Abstract
Stoichiometric intermetallic alloys of NiAl and FeAl were quenched from temperatures up to 1100°C in order to produce thermal defects. The influence of this treatment to the optical properties was investigated by differential reflectometry (DR). The results could be interpreted by the assignment of the optical absorptions to the electronic structure. No additional transitions (localized states) were found. A formation enthalpy of 1.04 eV for the vacancies was obtained from the optical measurements and an electron transfer of 0.5 electrons/vacancy was concluded from the comparison of optical measurements with thermal defects and so-called structural defects, induced by a change of composition.
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