Abstract
In this work, the activation energies of crystallization of amorphous Se were studied under non-isothermal conditions using a differential scanning calorimetric (DSC) technique. The Johnson-Mehl-Avrami and isoconversional models were used to describe the DSC crystallization data. The isoconversional methods of Friedman, Kissinger-Akahira-Sunose (KAS) and Vyazovkin were used to determine the variation of the activation energy for crystallization with temperature, E-alpha (T). The KAS and Vyazovkin methods gave identical values, and the range of E-alpha (T) was found to vary in the range 110.4-44.2 kJ mol(-1), while the Friedman method gave lower values with E-alpha (T) in the range 100.5-28.3 kJ mol(-1). The effects of annealing were revealed by studying the morphology of the samples with a scanning electron microscope. (C) 2008 Elsevier B.V. All rights reserved.