TY  - JOUR
A1  - Raman Venkatesan, Thulasinath
A1  - Gulyakova, Anna A.
A1  - Frübing, Peter
A1  - Gerhard, Reimund
T1  - Electrical polarization phenomena, dielectric relaxations and structural transitions in a relaxor-ferroelectric terpolymer investigated with electrical probing techniques
JF  - Materials research express
N2  - Dielectric Relaxation Spectroscopy (DRS) and Thermally Stimulated Depolarization Current (TSDC) measurements were employed to study dielectric-relaxation processes, structural transitions and electric-polarization phenomena in poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) terpolymer films. Results from DRS confirm the existence of two separate dispersion regions related to a para-to-ferroelectric phase transition and to the glass transition. The dipolar TSDC peak correlates with the loss peak of the ? relaxation that represents the glass transition. The electric polarization calculated from the dipolar TSDC peak (glass transition) shows a non-linear electric-field dependence and saturates at high electric poling fields. As the observed behaviour is essentially the same as that of the electric polarization obtained from direct polarization-versus-electric-field hysteresis measurements, TSDC experiments are also suitable for studying the polarization in relaxor-ferroelectric polymers. A saturation polarization of 44 mC m(?2) was found for an electric field of 190 MV m(?1).
KW  - P(VDF-TrFE-CFE) terpolymer
KW  - relaxor-ferroelectric polymers
KW  - dielectric relaxation spectroscopy
KW  - thermally stimulated depolarization current
KW  - electrical polarization hysteresis
Y1  - 2019
U6  - https://doi.org/10.1088/2053-1591/ab5352
SN  - 2053-1591
VL  - 6
IS  - 12
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -