Electronic structure of Ge–As–Te glasses

2D-correlation analysis applied to in situ and operando Mössbauer spectroscopy

“…In other cases spectra are broadened due to a mixture of phases or an amorphization of the particles. The help of electronic structure calculation [18,19] allows non-trivial experimental attributions when mathematical ambiguities due to overlapping peaks was observed. Interpretation of both isomer shift and quadrupole splitting variations was explained with such theoretical approaches [20,21].…”

Physical evolution in network glasses of the Ag–As–Te system

“…The variation of switching voltage of As 20 Te 80Àx Ag x and As 40 Te 60Àx Ag x glasses had been studied [3] as a function of composition for a sample of 0.25 mm thickness. The study of telluride glasses has found an increasing interest because of their applications as switching or memory devices and for far-infrared transmission [4]. Chalcogenide glasses are characterized by a high density of localized states with the absence of spin paramagnetism.…”

Rapid quenching and glass formation in chalcogenide glasses: Preparation and properties of Ge–As–Te glasses over an extended composition ranges

“…When the network crosses from Te-rich to As-rich, the ratio between the numbers of As-Te and As-As decreases (increase in the number of As-As bonds) [19]. In binary As-Te glasses it is shown that the local order is strongly affected when shifts from Te-rich to As-rich glasses by the formation of 'As-As locks' in the As-rich side [17].…”

“…The physical properties measured as a function of composition are expected to exhibit extrema at this critical composition [23,24]. Generally in chalcogenide glasses, Ge, As and Te are four, three, and two-fold coordinated, respectively [8,19] and Z av for Ge 7.5 As x Te 92.5Àx glasses can be calculated as [4*7.5 + 3x + 2(92.5Àx)]/100. For example, Z av = 2.40 for the glass with x = 25 (Ge 7.5 As 25 Te 67.5 ).…”