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In the present work Fe-Al-X (X=Cu;Ni;Cr) metallic powders produced by the self-decomposition method of Fe-Al doped alloys were examined by Mıssbauer spectroscopy. The concentration of Fe vacancies and Fe atoms substituting for Al (Fe-AS) was determined from the intensities of the sub-spectra in the Mıssbauer analysis connected with distinct Fe environments. The results show that nickel and copper produce an increase of the vacancy concentration in comparison with the values found for Fe-Al metallic powders, whereas chromium decreases the vacancy concentration, causing a significant increase of the anti-site atom Fe-AS concentration.

Point defect structure and 57Fe hyperfine parameters of Fe-Al powders doped with Ni, Cu and Cr additions