Analysis of two-dimensional energy and relaxation-time distributions from temperature-dependent broadband dielectric spectroscopy

 
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1998 (EN)
Analysis of two-dimensional energy and relaxation-time distributions from temperature-dependent broadband dielectric spectroscopy (EN)

Krauthauser, HG (EN)
Kruse, T (EN)
Pelster, R (EN)
Pissis, P (EN)
Nimtz, G (EN)

N/A (EN)

We present a method to determine the two-dimensional 2D distribution G(W,ln tau(o)) of the relaxation time tau=tau(o)exp(W/k(B)T) using an inversion of temperature-dependent broadband dielectric data. In contrast to the usual evaluation of 1D distributions g(tau), the 2D analysis reveals whether the broadening of a relaxation peak has its physical origins in a variation of the activation energy W, or the preexponential factor tau(o), or both. A study of the beta relaxation of a polymer blend demonstrates the validity of the analysis. We compare the distribution obtained from dielectric ac data (5 Hz-300 MHz, 100 K-300 K) with the results of a thermally stimulated depolarization currents sampling technique. The contour line of G(W,ln tau(o)) is shown to follow the compensation law. [S0163-1829(98)05815-9]. (EN)

journalArticle

Sampling Technique (EN)
Polymer Blend (EN)
Activation Energy (EN)
Temperature Dependence (EN)
PARAMETERS (EN)
SPECTRA (EN)
INVERSION (EN)
Dielectric Spectroscopy (EN)
Relaxation Time (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Physical Review B - Condensed Matter and Materials Physics (EN)

1998


AMERICAN PHYSICAL SOC (EN)



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