Enthalpy relaxation in GexSe1−x chalcogenide glasses

Apparent activation energy of structural relaxation for Se70Te30 glass

“…However, if this finding is compared to our previous results on Se [11], PVAc [12] or Ge 2 Se 98 and As 2 Se 98 [13], the Se 70 Te 30 glass is the first material for which also the evaluation of Dh * from classic cycles matches the Dh * value obtained from curve-fitting. The problem of Dh * evaluated from classic cycles being considerably larger in comparison with values obtained by other techniques is not rare in the literature [14][15][16] and no explanation was offered for this feature so far. To the author's knowledge, this is the first case when such a discrepancy (the evaluation from classic cycles working only for certain materials) is reported for the data measured entirely in one laboratory.…”

Volume and enthalpy relaxation of a-Se in the glass transition region

“…Broken lines represent AGS fit (parameters in Table 2). of x and Dh * /R parameter were reported by Cortés et al [10] These parameters were obtained from cooling scans and from peak shift method. If the same method is applied to our data reported here, the value of parameter x = 0.51 ± 0.02 is obtained.…”

“…Hamada et al [9] studied isothermal volume contraction by classical mercury dilatometry and interpreted experimental data within Williams, Landel, and Ferry's equation. Enthalpy relaxation of amorphous selenium has been studied by Cortés et al [10] and discussed within the Tool-Naraynaswamy-Moynihan equation. It has been found that the introduction of the germanium atoms in the selenium chains changes the distribution of relaxation times, increases the relaxation rate per decade, and decreases apparent activation energy.…”

Relaxation in Ge2Se98 and As2Se98 glasses

“…Therefore quite a number of structure-related studies e.g. [11][12][13][14] can be found in literature but, surprisingly, only few papers deal with structural relaxation [15][16][17][18].…”