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The phase diagram of the Nd–Pt system from 35 to 85 at%Pt has been revised using X-ray diffraction and differential thermal analysis. It is found that the Nd3Pt4 phase with the rhombohedral Pd4Pu3 structure type is unstable and decomposes into the two neighboring phases NdPt and NdPt2 at temperatures ranging approximately from 583 to 1123 K. It is confirmed that the homogeneity range for the Laves phase NdPt2 extends from about 68.5 to 75.3 at%Pt in the Nd–Pt binary system. The polymorphic transformation temperature of α-NdPt ⇌ β-NdPt is about 623 K, where the α-NdPt phase with BFe type is stable at low temperatures and the β-NdPt phase with BCr type at high temperatures.

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