Structural interpretation of the enthalpy relaxation kinetics of (GeTe4)y(GaTe3)1−y far-infrared glasses

Crystallization behavior of (GeTe4)x(GaTe3)100-x glasses for far-infrared optics applications

“…In addition, separated Te micro-regions are possibly formed within the amorphous Ge-Ga-Te structure. [36] Micrographs in Figs. 1C and 1D show partially DSC-crystallized (GeTe4)60(GaTe3)40 and (GeTe4)86(GaTe3)14 bulk samples, respectively (the partial crystallinity was achieved nonisothermally at 5 °C.min -1 ).…”

“…The marked invariance of the crystallization onset with changing Ga content indicates that in case of the Ge-Ga-Te glasses the compositional evolution of glass stability will depend mostly on the position of Tg (due to the presence of eutectic, i.e. compositionally invariant Tm), the values of which were taken from [36],as depicted in Fig. 3D.…”

Structural relaxation in chalcogenide glasses

“…The logarithmic time interval (LTI) for Δ T = 10 K, calculated by Equation () for ß = 0.9 and 0.5 (blue solid lines). Points correspond to the Tool–Narayanaswamy–Moynihan (TNM) parameters reported for chalcogenide glasses (see Table 1), 11–35 oxide glasses, 41–49 and organic polymers: polystyrene (PS), 50,51 polycarbonate (PC), 52 polyvinyl acetate (PVAc), 53,54 epoxy resin, 55 polymethyl methacrylate (PMMA), 51,53 polyethylene terephthalate (PET), 56 and polyvinyl chloride (PVC) 51 …”

“…on non‐isothermal enthalpy relaxation of As 2 Se 3 chalcogenide glass was later extended to a study of volume relaxation of the same material by length dilatometry, 12 showing that the fictive temperature assessed from volume and enthalpy relaxation data of this material seems to be identical within the margin of experimental errors. There are many similar papers presenting a full set of TNM parameters ( h * / R , ln A , x , ß ) for selected glassy chalcogenides, as shown in Table 1 13–35 . The TNM parameters were obtained from non‐isothermal heat capacity data or isothermal volume relaxation data by using fitting or optimization regression methods.…”

“…TNM formalism has been successfully applied to describe structural relaxation in many different amorphous materials 7–10 . This paper partially summarizes the application of TNM formalism in the field of chalcogenide glasses reported during the last 45 years 11–35 . The isothermal relaxation rate R f (10), calculated from TNM parameters for both enthalpy and volume relaxation data, is proposed to be a useful parameter for structural relaxation kinetics.…”