Abstract
Atomic ordering in the copper-platinum alloy system has been studied by X-ray diffraction using single crystals with compositions of Cu-48, 54, 61, 66 and 70 at%Pt. At the composition near the equiatomic one, an ordered structure CuPt, first found by Johansson and Linde, has been confirmed. A negative result has been obtained for the existence of an ordered structure Cu3Pt5, which was proposed by Linde. An ordered structure formed at the composition near CuPt3 has been shown to be consistent with the structure model of Tang rather than that of Schneider and Esch.
