3d遷移金属を含む貴金属合金Au-Crの局所構造と磁性

抄録

The intensity of X-ray diffuse scattering was measured at room temperature for fcc Au-Cr alloys whose compositions are 20. and 8.4 at.% Cr. Diffuse maxima due to atomic short-range order (ASRO) were observed at the 11/20 and its equivalent positions for the three specimens, while their intensities decrease with decreasing Cr content. From computer-simulated arrangements of Cr atoms in an fcc lattice, based on the observed ASRO parameters, the Cr atoms were found to have a preference for lining up along‹100› directions for the Au-20.2 at.% Cr alloy. On the other hand, the Cr atoms tend to have random positions for the Au-8.4 at.% Cr alloy and have an intermediate arrangement for the Au-12.6 at.% Cr alloy. The relationship bet ween the ASRO state and t he magnet is propert y in fcc Au-Cr alloys is discussed