Size-dependent solution phase diagrams for binary systems are established based on models of size-dependent melting temperature and melting enthalpy of components and a newly developed model for the size-dependent interaction energy. The results show that as the size of the components decreases, the temperatures of solidus and liquidus curves drop and the two-phase zone becomes small. As the size of the components decreases to a critical size, the two-phase zone deteriorates into a curve where the liquid phase and the solid phase are indistinguishable in structure and thus the phase numbers transform from two to one.
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