ISSN:
1572-8943
Keywords:
activation energy
;
chalcogenide glass
;
DSC
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Results of differential scanning calorimetry (DSC) at different heating rates on Se2Ge0.2Sb0.8 chalcogenide glass are reported and discussed. As the heating rate (α) changed, also the glass transition temperature (T g) and onset temperature of crystallization (T c) changed. As the value of the transition activation energyE t changed, the crystallization fraction (χ), heat flow (Δq and the crystallization peak temperature (T p) also changed. The value of the effective activation energy of crystallizationE c was calculated by means of six different methods. The Se2Ge0.2Sb0.8 chalcogenide glass has two crystallization mechanisms, a one-dimensional and an other surface crystallization growth. The average value ofE t for Se2Ge0.2Sb0.8 is equal to 194.95±3.9 kJ·mol−1 and the average value ofE c is equal to 164±3.3 kJ·mol−1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01979957
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