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Abstract
Abstract
The chemical binding energy associated with indirect interactions between hydrogen interstitials in f.c.c. ferromagnetic nickel has been calculated. A double extra-orbital tight-binding model Hamiltonian (TBMH) is used to include the additional hydrogen orbitals in terms of the well known single extra-orbital tight-binding Hamiltonian. An s-like orbital for the interstitial, in addition to s, p and d metallic orbitals, are considered. A repulsive interaction is obtained between hydrogen interstitials in octahedral locations for the first-, second- and third-nearest-neighbour positions.