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Kinetic phenomena in non-crystalline materials studied by thermal analysis
Year: 2003
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 289-297
Titles:
Language Name Abstract Keywords
cze Kinetický jev v nekrystalických materiálech studovaných termickou analýzou 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 (Eç=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. chalkogenidová skla;krystalizace;skelná transformace;kinetické modely;strukturní relaxace;viskozita
eng Kinetic phenomena in non-crystalline materials studied by thermal analysis 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 (Eç=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. Chalcogenide Glasses;Crystallization;Glass Transition;Kinetic Models;Structural Relaxation;Viscosity

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