Modification of compounds in the gas phase
Phase equilibria of pure mineral bodies

In the tables below, you'll find a number of special features referenced at the end of the article. Among the most frequently cited features are modifications of compounds in the gas phase and the intervention of the sublimation process.

The phenomenon of sublimation occurs when the imposed pressure is lower than the pressure of the triple point of the pure body (see figure 6, Table ). In this case, the phase transition leads to the gas phase. However, under certain experimental conditions, the formation of liquid can sometimes be observed during isobaric heating of the solid. This liquid is said to be metastable, as it corresponds to a phase that is thermodynamically less stable than steam. A slight mechanical or thermal disturbance of the system produces steam, which has a lower chemical potential than liquid under these temperature and pressure...