Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440716 | Journal of the European Ceramic Society | 2017 | 4 Pages |
Abstract
Lead-free piezoceramics with the composition 0.7(Bi1-xNdx)FeO3-0.3BaTiO3+0.1 wt% MnO2 (BNxF-BT) were prepared using a conventional solid state route. X-ray diffraction and temperature dependent permittivity measurements indicated a transition from a composition lying at a morphotropic phase boundary (MPB) to a pseudocubic phase as a function of Nd concentration. The highest maximum strain (Smax â¼Â 0.2% at 60 kV/cm) and effective piezoelectric coefficient (d33* = 333 pm/V) were obtained at room temperature for the composition BN0.02F-BT. The decrease in remanent polarization (Pr) and Berlincourt d33 with increase in Nd concentration can be attributed to the coexistence of ferroelectric and relaxor phases. In-situ polarisation and strain measurements revealed an increase in Pr and d33* with temperature and a reduction in the coercive field EC. Presumably this behavior is due to a combination of thermally activated domain wall motion and lowering of the activation energy for a field induced relaxor-ferroelectric transition, as the Curie maximum is approached.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Dawei Wang, Amir Khesro, Shunsuke Murakami, Antonio Feteira, Quanliang Zhao, Ian M. Reaney,