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

Viscosity of (GeS2)x(Sb2S3)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 Sb2S3 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, ΔCp, exhibits similar (though non-linear) compositional dependence.