements with an applied electric field that the magnitude of domain alignment is enhanced with electrical poling at higher electric fields, whereas the remnant ferroelastic domain texture is not affected. Furthermore, these results show a direct correlation between the development of internal bias field, which is induced by the accumulation of defect charge carriers, and the enhanced piezoelectric coefficient. These observations suggest an important role played by the alignment of defect charge carriers in achieving optimum piezoelectric coefficient in lead-free piezoelectric ceramics.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Binzhi Li, Matthias C. Ehmke, John E. Blendell, Keith J. Bowman,