fig2

Figure 2. (A-C) Phase diagrams of three binary alloy systems. (A) Co-Ag immiscible system; (B) Co-Ni disordered alloy system; (C) Co-Pd ordered intermetallic compound system; (D) Schematic of the influence of different enthalpy and entropy on Gibbs free energy; (E) Phase diagram and critical transition temperature of typical ordered intermetallic compounds; (F) Comparison of free energies between disordered alloys and ordered intermetallic compounds under A_xB_y stoichiometry in different temperatures.