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The Debye temperature of the Fe–Cr sigma-phase alloys

2005; IOP Publishing; Volume: 17; Issue: 43 Linguagem: Inglês

10.1088/0953-8984/17/43/008

1361-648X

J. Cieślak, B. F. O. Costa, S.M. Dubiel, M. Reissner, Walter Steiner,

Advanced Materials Characterization Techniques

57Fe Mössbauer spectra were recorded for microcrystalline and nanocrystalline samples of the σ-phase of Fe100−xCrx alloys with x between 44.6 and 49.6 in the temperature range between 4.3 and 300 K. From the temperature dependence of the average centre shift derived from the spectra measured between 80 K and 300 K, Debye temperatures, θD, were determined. θD-values for the two types of sample show the same linear increase with x, namely ∼15 K/at.%, which is faster than a similar trend observed for the α-phase Fe–Cr alloys.