Debye temperature of disordered bcc-Fe-Cr alloys

Details Debye temperature of disordered bcc-Fe-Cr alloys Debye temperature of disordered bcc-Fe-Cr alloys

2009-10-14

arxiv.org/abs/0910.2544v1

J. Phys.: Condens. Matter 22 (2010) 055402

Physics

Condensed Matter

Materials Science

15 pages, 7 figures, 26 references

Scientific paper

10.1088/0953-8984/22/5/055402

Debye temperature, TD, of Fe100-xCrx disordered alloys with 0~95 the Debye temperature is smaller than the one for the metallic iron, with a local minimum at x=~55 at which the relative decrease of TD amounts to ~12%. The first maximum coincides quite well with that found for the spin-waves stiffness coefficient, D0, while the pretty steep decrease observed for x>~95 which is indicative of a decoupling of the probe Fe atoms from the underlying chromium matrix is likely related to the spin-density waves which constitute the magnetic structure of chromium in that interval of composition. The harmonic force constant calculated from the Debye temperature of the least Fe-concentrated alloy (x>99.9) amounts to only 23% of the one characteristic of a pure chromium.

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