where i denotes the different metal atoms in the bulk unit cell (Pt, Ag). The resulting bulk formation energies are plotted as orange bars in Fig. and listed in Table . Most important finding is that all formation energies Ef,bulk are positive, i.e., the formation of the bimetallic bulk units cells with atoms from the respective reservoirs costs energy. Hence, for these specific systems phase separation into Ag and Pt would be more favorable.