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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.22: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Interactions in Fe-Pd — •Cédric Sax and Bernd Schönfeld — LMPT, Department of Materials, ETH Zurich
X-ray diffuse scattering was measured from single-crystalline Fe-80 at.% Pd. A state of thermal equilibrium - corresponding to 1073 K - was investigated at room temperature. Maxima of diffuse scattering were found at X positions. Short-range order scattering was separated by the Georgopoulos-Cohen technique and effective pair interaction (EPI) parameters were determined by the inverse Monte Carlo method. In contrast to the set of EPI parameters that were obtained by Mehaddene et al. for Fe-50 at.% Pd, a dominant and positive value for the nearest-neighbor interaction is now found. This outcome indicates a stronger ordering tendency for Fe-Pd with a higher Pd fraction. Using linear interpolation between the EPI parameters at both compositions, shifts in the highest order-disorder transition temperatures of the L10 and L12 phases away from stoichiometry are obtained. Direct experiments confirm these findings.