Abstract

Neutron diffraction in combination with isotopic substitution on the zero-scatterer 62Ni43 63Cu57 shows indications for chemical short-range order in the stable liquid as evidenced by oscillations in the concentration–concentration structure factor S CC(q). This points towards a non-ideal solution behavior of Ni–Cu contrary to common believe but in agreement with measurements of free enthalpy of mixing. The temperature dependence of S CC at small momentum transfer provides evidence of critical compositional fluctuations in Ni43Cu57 melts.

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