Comparison of some models for nonlinear fitting analysis of TSC measurements

Basic differential equations for thermally stimulated conductivity (TSC) me asurement have no analytical solutions even for the simplest cases. Therefo re, analysis of the obtained results is very difficult. The same equations are used also for thermoluminescence (TL). Nevertheless, TL analysis is muc h easier due to a number of approximate models, such as general order kinet ics and mixed order kinetics. In this paper we discuss usefulness of the ap proximations in description of TSC with respect to determination of trap pa rameters using nonlinear curve fitting analysis. For this purpose appropria te equations were derived. The results are compared to the recently derived method based on the quasi equilibrium approximation. (C) 2001 Elsevier Sci ence B.V. All rights reserved.