Measurement of the viscosity of chalcogenide glasses by a parallel plate technique

Abstract

The parallel plate technique of viscosity measurement in the range 10 6 to 10 8.5 P has been successfully applied to chalcogenide glasses. It offers a simple and quick alternative to traditional techniques such as fibre elongation.

Structural relaxation of As2Se3 glass and viscosity of supercooled liquid

“…Fig. 1 combines our viscosity results, data reported by Henderson and Ast [17] and Weber and Savage [18] for practically the same temperature region. All these data can be described by the Vogel-FulcherTamman equation…”

“…The temperature dependence of the viscosity for As 2 Se 3 supercooled liquid. The points represent data summarized in Table 1 (d), data reported by Henderson and Ast [17] (h) and Weber and Savage [18] (n). The solid line is best fit of Eq.…”

Viscosity of (GeSe2) (Sb2Se3)1− undercooled melts

“…The penetration method can be used to measure viscosity in the range of 10 7.5 -10 13.5 Pa s. The second method which was used was the parallelplate method [3]. This method is based on measuring the height of the sample which is squeezed between two fused silica plates.…”

“…In the case of materials that are not in thermodynamically stable state the viscosity influences two important processes that occur in these systems, crystallization and structural relaxation. Several studies of viscous behavior of Ge-Sb-Se undercooled melts are published elsewhere [1][2][3]. Systematic study of compositions belonging to pseudobinary line (GeSe 2 ) x (Sb 2 Se 3 ) 1Àx is the dominant subject of this paper.…”

Viscosity scaling of glass forming liquids on the basis of fragility

“…1a as a function of ð1=T r Þ 1=ð1ÀF Þ for 10 liquids whose viscosity-temperature behaviour is well-documented [4,[24][25][26][27][28][29][30][31][32]. Reduced viscosities seem to tend towards collapse, although the scatter is quite high (at places, as high as AE2.6 decades).…”