fig3

Figure 3. Formed phases for two representative alloys of Pt₈₂Al₁₂Cr₆ and Pt₈₂Al₁₂Hf₆ at 1,300 °C as a function of the partial pressure of O₂ gas ($$ P_{\mathrm{O}_{2}} $$), where the input of each alloy is 1 mole and the gas phase is fixed but with zero amount during thermodynamic calculations. Here, we do not distinguish the fcc phase and the L1₂ phase, which were modeled by the same sublattice model^[20].