A composition dependent thermal behavior of GexSe35−xTe65 glasses

Enthalpy relaxation kinetics of Ge20Te(80-y)Seyfar-infrared glasses in the glass transition range

“…GeTe 4 ), which however do not have appropriate mechanical and thermokinetic properties. In order to stabilise the Ge-Te matrix and decrease its tendency towards crystallisation, small amounts of Se (up to 10 at.%) are usually introduced into the parental glass [5][6][7][8]. Despite the great potential of the Ge-Te-Se infrared glasses, only very few information regarding their short-(related to crystallisation tendency) and long-term stability (related to structural relaxation processes) can be accessed through literature.…”

“…In the present article, the enthalpy relaxation processes (the glass transition kinetics) will be studied for the Ge 20 Te (80-y) Se y glasses, where y = 0-8 at.% (note that in case of the GeTe 4 matrix the addition of approx. 4 at.% of Se is considered optimal with regard to the necessary compromise between the optical and thermal properties [5][6][7][8]). …”

Untitled

“…4, Ge-Se (170 kJ/mol) and Se-Se bonds (184 kJ/mol) are existed in the glass network of Ge 12.5 Se 87.5 glass [28]. And with the introduction of Te, new bonds of Te-Se (170 kJ/mol) and Te-Te (138.2 kJ/mol) are formed in Ge 12.5 Se 87.5-x Te x glasses [25,28], at the depletion of Se-Se bonds. Consequently, the introduction of Te leads to the decreasing average bond energy of Ge 12.5 Se 87.5-x Te x glasses, which should contribute to the decreasing trends of H v and T g .…”

“…It thus provides a series of nice model glasses for exploring the composition-structure-property relationship of Te-containing glasses. Various experimental methods including XRD [21], Raman spectra [22], solid-state NMR [23,24], and thermal analysis [25] have been employed to demonstrate the structure and properties of Ge-Se-Te glasses. The structural motifs of [GeSe 4 ] tetrahedra, Se/Te-mixed Ge tetrahedra, and Te-Te bonds were evidenced to play a dominant role in the corresponding glass network structure.…”

Effect of SnI2 on the thermal and optical properties of Ge–Se–Te glasses

“…Previously, As-Se-Te has been considered to be a suitable candidate for drawing optical fibers from a glass rod due to its high stability toward crystallization [5]. In comparison, Ge-Se-Te chalcogenide glasses are more environmentally friendly than As-based chalcogenides, making them ideal for the fabrication of various devices [6,7]. The glass composition Te 76 Ge 21 Se 3 has been reported as a stable glass with the wide transparency known to date [8].…”