A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy
A. Hanc a, J. Kansy a, G. Dercz a, L. Pająk a , D. Oleszak b, and J. Mrzigod c a Institute of Materials Science, Silesian University, Bankowa 12, 40-007 Katowice, Poland b Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw, Poland c Institute of Chemistry, Silesian University, Szkolna 9, 40-007 Katowice, Poland
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Received: 08 06 2008
In this work, we employed the Mössbauer spectroscopy and X-ray powder diffraction in a study of point defect formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. We present the values of the 57Fe isomer shift and quadrupole splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results showed that an increase in Al content causes an increase in vacancy and Fe-AS concentration.
DOI: 10.12693/APhysPolA.114.1555
PACS numbers: 75.50.Bb, 61.72.J-, 76.80.+y