4. Thermodynamic measurement of physical stability, the driving force behind crystallization
At a given pressure P, a crystal melts at temperature T m . The possible existence, below T m , of both states, crystalline or subcooled liquid (which is amorphous), raises the question of the relative stability of these states. For transformations occurring at a given temperature T and pressure P, the stability of a state is measured by the Gibbs free energy G, also called free enthalpy. G is defined by :
The differential form of G (T, P) as T and P vary is given by :
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Thermodynamic measurement of physical stability, the driving force behind crystallization
Crystallization kinetics – Glass formation and stability
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