Evaluation of basic physical parameters of quaternary Ge–Sb-(S,Te) chalcogenide glasses

Theoretical prediction of physical parameters of GexSb20−x Te80 (x = 11, 13, 15, 17, 19) bulk glassy alloys

“…According to the constraint theory, chalcogenides glasses can be classified in three types as: (a) floppy or under-coordinated bonds with r < 2.4 and N con < 3; (b) optically coordinated with r = 2.4 and N con = 3; (c) rigid and over coordinated with r > 2.4 and N con > 3 [14]. In the system under investigation r increases from 2.31 to 2.39.…”

“…The values of packing density are found to increase with addition of Ge content. It may be said that the decrease in glass density results in an increase in packing density (Table 4) due to smaller atomic radius and mass [14].…”

Estimations and implications of the mean binding energy and the fluctuation between the structural units in chalcogenide glasses

“…For instance, according to the covalent bond approach, the mean overall bond energy bE> for As 2 S 3 is calculated to be bE> ≈ 2.4 [eV] [6]. This magnitude is comparable to the bond energy calculated from the Pauling relation [19][20][21]. On the other hand, the magnitude of E 0 Z 0 for the same material is much smaller, E 0 Z 0 ≈ 0.56 [eV].…”

Study of As―Se―Te glasses by neutron-, X-ray diffraction and optical spectroscopic methods

“…The density of the synthesized materials was measured by applying the Archimedes method using the hydrostatic weighing in xylene, the measurement procedure is written in detail elsewhere [8]. After that, part of the samples were powdered for the neutron diffraction measurements, while the other part was cut into~4 mm thick slices and polished on one side for optical measurements.…”