The dielectric functions of the intermetallic B2 phases NiA1, CoA1, and FeAl have been determined by difFerential reflectometry and the Kramers-Kronig analysis in the energy range of 1.2 -5 eV for various compositions near stoichiometry. The experimental absorption maxima are correlated to the band structure of these alloys taken from the literature. All transitions could be assigned to the band structure. The shift of absorption maxima could be explained by a shift of the Fermi level according to the Ekman rule for transitions involving the Fermi level, and for other transitions by small changes of the band-structure levels in the range of about 0.01 eV/at % Al.
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