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The Study of the Formation of Pt8Cr in the Platinum-rich Portion of the Pt-Cr Binary System

The platinum-rich end of the platinum-chromium binary system is reported to be a single-phase solid solution with atomic ordering observed only in alloys containing from 20 to 65 at.% chromium [1]. This was revealed by existence of superlattice line in X-ray diffraction patterns. At stoichiometric composition Pt3Cr, a Cu3Au L12 type structure was observed[2,3]. For the equiatomic PtCr a CuAu L10 type was observed. For the other compositions within the ordered region, a continuous variation in site occupancies was observed such that the structure changes progressively from the L12 type to the L10 with increasing chromium content.