Some General Aspects of the Liquid-Glass Transition in Sodium Germanate Glasses

This paper is concerned with the temperature dependence of viscosity for sodium germanate glasses differing in sodium oxide content and discusses some aspects of the liquid-glass transition in them, including a kinetic glass transition criterion. Using parameters of the Williams-Landel-Ferry (WLF) equation, we have calculated the temperature range characterizing the glass transition region and the structure relaxation time at the glass transition temperature of the glassed studied. We propose generalization and substantiation of the Schmelzer kinetic glass transition criterion.