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Evolution under thermal annealing of Mn-doped iron disilicides obtained by ball milling

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Abstract

Phase formation in the Mn doped \(\upbeta \)-FeSi2 system (Fe1 − x Mn x Si2, with 0.00 ≤ x ≤ 0.24) was studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the simultaneous mill of pure Si, Mn and Fe under Ar atmosphere followed by an annealing at 1,123 K during 4 h at 1 × 10 − 7 Torr. After milling, an admixture of \(\upbeta \)-FeSi2, \(\upalpha \)-FeSi2 and \(\upvarepsilon \)-FeSi phases was present while \(\upalpha \)-FeSi2 disappeared after annealing, resulting \(\upbeta \)-FeSi2 the main phase. Depending on Mn concentration, small amounts of \(\upvarepsilon \)-FeSi and Si segregation were also observed. A preferential substitution of Fe atoms by Mn ones in the FeII site of the \(\upbeta \)-FeSi2 regular lattice was inferred from the Mössbauer results.

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Authors and Affiliations

  1. Departamento de Física, Facultad de Ciencias Exactas, UNLP, C. C. No. 67, 1900, La Plata, Argentina

    J. Martínez, J. Runco, S. M. Cotes, M. A. Taylor & J. Desimoni

  2. IFLP-CONICET, 49 y 115, 1900, La Plata, Argentina

    J. Martínez, S. M. Cotes, M. A. Taylor & J. Desimoni

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  1. J. Martínez
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  2. J. Runco
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  3. S. M. Cotes
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  4. M. A. Taylor
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  5. J. Desimoni
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Correspondence to J. Martínez.

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Martínez, J., Runco, J., Cotes, S.M. et al. Evolution under thermal annealing of Mn-doped iron disilicides obtained by ball milling. Hyperfine Interact 178, 13–17 (2007). https://doi.org/10.1007/s10751-008-9649-1

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  • DOI: https://doi.org/10.1007/s10751-008-9649-1

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