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Anomalous behavior of the Debye temperature in Fe-rich Fe-Cr alloys

Authors: B.F.O. Costa, J. Cieslak, S.M. Dubiel

Ref.: J. Alloys and Compounds 492, L1-L4 (2010)

Abstract: Debye temperature, Theta(D), of Fe-rich Fe(100-x)Cr(x), disordered alloys with 0 <= x <= 30 was determined from the temperature dependence of the centre shift of Mossbauer spectra recorded in the temperature range of 60-300 K. Its compositional dependence shows a non-monotonous behaviour with two maxima: a sharp maximum at x approximate to 3 having a relative increase of similar to 12% compared to a pure iron, and a broad one centred at x approximate to 15 with a relative height of similar to 10%. The maxima coincide well with those found or calculated for various physical properties like the spin-waves stiffness coefficient, D(o), the magnetic moment per Fe atom and the Curie temperature, suggesting a magnetic origin as a possible source of the anomalous behaviour of Theta(D) observed in this study. (C) 2009 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.jallcom.2009.11.067