The shape factor of a thermoluminescence (TL) glow peak following mixed order (MO) kinetics has been reinvestigated. A modification of the existing equation of MO kinetics to include the filling factor , where is the initial concentration of trapped electrons and N is the concentration of the electron trap sites) has been proposed. The shifting of peak temperature for a MO kinetics peak with the change of filling factor and hence the irradiation dose absorbed by the sample is reported. A new set of expressions for the evaluation of the activation energy of a TL peak in the light of MO kinetics is presented. The applicability of the MO kinetics model is reported by fitting both the numerically simulated glow peak and the experimentally observed peak of -irradiated NaCl:I and x-irradiated BeO.
In the present paper a method is developed for the determination of the orders of kinetics and activation energies of thermoluminescence (TL) glow curves recorded in a hyperbolic heating scheme. The suitability of the present method is tested by applying it both to numerically computed and experimental TL peaks. PACS No.: 78.60kn
We report here our investigations on dark DC resistivity and optical absorption of chemical bath deposited CdS thin films prepared by chemical bath deposition. Crystallite sizes of about 30 nm are found from XRD using Scherrer formula with an added term for strain broadening. Energy-dispersive X-ray measurement shows correct stoichiometry of Cd and S atomic ratio. The grain size of the as-deposited film determined from both AFM and TEM is found to be ~180 nm. On vacuum annealing, the dark resistivity decreases from ~109 to 106 Ω-cm. Dark resistivity variation of as-deposited and vacuum-annealed films with temperature in the temperature region (95–350 K) reveals that each film exhibits two types of conduction in this temperature region. From the optical absorption study the optical band gap of as-deposited film is found to be ~2.29 eV.
We present a set of expressions for the determination of the activation energy of a thermoluminescence peak recorded with a hyperbolic heating scheme. It is demonstrated that the order of kinetics can be estimated from the fractional intensities at the points of inflection of the peak.
A method has been developed for the evaluation of activation energy of thermoluminescence peak recorded with hyperbolic heating scheme by taking into account temperature dependent frequency factor. We have arrived at a number of expressions of activation energy involving the peak temperature and/or temperatures corresponding to the two points of inflection of the peak. It has been observed that the temperature dependence of frequency factor might lead to an error of the order of 10% in the determination of activation energy.
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