Reflecting the fact that the terpolymer P(VDF-TrFECFE)
has been completely converted into a relaxor, no
ferro-paraelectric phase transition is observed in the dielectric
spectra. The terpolymer has a βr dielectric dispersion,
in addition to βc and γ relaxations, that is located at
similar temperatures to the βa of the copolymer. However,
there is a much larger dielectric constant change associated
with the βr process compared to βa. Combining this
result with those from quenched and poled samples, as
well as the behavior of the copolymer, indicates that the βr
process originates primarily from the boundary motions
and reorientation of nanoclusters in the crystalline phase,
similar to the dynamics observed in relaxor ferroelectric
ceramics. The experimental data also reveal a broad relaxation
time distribution associated with the βr process,
whose distribution width increases with reduced temperature.
Fitting of the dielectric data demonstrates that the
averaged relaxation time (as measured by the peak of the
imaginary dielectric constant) follows the V-F law.
Reflecting the fact that the terpolymer P(VDF-TrFECFE)has been completely converted into a relaxor, noferro-paraelectric phase transition is observed in the dielectricspectra. The terpolymer has a βr dielectric dispersion,in addition to βc and γ relaxations, that is located atsimilar temperatures to the βa of the copolymer. However,there is a much larger dielectric constant change associatedwith the βr process compared to βa. Combining thisresult with those from quenched and poled samples, aswell as the behavior of the copolymer, indicates that the βrprocess originates primarily from the boundary motionsand reorientation of nanoclusters in the crystalline phase,similar to the dynamics observed in relaxor ferroelectricceramics. The experimental data also reveal a broad relaxationtime distribution associated with the βr process,whose distribution width increases with reduced temperature.Fitting of the dielectric data demonstrates that theaveraged relaxation time (as measured by the peak of theimaginary dielectric constant) follows the V-F law.
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