Viscosity of (GeS2) (Sb2S3)1− supercooled melts

Abstract Viscosity of (GeS 2 ) x (Sb 2 S 3 ) 1− x melts ( x = 0.1–0.9) has been measured by penetration method and parallel-plate method as a function of temperature. The temperature dependence of viscosity can be expressed by a simple equation of Arrhenius type. The kinetic fragility obtained from these plots varies linearly with composition. The Sb 2 S 3 component probably affects the network structure and, consequently, the kinetic fragility of a supercooled melt increases. As expected, the heat capacity change at the glass transition, Δ C p , exhibits similar (though non-linear) compositional dependence.