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Mössbauer studies of a-Fe74Co10−xCrxB16 alloys

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Abstract

Fe57 Mössbauer spectroscopy has been employed to study hyperfine interactions in melt-spun a-Fe74Co10−x Cr x B16 (x = 0, 2.5, 5, 7.5 and 10) ribbons. The Curie temperature and the effective hyperfine fields observed for the spectra at 80 K show a systematic fall with increasing chromium content. Increasing chromium content also brings about a change in the orientation of the magnetization axis in that it comes closer to the direction of γ-ray propagation. The temperature dependence of hyperfine fields in a-Fe74Co5Cr5B16 alloy is accounted for using the existing theoretical models. The field distribution curves show a temperature dependence, while the e.f.g. distribution evaluated from the paramagnetic doublet spectra aboveT c are temperature independent. The spin-wave coefficients B (B3/2) and C (C5/2) and the critical exponent, β, were determined and their significances explained.

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Authors and Affiliations

  1. School of Chemistry, University of Hyderabad, 500 134, Hyderabad, India

    T. G. Narendrababu & R. Jagannathan

  2. Defence Metallurgical Research Laboratory, 500 258, Hyderabad, India

    V. N. Murthy, D. Akhtar & P. Subrahmaniam

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  1. T. G. Narendrababu
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  2. R. Jagannathan
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  3. V. N. Murthy
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  4. D. Akhtar
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  5. P. Subrahmaniam
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Narendrababu, T.G., Jagannathan, R., Murthy, V.N. et al. Mössbauer studies of a-Fe74Co10−xCrxB16 alloys. J Mater Sci 25, 3314–3320 (1990). https://doi.org/10.1007/BF00587692

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