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Figure 4
Phase diagram of Na–Pb calculated using DFT showing the formation energies of compounds with already known structures (red squares) and those solved in this work (blue circles). The solid line indicates the convex hull for this system. The dashed line represents the convex hull before introducing the compounds solved in this work. The region highlighted by the inset is shown in black dashed lines. All three of the structures that were solved in this work were found to be either stable (i.e. on the solid black line) or close to it, which suggests they are energetically feasible.

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