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AnXm binaries considered in this study. (a) Van Arkel–Ketelaar triangle with the considered MgnXm binaries plotted as a function of the mean electronegativity and the difference in the electronegativity of the two components. (b) Calculated activation energies for the migration of A = Li, Mg, Ca in AnXm binaries as a function of the migration number NmigrAX for various elements X according to eq 2. The solid lines correspond to linear regressions of these results.
