Liquid-Supercooled Liquid And Super Cooled Liquid-Disordered Solid State Transition In Glass-Forming Systems

In present approaches for describing the temperature dependences of physical-chemical properties of glass forming system, the existence of any special temperatures at which the principal changes of the structural character occur is not proposed. The discontinuities of the heat capacity, the isothermal compressibility, and the thermal expansion coefficient, observed at the glass transition temperature are due to the kinetic nature of the glass transition. Thus it is supposed that, at the transition of a liquid to the supercooled liquid state, no qualitative changes occur in the structural state. At the glass transition, the supercooled liquid transforms to a thermodynamically unstable state.