Abstract
Positron lifetime spectroscopy and shape analysis of the Doppler broadened positron annihilation peak were performed on iron aluminides containing 28 at.%, 40 at.% and 50 at.% Al. The electronic structure of the open volume defects, probably double vacancies, as seen by positron spectroscopy was independent of the heat treatment. Slight increases of the average positron lifetime as a function of quenching temperature indicate densities of double vacancies sufficiently high to cause the positron wavefunction to overlap with more than one defect. Positron lifetimes corresponding to trapping of vacancy-type defects increased with aluminium content. Changes in the shape of the annihilation peak suggest that the addition of aluminium causes a chemical shift of the iron 3d electrons to lower momenta.
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