Abstract
Measurements of the thermodynamic and kinetic properties in the fully relazed undercooled liquid regime near the glass transition temperature of AuPbSb alloys show that the measured glass transition temperature extrapolated to zero heating rate corresponds to the isentropic (Kauzmann) temperature T go. The slowing down of relaxation processes around the ideal glass transition temperature as well as the temperature dependence of the viscosity can be described by a Vogel-Fulcher law with the same critical temperature, the Kauzmann temperature. The experimental results suggest that for AuPbSb alloys the glassy state can be approached as a truly metastable state with an activation barrier of about 0.02 eV, in comparison with 1.5 eV for crystallization, suggesting a second-order phase transition with an underlying critical point as predicted by scaling theories.
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