Viscosity of Glasses in the System As-Se and As-Se-X (X=I, S) in the Transition Region

Abstract

The viscosity of glasses in the systems As-Se and As-Se-X (X=I, S) was measured by the beam-bending method in the transition region ranging approximately from the transition temperature to the deformation temperature. The plots of the logarithm of the viscosity versus the reciprocal of the absolute temperature gave essentially straight lines for all samples. The apparent activation energy for the viscous flow of glass was calculated from the linear relation shown in Figs. 1, 2 and 3 by the equation ΔE=R d(logη)/d(1/T), where R is the gas constant. The results are shown in Figs. 5 and 6. Also the delayed elasticity becomes evident in the transition region for the glasses in the systems As-Se and As-Se-S, as shown in Figs. 8 and 9.