کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1482375 | 991564 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enthalpic relaxation in Ge2Sb2Se5 glass Enthalpic relaxation in Ge2Sb2Se5 glass](/preview/png/1482375.png)
Differential scanning calorimetry measurements were used to study enthalpic structural relaxation of Ge2Sb2Se5 glass. The Tool-Narayanaswamy-Moynihan (TNM) model was applied to describe the relaxation behavior. The curve-fitting results showed a significant dependence on experimental conditions, true values of the TNM parameters needed to be confirmed by the alternative non-fitting methods – apparent activation energy was confirmed by evaluations from classic and intrinsic cycles, the non-linearity parameter was determined on the basis of peak-shift method. Discussion on the origin of the trend in curve-fitting results was conducted in terms of influence of either the nonlinear Cp-T dependence or anomalous relaxation behavior of the material itself. For the latter case a suggestion regarding the proceeding molecular mechanisms was made.
► Enthalpic structural relaxation in Ge2Sb2Se5 glass was studied by DSC.
► Evaluated Tool-Narayanaswamy-Moynihan parameters show dependence on experimental conditions.
► Non-fitting methods of TNM parameters evaluation specify curve-fitting results.
► Relaxation dynamics on molecular scale was discussed on the basis of TNM parameters.
Journal: Journal of Non-Crystalline Solids - Volume 358, Issue 4, 15 February 2012, Pages 804–809