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Чурбанов, М. Ф.; Shaposhnikov, R. M.; Skripachev, I. V.; Снопатин, Г. Е.

doi:10.1023/a:1021899405234

Cited by 3 publications

(2 citation statements)

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“…6, we use the MYEGA equation 1to predict the viscosity temperature dependence of As 2 Se 3 using both the activation energy E a derived by Ravindren et al 27 and that derived by Yang et al 64 The predicted viscosity is compared with published data from multiple authors. 29,35,60,62,65 The viscosity derived from Yang et al 64 shows an excellent fit with literature data. On the other hand, the viscosity derived by Ravindren et al 27 is largely overestimated and close to that of silica, the strongest known glass-former.…”

Section: Viscous Flow and Fragilitysupporting

confidence: 52%

“…Fragility plot for As 2 Se 3 . The red curve is derived from the MYEGA equation using the activation energy of Ravindren et al, 27 and the blue curve is from that of Yang et al 64 Experimental viscosity data are from Churbanov, 60 Angell, 62 Malek, 65 Nemilov, 29 and Musgraves. 35 High temperature values were obtained by oscillating cup viscometry.…”

Section: Viscous Flow and Fragilitymentioning

confidence: 99%

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Structural and chemical homogeneity of chalcogenide glass prepared by melt-rocking

Lucas

Coleman

Sen

et al. 2019

The Journal of Chemical Physics

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The chemical and structural homogeneity of selenide glasses produced by mechanical homogenization of the melt in a rocking furnace is investigated by Raman and Energy Dispersive Spectroscopy (EDS). Both techniques demonstrate that the glass is macroscopically homogeneous along the entire length of a 6 cm rod. EDS imaging performed over four orders of magnitude in scale further confirms that the glass is homogeneous down to the sub-micron scale. An estimate of the diffusion coefficient from experimental viscosity data shows that the diffusion length is far larger than the resolution of EDS and therefore confirms that the glass is homogeneous at any length scale. In order to investigate a systematic mismatch in physical properties reported in the literature for glasses produced by extended static homogenization, two germanium selenide samples are produced under the same conditions except for the homogenization step: one in a rocking furnace for 10 h and the other in a static furnace for 192 h. No difference in physical properties is found between the two glasses. The properties of an ultra-high purity glass are also found to be identical. The origin of the systematic deviation reported in the literature for germanium selenide glasses is therefore still unknown, but the present results demonstrate that homogeneity or dryness does not have a significant contribution in contrast to previous suggestions. The implications of glass homogeneity for technological applications and industrial production are discussed.

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Section: Viscous Flow and Fragilitysupporting

confidence: 52%

Section: Viscous Flow and Fragilitymentioning

confidence: 99%

Structural and chemical homogeneity of chalcogenide glass prepared by melt-rocking

Lucas

Coleman

Sen

et al. 2019

The Journal of Chemical Physics

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Flow of a Viscoplastic Arsenic Selenide Melt in Circular-Cylindrical Channels

et al. 2005

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The flow rate of molten arsenic selenide in circular-cylindrical channels was measured as a function of temperature and excess gas pressure over the melt with application to the fabrication of optical fibers by crucible methods. The channel diameter was 3.0, 4.2, and 4.5 mm, and the channel length was 120 mm. The temperature was varied from 285 to 320 ° C, and the excess pressure of the inert gas was up to 1.5 × 10 5 Pa. The results demonstrate that there is a threshold pressure for melt flow, suggesting that the melt is a viscoplastic fluid. The experimental data are interpreted in terms of the Shvedov-Bingham rheological model.

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