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

B. F. O. Costa; J. Cieslak; S. M. Dubiel

doi:10.1016/j.jallcom.2009.11.067

paper

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

arXiv:0810.0123 · doi:10.1016/j.jallcom.2009.11.067

Abstract

Debye temperature, $Θ_{D}$ , of Fe-rich Fe $_{100 - x}$ Cr $_{x}$ disordered alloys with $0 \leq x \leq 22.3$ was determined from the temperature dependence of the central shift of Mössbauer spectra recorded in the temperature range of 60 -- 300 K. Its compositional dependence shows a maximum at $x \approx 5$ with a relative increase of $\sim 30$ % compared to a pure iron. The composition at which the effect occurs correlates well with that at which several other quantities, e. g. the Curie temperature and the spin-wave stiffness coefficient, $D_{0}$ , show their maxima, but the enhancement of $Θ_{D}$ is significantly greater and comparable with the enhancement of the hyperfine field (spin-density of itinerant $s$ -like electrons) in the studied system. The results suggest that the electron-phonon interaction is important in this alloy system.

References in corpus (1)

Relationship between the magnetic hyperfine field and the magnetic moment