Consider an allotropic transition between two phases in a pure substance. The phases are said to be in equilibrium when they have identical free energies. Pure ice and water coexist at precisely 273.15 K (0 °C) and 1 atm of pressure. When this system consists of a mixture of common salt and H2O, the ice and water become solid and liquid solutions, respectively, but can still coexist in equilibrium, albeit under different circumstances...........
Metallurgical and Materials Transactions A, 41A (2010) 1605-1615.
Download PDF file of paper, with permission from TMS International
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