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1 Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

1 2001

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On the application of quasi-equilibrium conditions to the numerical analysis of simultaneous TL/TSC measurements

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Mandowski A. , Świątek J.

tom Vol. 5

79--86

Thermally stimulated relaxation (TSR) phenomena are analysed on the basis of several analytical approximations. These approximations - e.g. the general order kinetics (GOK) model and the mixed order kinetics(MOK) are usually oversimplified with respect to the real phenomena under study. Therefore, the application of these equations often leads to erroneous results or misleading interpretations. Some recent papers have shown the advantage of using certain formulae directly derived from the simple trap model to the analysis of thermoluminescence (TL) and thermally stimulated conductivity (TSC) experiments. These equations allow to construct very fast and efficient algorithms to determine trap parameters by application of nonlinear fitting methods. The only disadvantage of this approach is a relatively high number of unknown parameters. To overcome the difficulty we applied the equations to simultaneous TL/TSC measurements, which are closely related phenomena. Using same previously derived relations it was possible to reduce the number of parameters of the model. To test the accuracy of the method the fitting algorithm was applied to a series of computer generated TL/TSC curves calculated from the simple trap model equations.