Thermodynamic quantities frozen·in upon vitrification of metallic alloys

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Abstract
For a few glass-forming metallic systems whose specific heat is known for both the crystal and the liquid phase, together with the heat of fusion, the thermodynamic quantities trapped at the glass transition T g have been computed by extrapolation of the liquid data. The difference in enthalpy ΔH g is reasonably well approximated by the heat of crystallization, which is accessible to experiment. Attempts are made to express ΔS g and ΔG g as a function of ΔH g. On the basis of the observation that ΔC p is either linear with temperature or follows a formula recently proposed by Dubey and Ramachandrarao (1984), lower and upper limits are obtained. ΔS g is shown to be proportional to ln(T g/T 2), as found for conventional glass formers (T 2 is the temperature of vanishing excess entropy).