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Kinetic phenomena in non-crystalline materials studied by thermal analysis |
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| Authors: | Málek J Pustková P Sháněová J |
| Institution: | (1) Department of Physical Chemistry, Joint Laboratory of Solid State Chemistry Nám. Čs, University of Pardubice, Faculty of Chemical Technology, Legií 565, Pardubice, 532 10, Czech Republic;(2) Department of Inorganic Technology, Nám. Čs. Legií, University of Pardubice, Faculty of Chemical Technology, 565 Pardubice 532 10, Czech Republic |
| Abstract: | The structural relaxation and viscosity behavior of Ge38S62 glass has been studied by thermomechanical analysis. The relaxation response to any thermal history is well described by the Tool-Naraynaswamy-Moynihan model. The apparent activation energy of structural relaxation is very close to the activation energy of viscous flow (Eη=478±12 kJ mol-1). However, the activation energy of crystal growth obtained by optical microscopy is about one half of this value. Similar result has been obtained from isothermal DSC measurement (Ea=220±20 kJ mol-1). The kinetic analysis of these data reveals interface controlled crystal growth with zero nucleation rate. This revised version was published online in July 2006 with corrections to the Cover Date. |
| Keywords: | crystallization viscosity kinetic models glass transition chalcogenide glasses structural relaxation |
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