In 55-atom sodium-potassium alloy clusters, surface atoms bind their electrons more tightly than interior atoms, and the size of the shift tracks composition.
1 shows the global minimum structures of the Na xK55–x alloy nanoclusters; in the figure, purple spheres indicate Na atoms and light blue spheres are K atoms
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DFT-based energy shifts screening of Na$_x$K$_{55-x}$ alloy clusters
In 55-atom sodium-potassium alloy clusters, surface atoms bind their electrons more tightly than interior atoms, and the size of the shift tracks composition.