Thermodynamics
Polymorphism; Basic principles and characterization methods

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P1097 V2 Article

Thermodynamics
Polymorphism; Basic principles and characterization methods

Author : Michel BAUER

Publication date: November 10, 2022 | Lire en français

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4. Thermodynamics

From a thermodynamic point of view, every molecule should exist :

  • at the external pressure p considered ;

  • at the temperature T considered ;

  • in the crystalline form with the lowest Gibbs free enthalpy G, generally corresponding to the most compact stack (but there are a few exceptions).

The formula for calculating G is as follows:

G=HTS

with : :

H
 : 
enthalpy of the system (represents its total energy),
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