R. M. NEAGU¹, E. R. NEAGU^1,*

Abstract

It is analysed the possibility to determine the relaxation parameters and their distributions by use of the Fractional Polarization Thermally Stimulated Discharge Current (FPTSDC) technique. For every elementary peak i there is a relationship between the activation energy Wi, the pre-exponential factor τ0i, the temperature of the maximum current of the peak Tmi and the heating rate b, that can be used to obtain useful information concerning the values of the relaxation parameters or about their distribution. Realistic data for elementary peaks, in the range of the local β relaxation, are used for model simulations to analyze the lower limits below which we cannot discriminate between the existence of a distribution of the relaxation parameters and the normal uncertainty intervals. We will assume that at any temperature T the incertitude interval in activation energies ∆W is at least equal with ± kT and will determine the incertitude interval for τ0i and for Tmi. The minimum or natural incertitude interval for the relaxation parameters will by analysed. As long as the experimental current can be fitted with an elementary peak and the uncertainties affecting the relaxation parameters are low, i.e. ∆W ≅ kTm and ∆τ0 ≅ τ0, the distribution functions cannot be determined accurately..

Keywords

Thermally stimulated discharge current, Distribution of relaxation times.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

R. M. NEAGU, E. R. NEAGU, The distribution of the relaxation times and the thermally stimulated depolarization currents, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 949-955 (2006)

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