Filtern
Volltext vorhanden
- nein (1) (entfernen)
Erscheinungsjahr
- 2021 (1)
Dokumenttyp
- Wissenschaftlicher Artikel (1) (entfernen)
Sprache
- Englisch (1) (entfernen)
Gehört zur Bibliographie
- ja (1)
Schlagworte
- P(VDF-TrFE-CFE) (1) (entfernen)
Institut
- Institut für Physik und Astronomie (1) (entfernen)
Non-linear dielectric spectroscopy (NLDS) is employed as an effective tool to study relaxation processes and phase transitions of a poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) relaxor-ferroelectric (R-F) terpolymer in detail. Measurements of the non-linear dielectric permittivity epsilon 2 ' reveal peaks at 30 and 80 degrees C that cannot be identified in conventional dielectric spectroscopy. By combining the results from NLDS experiments with those from other techniques such as thermally stimulated depolarization and dielectric-hysteresis studies, it is possible to explain the processes behind the additional peaks. The former peak, which is associated with the mid-temperature transition, is found in all other vinylidene fluoride-based polymers and may help to understand the non-zero epsilon 2 ' values that are detected on the paraelectric phase of the terpolymer. The latter peak can also be observed during cooling of P(VDF-TrFE) copolymer samples at 100 degrees C and is due to conduction and space-charge polarization as a result of the accumulation of real charges at the electrode-sample interface.