513.001 Molecular and Solid State Physics

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Physical
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Periodic System
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Ibach and Lüth, 1.5

Take the CsCl structure and assume that the cation radius becomes smaller while the anion radius remains constant. What happens to the binding energy? Show that for small cations the NaCl lattice becomes the preferred structure. For an even smaller cation radius the ZnS lattice has the largest binding energy (Madelung constant A = 1.638).