A simple tight-binding model is used for a quantitative study of hybridisation effects in nickel-aluminium compounds. The model is not an ab initio calculation but it requires only the data on elemental properties of pure metal constituents which are readily available in the literature. Combined with an extended Cluster Bethe Lattice Method, this approach allows the energy of formation of these compounds to be calculated and the chemical trends in the bonding properties to be analysed.
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