1. Revisiting the broadband dielectric properties of high-sensitivity piezoelectric BiScO3-PbTiO3: Size effects.
- Author
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Balčiūnas, S., Ivanov, M., Grigalaitis, R., Banys, J., Amorín, H., Castro, A., and Algueró, M.
- Subjects
BROADBAND dielectric spectroscopy ,FERROELECTRIC ceramics ,SIZE effects in thin films ,PIEZOELECTRIC ceramics - Abstract
The dielectric properties of high-temperature piezoelectric 0.36BiScO
3 -0.64PbTiO3 ceramics located at the morphotropic phase boundary with decreasing average grain sizes from 1.6 μm down to 26 nm were investigated in the 100-500 K temperature range and 100 Hz-40 GHz frequency region. Analysis of the current data and comparison with results of Porokhonskyy et al. [Appl. Phys. Lett. 83, 1605 (2003)] allows a deeper understanding of the polarization mechanisms in the system to be obtained. The main contribution to dielectric permittivity comes from the dynamics of polar nanoregions embedded into the ferroelectric matrix. Domain walls give significant contribution to permittivity in the case of submicrometer grains. A process related to coupling of polarization to strain is observed at microwave frequencies. Its characteristic frequency scales inversely proportional to grain size and is not dependent on domain thickness. [ABSTRACT FROM AUTHOR]- Published
- 2015
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