Abstract
We review the theoretical work concerning the effects of non-stoichiometry on the electronic spectra of transition metal hydrides. The treatment of these effects generally falls outside the scope of the conventional Bloch band theory. However, the recently developed techniques of band theory of random alloys can be applied to this problems by modelling the metal-hydrogen system as an “alloy” of hydrogen atoms and vacancies. This approach involves the use of the average t-matrix (ATA) and coherent potential (CPA) approximations within the Korringa-Kohn-Rostoker framework. We discuss the premises underlying such a scheme and the progress that has been possible on this basis in understanding the metal-hydrogen system.
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