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- Title
Comparison between lead free BaTio<sub>3</sub>/PDMS and doped - PZT/PDMS composite on ferroelectric characteristics.
- Authors
Amarande, L.; Stancu, V.; Botea, M.; Toma, V.; Ciobanu, R.; Pintilie, L.
- Abstract
Composites of BaTiO3 (BT) and doped-PZT (d-PZT) micro-particles randomly dispersed in a PDMS matrix were prepared by a molding process. The morpho-structural characterization, performed by SEM and XRD, showed ceramic micro-grains of cubic BT and orthorhombic d-PZT, randomly dispersed in the PDMS matrix. Polarization (P) as a function of the applied field (E) was measured for composite samples, as well as for polymer samples. Hysteresis loops typical for a dielectric material were obtained, but also atypical ones, especially for higher fraction of polymer in composite, lower fields and shorter measuring periods, as a result of the dielectric relaxation in polymer and the presence of interfacial polarization charges at the contact between polymer and ferroelectric. All these composites show very low polarizations (less than 0.2 µC/cm² and 0.05 µC/cm² the maximum and remnant polarization, respectively), caused by the very low dielectric constant of the polymer (less than 10), which drastically reduces, up to 100 times, the electric field effectively applied to the ferroelectric. Weak pyroelectric response was recorded on BT/PDMS, but a typical behavior of a pyroelectric detector was observed. A figure of merit of the material which exceeds 10-4 m²/C was estimated.
- Subjects
PYROELECTRIC detectors; DIELECTRIC materials; DIELECTRIC relaxation; SURFACE charging; HYSTERESIS loop; PERMITTIVITY; FERROELECTRIC polymers
- Publication
Digest Journal of Nanomaterials & Biostructures (DJNB), 2021, Vol 16, Issue 3, p747
- ISSN
1842-3582
- Publication type
Article
- DOI
10.15251/djnb.2021.163.747