Mössbauer spectroscopic study of order–disorder phenomena in Fe3−xMnxSi
| Autor: | G. Alna'Washi, A. S. Saleh, Abdel-Fatah D. Lehlooh, Sami H. Mahmood |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Mössbauer effect Annealing (metallurgy) Alloy engineering.material Condensed Matter Physics Molecular physics Spectral line Electronic Optical and Magnetic Materials Nuclear magnetic resonance Mössbauer spectroscopy engineering High field Electrical and Electronic Engineering Ball mill Hyperfine structure |
| Zdroj: | Physica B: Condensed Matter. 321:167-172 |
| ISSN: | 0921-4526 |
| Popis: | In this work we report the results of Mossbauer study of the order–disorder problem in the alloy system Fe3−xMnxSi for x=0, 0.1, 0.25 and 0.5. For this purpose, sets of “as-prepared”, “annealed”, and “ball-milled” samples were investigated. All spectra consist of magnetically split components. In the ordered state, the spectra for Fe3Si show two sharp peaks: a low field component associated with Fe atoms at the A, C sites of the D03 structure, and a high field component associated with Fe atoms at the B site. As Mn is substituted for Fe in the alloy, the low field component splits into a number of sextets separated by about 40–45 kOe, consistent with the fact that Mn atoms replace Fe atoms in the B site preferentially. The high field component degenerates into broad components at lower fields indicating atomic disorder resulting from the movement of Si atoms to the A, C sites. The study also shows that no appreciable difference is observed between the as-prepared and annealed samples. However, in the ball-milled samples a high degree of disorder is induced, and the distribution of hyperfine fields is calculated using a theoretical model based on the binomial distribution. |
| Databáze: | OpenAIRE |
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