Figure 2 | Scientific Reports

Figure 2

From: Ceramic transition metal diboride superlattices with improved ductility and fracture toughness screened by ab initio calculations

Figure 2

Formation energy, \(E_f\), of metal diborides, MB\(_2\), in the \(\alpha\) and \(\omega\) phase, grouped by the valence electron concentration of the metal atom, VEC(M). The grey-shaded region marks the threshold of our selection-criterion (0.25 eV/at.) of diboride-layer constituents. Phases outside the grey region are considered too unlikely to form and therefore discarded. Note that Al is not adjacent to the remaining M elements in the periodic table and has no d electrons.

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