Influence of Fermi energy equalization on crystal nucleation in glass melts

摘要

The energy saving produced by the equalization of Fermi energies of a crystal and a melt has been associated to the crystal formation in undercooled melts to determine the new homogeneous-nucleation critical-temperature T_2 and the new nucleation critical barrier as a function of the temperature T. Small unmelted clusters act as nuclei by reducing the critical energy barrier and the nucleation times; the glass transition temperature T_g occurs near T= T_2. The temperature dependence of the specific heat difference of the undercooled melt with the glass, the viscosity weakening below T_g and the nose of the temperature-time-transformation diagrams are successfully predicted.