Abstract
Abstract The phase equilibria at 600°C of the ternary system Y–Cu–Pd in the range 0–25 at.% Y have been investigated by means of X-ray powder diffraction and microscopic analyses. Three ternary compounds were found to occur: YCu 1.20 Pd 1.80 , YCu 2–1.75 Pd 1–1.25 and YCu 3.77 Pd 1.23 . The crystal structure was determined for two compounds: YCu 1.20 Pd 1.80 has the TiNi 3 structure type, sp. gr. P6 3 /mmc, a =5.732(1), c =9.383(2) A, YCu 3.77 Pd 1.23 has the AuBe 5 str. type, sp. gr. F43m, a =7.078(2) A. The Cu and Pd atoms randomly occupy crystallographic sites in both structures. The electrical resistivity of the ternary compounds is of the metal type and obeys the Bloch–Gruneisen function within the temperature range 4.2–300 K. None of the ternary compounds of the system superconduct above 4.2 K. The traces of superconductivity observed in some alloys are suggested to arise from an unresolved quaternary compound.
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