Entropy liquid versus crystal

Figure 4.29 Changes in volume or entropy which can occur on cooling a liquid. Crystallization may occur at Tj- or, if the liquid is supercooled below jy, a glass is formed. The temperature corresponding to the break in slopes of V(oi S) versus T is termed the glass transition temperature, T. The value of varies with the cooling rate, R(Ri > f 2)-...

Fig. 20. Two examples of the vanishing excess entropy paradox. The area representing the entropy of fusion on the CJ, versus T (log scale) plot has been matched to the area between the crystal and supercooled Uquid heat capacity curves (the latter being extrapolated naturally below the Tg to indicate the supercooled liquid Cg for very slow (equiUbrium) measurements. At the temperature T, S (supercooled liquid) would equal as can be...

Scaled excess entropy versus Tg-scaled inverse temperature. The excess entropy corresponds to the entropy of the liquid minus that of the corresponding crystal, and it is scaled by the value of excess entropy at Tg so that all curves converge at Tg. (Reproduced from [21].]... 

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